Pub Date : 2026-03-15Epub Date: 2026-01-20DOI: 10.1016/j.jelechem.2026.119844
Yi Zhang , Hongcheng Xu , Churen Wang , Ziqiang Li , Gongyuan Zhao , Dengfeng Yu , Chunxia Chen
Aqueous zinc‑iodine batteries (AZIBs) stand out as promising next-generation energy storage devices due to their cost-effectiveness and intrinsic safety. However, their practical application is severely hindered by sluggish iodine conversion kinetics, the shuttling effect of polyiodides, and limited achievable iodine mass loading (typically <2 mg cm−2). To address these challenges, this work reports a novel modified separator (denoted as BN-rGO@GF) fabricated by coating a glass fiber GF substrate with a porous boron nitride-reduced graphene oxide (BN-rGO) composite. The BN-rGO layer endows the separator with dual physical adsorption and chemical catalytic capabilities: it effectively immobilizes soluble polyiodides to suppress the shuttle effect while accelerating the redox conversion kinetics of iodine species. Consequently, the AZIBs utilizing BN-rGO@GF as the separator deliver an ultrahigh discharge capacity (208.7 mAh g−1 at a current density of 0.1 A g−1) and maintain an excellent capacity retention rate of up to 85% over 2600 cycles. Notably, an outstanding capacity of 141.9 mAh g−1 is achieved even at an ultrahigh mass loading of 15 mg cm−2, demonstrating remarkable potential for practical application. This work provides an effective design strategy for modified separators and offers new insights into advancing high-performance AZIBs.
水性锌碘电池（azib）因其成本效益和内在安全性而成为有前途的下一代储能设备。然而，它们的实际应用受到碘转化动力学缓慢、多碘化物的穿梭效应和可实现的碘质量负载有限（通常为2mg cm - 2）的严重阻碍。为了解决这些挑战，本研究报告了一种新型改性分离器（表示为BN-rGO@GF），该分离器通过在玻璃纤维GF衬底上涂覆多孔氮化硼还原氧化石墨烯（BN-rGO）复合材料制成。BN-rGO层赋予了分离器双重物理吸附和化学催化能力：它有效地固定了可溶性多碘化物，抑制了穿梭效应，同时加速了碘种的氧化还原转化动力学。因此，利用BN-rGO@GF作为分离器的azib提供了超高的放电容量（在0.1 a g−1的电流密度下为208.7 mAh g−1），并且在2600次循环中保持了高达85%的优异容量保持率。值得注意的是，即使在15 mg cm - 2的超高质量负载下，也能达到141.9 mAh g - 1的出色容量，显示出显着的实际应用潜力。这项工作为改进分离器提供了有效的设计策略，并为推进高性能azib提供了新的见解。
{"title":"A BN-rGO modified separator enabling synergistic shuttle suppression toward high-mass-loading aqueous zinc‑iodine batteries","authors":"Yi Zhang , Hongcheng Xu , Churen Wang , Ziqiang Li , Gongyuan Zhao , Dengfeng Yu , Chunxia Chen","doi":"10.1016/j.jelechem.2026.119844","DOIUrl":"10.1016/j.jelechem.2026.119844","url":null,"abstract":"<div><div>Aqueous zinc‑iodine batteries (AZIBs) stand out as promising next-generation energy storage devices due to their cost-effectiveness and intrinsic safety. However, their practical application is severely hindered by sluggish iodine conversion kinetics, the shuttling effect of polyiodides, and limited achievable iodine mass loading (typically <2 mg cm<sup>−2</sup>). To address these challenges, this work reports a novel modified separator (denoted as BN-rGO@GF) fabricated by coating a glass fiber GF substrate with a porous boron nitride-reduced graphene oxide (BN-rGO) composite. The BN-rGO layer endows the separator with dual physical adsorption and chemical catalytic capabilities: it effectively immobilizes soluble polyiodides to suppress the shuttle effect while accelerating the redox conversion kinetics of iodine species. Consequently, the AZIBs utilizing BN-rGO@GF as the separator deliver an ultrahigh discharge capacity (208.7 mAh g<sup>−1</sup> at a current density of 0.1 A g<sup>−1</sup>) and maintain an excellent capacity retention rate of up to 85% over 2600 cycles. Notably, an outstanding capacity of 141.9 mAh g<sup>−1</sup> is achieved even at an ultrahigh mass loading of 15 mg cm<sup>−2</sup>, demonstrating remarkable potential for practical application. This work provides an effective design strategy for modified separators and offers new insights into advancing high-performance AZIBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119844"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-01-14DOI: 10.1016/j.jelechem.2026.119832
Wenhui Zhang , Rong Zhong , Jiake Li , Hedong Jiang , Xin Liu , Pingchun Guo , Hua Zhu , Yanxiang Wang
Aqueous zinc-ion batteries (AZIBs) have emerged as a leading option in energy storage devices. However, issues such as the solvation structure of [Zn (H2O) 6]2+, water-rich interfaces, and interface instability have led to hydrogen evolution reactions (HER), corrosion, and dendrite growth, hindering their application and development. In this paper, the conventional ZnSO4 electrolyte was modified using 3-aminopropionitrile fumarate (3-Af) as an additive. Experimental and theoretical calculation results indicate that the carboxyl groups in 3-Af strongly interact with H2O, accelerating the desolvation process of Zn2+ and reducing the occurrence of active water decomposition. Additionally, 3-Af adsorbed onto the zinc anode surface forms a stable interface layer and regulates Zn2+ flux to achieve uniform deposition, thereby effectively inhibiting dendrite formation. Under the synergistic mechanism, the Zn//Zn symmetric battery assembled with the 3-Af-containing electrolyte (10 mM) exhibits the stable cycling for 2540 h and 810 h at current densities of 1.0 mA cm−2 and 5.0 mA cm−2, respectively, which are 22 and 30 times than those of the Zn//Zn symmetric battery with ZnSO4 electrolyte, respectively. The Zn//Ti asymmetric battery with the 3-Af-containing electrolyte (10 mM) has the stable cycling 670 cycles at 1.0 mA cm−2, which is nearly 30 times higher than that with ZnSO4 electrolyte. The Zn//I₂ battery with the 3-Af-containing electrolyte (10 mM) achieves a specific capacity of 172.8 mAh g−1 at a current density of 0.2 A g−1, whereas the specific capacity is 140.0 mAh g−1with ZnSO4 electrolyte. Moreover, the Zn//I₂ battery with the 3-Af-containing electrolyte (10 mM) shows the specific capacity rate of 77.1% after 10,000 cycles at 5.0 mA cm−2, which increases by 17.8% than that with ZnSO4 electrolyte. Therefore, this work paves a new way for the development of low-cost and long-life AZIBs.
水锌离子电池（azib）已成为能源存储设备的主要选择。然而，[Zn (H2O) 6]2+的溶剂化结构、富水界面和界面不稳定性等问题导致了析氢反应（HER）、腐蚀和枝晶生长，阻碍了它们的应用和发展。本文以富马酸3-氨基丙腈（3-Af）为添加剂对传统的ZnSO4电解质进行了改性。实验和理论计算结果表明，3-Af中的羧基与H2O发生强烈的相互作用，加速了Zn2+的脱溶过程，减少了活性水分解的发生。另外，吸附在锌阳极表面的3-Af形成稳定的界面层，调节Zn2+通量，实现均匀沉积，从而有效抑制枝晶的形成。在协同作用下，含3- af电解质（10 mM）组装的Zn//Zn对称电池在电流密度分别为1.0 mA cm - 2和5.0 mA cm - 2时的稳定循环时间分别为2540 h和810 h，是含ZnSO4电解质的Zn//Zn对称电池的22倍和30倍。含3- af电解质（10 mM）的Zn/ Ti不对称电池在1.0 mA cm−2下稳定循环670次，比含ZnSO4电解质的电池高近30倍。在0.2 a g−1电流密度下，含3- af （10 mM）电解液的Zn//I₂电池的比容量为172.8 mAh g−1，而含ZnSO4电解液的比容量为140.0 mAh g−1。在5.0 mA cm−2下，含3- af （10 mM）电解质的Zn//I₂电池在10000次循环后的比容量率为77.1%，比含ZnSO4电解质的电池提高了17.8%。因此，本研究为低成本、长寿命azib的开发开辟了一条新的道路。
{"title":"Ultralong-life zinc-ion batteries enabled by a multifunctional aqueous electrolyte additive","authors":"Wenhui Zhang , Rong Zhong , Jiake Li , Hedong Jiang , Xin Liu , Pingchun Guo , Hua Zhu , Yanxiang Wang","doi":"10.1016/j.jelechem.2026.119832","DOIUrl":"10.1016/j.jelechem.2026.119832","url":null,"abstract":"<div><div>Aqueous zinc-ion batteries (AZIBs) have emerged as a leading option in energy storage devices. However, issues such as the solvation structure of [Zn (H<sub>2</sub>O) <sub>6</sub>]<sup>2+</sup>, water-rich interfaces, and interface instability have led to hydrogen evolution reactions (HER), corrosion, and dendrite growth, hindering their application and development. In this paper, the conventional ZnSO<sub>4</sub> electrolyte was modified using 3-aminopropionitrile fumarate (3-Af) as an additive. Experimental and theoretical calculation results indicate that the carboxyl groups in 3-Af strongly interact with H<sub>2</sub>O, accelerating the desolvation process of Zn<sup>2+</sup> and reducing the occurrence of active water decomposition. Additionally, 3-Af adsorbed onto the zinc anode surface forms a stable interface layer and regulates Zn<sup>2+</sup> flux to achieve uniform deposition, thereby effectively inhibiting dendrite formation. Under the synergistic mechanism, the Zn//Zn symmetric battery assembled with the 3-Af-containing electrolyte (10 mM) exhibits the stable cycling for 2540 h and 810 h at current densities of 1.0 mA cm<sup>−2</sup> and 5.0 mA cm<sup>−2</sup>, respectively, which are 22 and 30 times than those of the Zn//Zn symmetric battery with ZnSO<sub>4</sub> electrolyte, respectively. The Zn//Ti asymmetric battery with the 3-Af-containing electrolyte (10 mM) has the stable cycling 670 cycles at 1.0 mA cm<sup>−2</sup>, which is nearly 30 times higher than that with ZnSO<sub>4</sub> electrolyte. The Zn//I₂ battery with the 3-Af-containing electrolyte (10 mM) achieves a specific capacity of 172.8 mAh g<sup>−1</sup> at a current density of 0.2 A g<sup>−1</sup>, whereas the specific capacity is 140.0 mAh g<sup>−1</sup>with ZnSO<sub>4</sub> electrolyte. Moreover, the Zn//I₂ battery with the 3-Af-containing electrolyte (10 mM) shows the specific capacity rate of 77.1% after 10,000 cycles at 5.0 mA cm<sup>−2</sup>, which increases by 17.8% than that with ZnSO<sub>4</sub> electrolyte. Therefore, this work paves a new way for the development of low-cost and long-life AZIBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119832"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-01-22DOI: 10.1016/j.jelechem.2026.119872
Vita N. Nikitina , Vladislav M. Pleshakov , Svetlana I. Gainanova , Yaroslav Y. Dudin , Arkady A. Karyakin
We report that periodic run of dynamic voltammetry upon potentiostatic operation allows recalibration of Prussian Blue (PB) based (bio)sensors. Being the most advantageous electrocatalyst for H2O2, PB suffers from solubilization by the product of its reduction, hydroxyl ion (OH¯). Square-wave voltammograms, minimally affected by the catalyzed reaction, can be recorded directly in the analyzed medium and provide prediction of the (bio)sensor sensitivity in course of its decrease down to 10–15%. Since the intrinsic sensitivity of Prussian Blue is rather high and such its loss does not hamper applicability of the corresponding (bio)sensors, the proposed recalibration allows to extend their lifetime several times avoiding interruption of continuous monitoring.
{"title":"Extended lifetime of Prussian blue based (bio)sensors through recalibration by square-wave voltammetry","authors":"Vita N. Nikitina , Vladislav M. Pleshakov , Svetlana I. Gainanova , Yaroslav Y. Dudin , Arkady A. Karyakin","doi":"10.1016/j.jelechem.2026.119872","DOIUrl":"10.1016/j.jelechem.2026.119872","url":null,"abstract":"<div><div>We report that periodic run of dynamic voltammetry upon potentiostatic operation allows recalibration of Prussian Blue (PB) based (bio)sensors. Being the most advantageous electrocatalyst for H<sub>2</sub>O<sub>2</sub>, PB suffers from solubilization by the product of its reduction, hydroxyl ion (OH¯). Square-wave voltammograms, minimally affected by the catalyzed reaction, can be recorded directly in the analyzed medium and provide prediction of the (bio)sensor sensitivity in course of its decrease down to 10–15%. Since the intrinsic sensitivity of Prussian Blue is rather high and such its loss does not hamper applicability of the corresponding (bio)sensors, the proposed recalibration allows to extend their lifetime several times avoiding interruption of continuous monitoring.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119872"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The electrochemical behaviour of nicotinamide adenine dinucleotide (NAD+ and NADH) was evaluated at carbon electrodes under three mass transport regimes: stationary macrodisc (planar diffusion), stationary microdisk (hemispherical diffusion), and rotating-disk (forced convection). Comparison of these regimes reveals how the apparent NAD+/NADH voltammetric response is transport-dependent, reflecting competition between interfacial kinetics and follow-up chemistry. Compared to transient macrodisk voltammetry, steady-state microdisk voltammetry delivered superior analytical performance, with linear ranges of 0.02–1.00 mM (NAD+) and 0.007–1.00 mM (NADH); sensitivities of 0.49 ± 0.01 nA mM−1 (NAD+) and 0.85 ± 0.01 nA mM−1 (NADH), and limits of detection (3SB/m) of 7 μM (NAD+) and 2 μM (NADH). Hydrodynamic voltammetry revealed sluggish NAD+ reduction ( = 4.35 × 10−9 ± 0.09 × 10−9 m s−1) and much faster NADH oxidation ( = 1.68 × 10−2 ± 0.04 × 10−2 m s−1). Time-resolved voltammetry enabled reagent-free kinetic monitoring of NADH degradation in acids, which showed apparent first-order behaviour with respect to both NADH and H+ (rate ∝ [NADH][H+]; overall second order), giving a pseudo-first-order half-life t1/2 ≈ 14 min at 298 K and pH 3.5, with an activation energy of 82 kJ mol−1. UV–vis spectroscopy corroborated the electrochemical rates and 1H, 13C, COSY, HSQC, and HMBC NMR identified cyclic-NADH formed via non-oxidative ring formation as the principal product, while NAD+ remains chemically stable. These findings provide mechanistic insight into non-enzymatic NADH decomposition in mildly acidic environments relevant to pharmaceutical formulation, gut absorption, and redox biology.
在固定大圆盘（平面扩散）、固定微圆盘（半球形扩散）和旋转圆盘（强制对流）三种质量传递机制下，研究了烟酰胺腺嘌呤二核苷酸（NAD+和NADH）在碳电极上的电化学行为。这些机制的比较揭示了明显的NAD+/NADH伏安响应是如何依赖于转运的，反映了界面动力学和后续化学之间的竞争。与瞬态宏盘伏安法相比，稳态微盘伏安法在0.02 ~ 1.00 mM （NAD+）和0.007 ~ 1.00 mM （NADH）的线性范围内具有更好的分析性能；灵敏度分别为0.49±0.01 nA mM−1 （NAD+）和0.85±0.01 nA mM−1 (NADH)，检出限分别为7 μM （NAD+）和2 μM (NADH)，为3SB/m。流体动力学伏安法显示NAD+还原缓慢（k0 = 4.35 × 10−9±0.09 × 10−9 m s−1），NADH氧化更快（k0 = 1.68 × 10−2±0.04 × 10−2 m s−1）。时间分辨伏安法实现了NADH在酸中降解的无试剂动力学监测，NADH和H+均表现出明显的一级行为（速率∝[NADH][H+]；总体为二级），在298 K和pH 3.5下的准一级半衰期为t1/2≈14 min，活化能为82 kJ mol−1。紫外可见光谱证实了电化学速率，1H、13C、COSY、HSQC和HMBC NMR鉴定了非氧化环形成的环状nadh为主要产物，而NAD+保持化学稳定。这些发现为在与药物配方、肠道吸收和氧化还原生物学相关的温和酸性环境中非酶促NADH分解提供了机制见解。
{"title":"Electrochemical behaviour of NAD+/NADH at carbon macro-, micro-, and rotating-disk electrodes: Degradation kinetics by time-resolved voltammetry","authors":"Phonthakorn Monthathong , Tharinda Kasemphong , Pattarawadee Therdkatanyuphong , Jinnapat Wijitsak , Tanatorn Khotavivattana , Kamonwad Ngamchuea","doi":"10.1016/j.jelechem.2026.119848","DOIUrl":"10.1016/j.jelechem.2026.119848","url":null,"abstract":"<div><div>The electrochemical behaviour of nicotinamide adenine dinucleotide (NAD<sup>+</sup> and NADH) was evaluated at carbon electrodes under three mass transport regimes: stationary macrodisc (planar diffusion), stationary microdisk (hemispherical diffusion), and rotating-disk (forced convection). Comparison of these regimes reveals how the apparent NAD<sup>+</sup>/NADH voltammetric response is transport-dependent, reflecting competition between interfacial kinetics and follow-up chemistry. Compared to transient macrodisk voltammetry, steady-state microdisk voltammetry delivered superior analytical performance, with linear ranges of 0.02–1.00 mM (NAD<sup>+</sup>) and 0.007–1.00 mM (NADH); sensitivities of 0.49 ± 0.01 nA mM<sup>−1</sup> (NAD<sup>+</sup>) and 0.85 ± 0.01 nA mM<sup>−1</sup> (NADH), and limits of detection (3S<sub>B</sub>/m) of 7 μM (NAD<sup>+</sup>) and 2 μM (NADH). Hydrodynamic voltammetry revealed sluggish NAD<sup>+</sup> reduction (<span><math><msup><mi>k</mi><mn>0</mn></msup></math></span> = 4.35 × 10<sup>−9</sup> ± 0.09 × 10<sup>−9</sup> m s<sup>−1</sup>) and much faster NADH oxidation (<span><math><msup><mi>k</mi><mn>0</mn></msup></math></span> = 1.68 × 10<sup>−2</sup> ± 0.04 × 10<sup>−2</sup> m s<sup>−1</sup>). Time-resolved voltammetry enabled reagent-free kinetic monitoring of NADH degradation in acids, which showed apparent first-order behaviour with respect to both NADH and H<sup>+</sup> (rate ∝ [NADH][H<sup>+</sup>]; overall second order), giving a pseudo-first-order half-life <em>t</em><sub>1/2</sub> ≈ 14 min at 298 K and pH 3.5, with an activation energy of 82 kJ mol<sup>−1</sup>. UV–vis spectroscopy corroborated the electrochemical rates and <sup>1</sup>H, <sup>13</sup>C, COSY, HSQC, and HMBC NMR identified cyclic-NADH formed via non-oxidative ring formation as the principal product, while NAD<sup>+</sup> remains chemically stable. These findings provide mechanistic insight into non-enzymatic NADH decomposition in mildly acidic environments relevant to pharmaceutical formulation, gut absorption, and redox biology.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119848"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A novel chemical pre-lithiation method for the supplemented lithium-deficient NCM523 | Gr-Si@C full battery system is achieved by adding a small amount of lithium-rich manganese-based material Li₁.₂Mn₀.₅₄Ni₀.₁₃Co₀.₁₃O₂(LMNCO) in the cathode material to improve the loss of active lithium ions (Li+) during the cycle process. Spherical LMNCO particles were synthesized via a solvothermal method, serving as a lithium-supplementing cathode additive. This material exhibits a charge capacity of 279.93 mAh/g and a reversible capacity of 140.25 mAh/g, corresponding to an irreversible pre-lithiation capacity of 139.68 mAh/g. During the initial formation of the solid electrolyte interphase (SEI) layer, lithium-ion loss is not only compensated for by the active lithium ions released from LMNCO, but the formation of a stable, lithium fluoride-rich SEI layer is also promoted. This robust SEI layer effectively suppresses electrolyte decomposition and mitigates volume expansion of silicon-based anodes.When 10 wt% LMNCO is incorporated into the NCM523 cathode, the full cell assembled with a Gr-Si@C anode exhibits an initial discharge specific capacity of 195.49 mAh/g—20.05 mAh/g higher than that of the non-pre-lithiated NCM523|Gr-Si@C full cell. After 200 cycles at 0.5C, the modified cell maintains a capacity retention of 67.53% and shows a 33.4% increase in energy density compared with the non-pre-lithiated control.
{"title":"Lithium-rich Li₁.₂Mn₀.₅₄Ni₀.₁₃Co₀.₁₃O₂ as a high-efficiency cathode pre-lithiation agent for silicon-based lithium-ion batteries","authors":"Zhenpeng Liu, Wenping Liu, Guisheng Zhu, Weichao Zhang, Shicheng He, Ziming Zheng, Yougui Xu, Huarui Xu, Yunyun Zhao, Kunpeng Jiang","doi":"10.1016/j.jelechem.2026.119839","DOIUrl":"10.1016/j.jelechem.2026.119839","url":null,"abstract":"<div><div>A novel chemical pre-lithiation method for the supplemented lithium-deficient NCM523 | Gr-Si@C full battery system is achieved by adding a small amount of lithium-rich manganese-based material Li₁.₂Mn₀.₅₄Ni₀.₁₃Co₀.₁₃O₂(LMNCO) in the cathode material to improve the loss of active lithium ions (Li<sup>+</sup>) during the cycle process. Spherical LMNCO particles were synthesized via a solvothermal method, serving as a lithium-supplementing cathode additive. This material exhibits a charge capacity of 279.93 mAh/g and a reversible capacity of 140.25 mAh/g, corresponding to an irreversible pre-lithiation capacity of 139.68 mAh/g. During the initial formation of the solid electrolyte interphase (SEI) layer, lithium-ion loss is not only compensated for by the active lithium ions released from LMNCO, but the formation of a stable, lithium fluoride-rich SEI layer is also promoted. This robust SEI layer effectively suppresses electrolyte decomposition and mitigates volume expansion of silicon-based anodes.When 10 wt% LMNCO is incorporated into the NCM523 cathode, the full cell assembled with a Gr-Si@C anode exhibits an initial discharge specific capacity of 195.49 mAh/g—20.05 mAh/g higher than that of the non-pre-lithiated NCM523|Gr-Si@C full cell. After 200 cycles at 0.5C, the modified cell maintains a capacity retention of 67.53% and shows a 33.4% increase in energy density compared with the non-pre-lithiated control.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119839"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hydrazine (HZ) is highly toxic and widely used in chemical industry which causes environmental pollution and even has negative impact to human health. The main objective of the study was to synthesize Sulfur doped graphitic carbon nitride (S-g-CN) and ZnO nanoparticles (NPs) for electrochemical detection of HZ. The S-g-CN/ZnO was prepared via sol gel-polymerization method. The synthesized material was characterized by techniques such as Ultraviolet-Visible (UV–Vis), X-ray diffraction (XRD), X-ray photoelectron (XPS), Fourier-transform infrared (FT-IR) and scanning electron microscopy (SEM) analysis. The S-g-CN/ZnO material combines the unique properties of S- g-C3N4 and ZnO to enhance the electrochemical performance for HZ detection. ZnO, known for its excellent electrochemical properties and stability, further enhances the detection sensitivity of the composite. The electrochemical performance of S-g-CN modified glassy carbon electrode (S-g-CN/GCE) and ZnO modified glassy carbon electrode (ZnO/GCE) were evaluated for HZ detection, comparing it to a bare GCE. Results demonstrate that the S-g-CN/ZnO nanocomposites (NCs) significantly improved the electrochemical detection of HZ, exhibiting enhanced sensitivity and selectivity compared to individual S-g-CN, ZnO, or the bare GCE. This improvement is attributed to the synergistic effect of sulfur doping and the composite formation, which increased the surface area, facilitated electron transfer, and provided more active sites, using square wave voltammetry (SWV) and showed a relatively low detection limit 0.083 μM (3σ/m) with a linear range of 0.250 μM to 80 μM and good sensitivity. Overall, S-g-CN/ZnO NCs is a suitable material for low-cost detection of HZ.
{"title":"Sulfur doped graphitic carbon nitride composite with zinc oxide for electrochemical determination of hydrazine","authors":"Alemnesh Bekele , Fuad Abduro Bushira , Alemayehu Yifru , Tadesse Haile Fereja , Shimeles Addisu Kitte","doi":"10.1016/j.jelechem.2026.119821","DOIUrl":"10.1016/j.jelechem.2026.119821","url":null,"abstract":"<div><div>Hydrazine (HZ) is highly toxic and widely used in chemical industry which causes environmental pollution and even has negative impact to human health. The main objective of the study was to synthesize Sulfur doped graphitic carbon nitride (S-g-CN) and ZnO nanoparticles (NPs) for electrochemical detection of HZ. The S-g-CN/ZnO was prepared via sol gel-polymerization method. The synthesized material was characterized by techniques such as Ultraviolet-Visible (UV–Vis), X-ray diffraction (XRD), X-ray photoelectron (XPS), Fourier-transform infrared (FT-IR) and scanning electron microscopy (SEM) analysis. The S-g-CN/ZnO material combines the unique properties of S- g-C<sub>3</sub>N<sub>4</sub> and ZnO to enhance the electrochemical performance for HZ detection. ZnO, known for its excellent electrochemical properties and stability, further enhances the detection sensitivity of the composite. The electrochemical performance of S-g-CN modified glassy carbon electrode (S-g-CN/GCE) and ZnO modified glassy carbon electrode (ZnO/GCE) were evaluated for HZ detection, comparing it to a bare GCE. Results demonstrate that the S-g-CN/ZnO nanocomposites (NCs) significantly improved the electrochemical detection of HZ, exhibiting enhanced sensitivity and selectivity compared to individual S-g-CN, ZnO, or the bare GCE. This improvement is attributed to the synergistic effect of sulfur doping and the composite formation, which increased the surface area, facilitated electron transfer, and provided more active sites, using square wave voltammetry (SWV) and showed a relatively low detection limit 0.083 μM (3σ/m) with a linear range of 0.250 μM to 80 μM and good sensitivity. Overall, S-g-CN/ZnO NCs is a suitable material for low-cost detection of HZ.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119821"},"PeriodicalIF":4.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2026-01-07DOI: 10.1016/j.jelechem.2026.119806
Juan Wu, Xiaoran Ren, Kai Huang, Bencai Lin
This study develops composite polymer electrolytes (CPEs) by incorporating polydopamine-modified ZIF-8 (PDA@ZIF-8) and an ionic liquid (IL), 1-butyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide ([BMIM][TFSI]), into poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrices to reduce interfacial resistance and enhance battery stability. Leveraging ZIF-8's nanoporous structure, PDA's adhesion properties, and synergistic PDA-PVDF-HFP interactions, the PDA@ZIF-8 filler achieves uniform dispersion while preserving its integrity and improving polymer-filler compatibility. Compared to CPEs without PDA@ZIF-8 (ionic conductivity: 1.66 × 10−4 S cm−1 at 25 °C), those containing an optimal amount of PDA@ZIF-8 exhibit significantly higher conductivity. Specifically, the PH/[email protected] membrane achieves a conductivity of 2.09 × 10−4 S cm−1 at 25 °C. Furthermore, PDA@ZIF-8 incorporation substantially enhances the CPEs' mechanical properties. Owing to the excellent Li-salt dissociation capabilities of both the IL and PDA@ZIF-8, the PH/[email protected] membrane demonstrates a high Li+ transference number of 0.54. Li|PH/[email protected]|Li symmetric cells maintain a low steady-state overpotential for over 600 h. Moreover, LiFePO4|PH/[email protected]|Li batteries deliver a discharge capacity of 132 mAh g−1 and retain over 98 % capacity after 100 cycles under 0.1C at 25 °C, highlighting their strong potential for lithium-ion battery applications. This work provides an effective strategy for preparing high-performance CPEs that enhance lithium-ion battery performance.
本研究通过将聚多巴胺修饰的ZIF-8 （PDA@ZIF-8）和离子液体（IL） 1-丁基-3-甲基咪唑双（三氟甲烷磺酰）亚胺（[BMIM][TFSI]）加入聚偏氟乙烯-共六氟丙烯（PVDF-HFP）基质中，开发复合聚合物电解质（cpe），以降低界面阻力，提高电池稳定性。利用ZIF-8的纳米孔结构、PDA的粘附性能和PDA- pvdf - hfp的协同相互作用，PDA@ZIF-8填料在保持其完整性和提高聚合物填料相容性的同时实现了均匀分散。与不含PDA@ZIF-8（25°C时离子电导率为1.66 × 10−4 S cm−1）的cpe相比，含有最佳量PDA@ZIF-8的cpe电导率显著提高。具体来说，PH/[email protected]膜在25°C时的电导率为2.09 × 10−4 S cm−1。此外，PDA@ZIF-8的掺入大大提高了cpe的力学性能。由于IL和PDA@ZIF-8具有优异的锂盐解离能力，PH/[email protected]膜具有0.54的高锂离子转移数。此外，LiFePO4|PH/[email protected]|锂电池在25°C下0.1C循环100次后，放电容量可达132 mAh g - 1，并保持98%以上的容量，突出了其在锂离子电池应用中的强大潜力。这项工作为制备高性能cpe提供了一种有效的策略，可以提高锂离子电池的性能。
{"title":"Poly(vinylidene fluoride-co-hexafluoropropylene)/ionic liquid/polydopamine-modified metal-organic framework composite polymer electrolytes for lithium-ion batteries","authors":"Juan Wu, Xiaoran Ren, Kai Huang, Bencai Lin","doi":"10.1016/j.jelechem.2026.119806","DOIUrl":"10.1016/j.jelechem.2026.119806","url":null,"abstract":"<div><div>This study develops composite polymer electrolytes (CPEs) by incorporating polydopamine-modified ZIF-8 (PDA@ZIF-8) and an ionic liquid (IL), 1-butyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide ([BMIM][TFSI]), into poly(vinylidene fluoride-<em>co</em>-hexafluoropropylene) (PVDF-HFP) matrices to reduce interfacial resistance and enhance battery stability. Leveraging ZIF-8's nanoporous structure, PDA's adhesion properties, and synergistic PDA-PVDF-HFP interactions, the PDA@ZIF-8 filler achieves uniform dispersion while preserving its integrity and improving polymer-filler compatibility. Compared to CPEs without PDA@ZIF-8 (ionic conductivity: 1.66 × 10<sup>−4</sup> S cm<sup>−1</sup> at 25 °C), those containing an optimal amount of PDA@ZIF-8 exhibit significantly higher conductivity. Specifically, the PH/[email protected] membrane achieves a conductivity of 2.09 × 10<sup>−4</sup> S cm<sup>−1</sup> at 25 °C. Furthermore, PDA@ZIF-8 incorporation substantially enhances the CPEs' mechanical properties. Owing to the excellent Li-salt dissociation capabilities of both the IL and PDA@ZIF-8, the PH/[email protected] membrane demonstrates a high Li<sup>+</sup> transference number of 0.54. Li|PH/[email protected]|Li symmetric cells maintain a low steady-state overpotential for over 600 h. Moreover, LiFePO<sub>4</sub>|PH/[email protected]|Li batteries deliver a discharge capacity of 132 mAh g<sup>−1</sup> and retain over 98 % capacity after 100 cycles under 0.1C at 25 °C, highlighting their strong potential for lithium-ion battery applications. This work provides an effective strategy for preparing high-performance CPEs that enhance lithium-ion battery performance.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119806"},"PeriodicalIF":4.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2026-01-11DOI: 10.1016/j.jelechem.2026.119829
Weifeng Zhang , Jiasheng Huang , Yu Li , Yuan Yao , Jiawei Zhang , Minghua Chen
High-capacitance capacitive-type electrodes are essential for achieving high energy density in asymmertric supercapacitor. Herein, a trace Ni doping strategy is proposed to improve energy storage performance of the capacitive-type octahedral WO3 electrode. The Ni doped WO3 electrode with a 4% doping concentration exhibits the optimal energy storage performance, with an superior areal specific capacitance of 4206 mF cm−2 at 10 mA cm−2, significantly higher than that of pure WO3 (910 mF cm−2). The significantly enhanced capacitance resulting from Ni doping may be attributed to the highly symmetric octahedral crystal structure of WO3, which readily activates Jahn-Teller effects, thereby effectively altering the electronic structure and improving electrochemical performance. To explore the practical potential of the Ni doped WO3, the asymmetric supercapacitor using polypyrrole as the counter electrode is assembled and achieves a maximum capacitance of 313.8 mF cm−2, corresponding to the energy density of 72.3 μWh cm−2 at a power density of 2.6 mW cm−2. This work highlights the relationship between cation doping and crystal structure, offering a promising strategy to enhance the electrochemical performance of capacitive-type electrodes.
高容量电容型电极是实现非对称超级电容器高能量密度的关键。为了提高电容型八面体WO3电极的储能性能，提出了微量Ni掺杂策略。掺杂浓度为4%的镍掺杂WO3电极表现出最佳的储能性能，在10 mA cm−2时的面比电容达到4206 mF cm−2，显著高于纯WO3电极（910 mF cm−2）。Ni掺杂后WO3的电容显著增强可能是由于WO3具有高度对称的八面体晶体结构，极易激活Jahn-Teller效应，从而有效地改变了电子结构，提高了电化学性能。为了探索Ni掺杂WO3的实用潜力，以聚吡咯为对电极组装了不对称超级电容器，在2.6 mW cm - 2的功率密度下，其最大电容为313.8 mF cm - 2，能量密度为72.3 μWh cm - 2。这项工作强调了阳离子掺杂与晶体结构之间的关系，为提高电容型电极的电化学性能提供了一种有前途的策略。
{"title":"Trace Ni doping-enhanced capacitive WO3 electrode for high-energy-density asymmetric supercapacitors","authors":"Weifeng Zhang , Jiasheng Huang , Yu Li , Yuan Yao , Jiawei Zhang , Minghua Chen","doi":"10.1016/j.jelechem.2026.119829","DOIUrl":"10.1016/j.jelechem.2026.119829","url":null,"abstract":"<div><div>High-capacitance capacitive-type electrodes are essential for achieving high energy density in asymmertric supercapacitor. Herein, a trace Ni doping strategy is proposed to improve energy storage performance of the capacitive-type octahedral WO<sub>3</sub> electrode. The Ni doped WO<sub>3</sub> electrode with a 4% doping concentration exhibits the optimal energy storage performance, with an superior areal specific capacitance of 4206 mF cm<sup>−2</sup> at 10 mA cm<sup>−2</sup>, significantly higher than that of pure WO<sub>3</sub> (910 mF cm<sup>−2</sup>). The significantly enhanced capacitance resulting from Ni doping may be attributed to the highly symmetric octahedral crystal structure of WO<sub>3</sub>, which readily activates Jahn-Teller effects, thereby effectively altering the electronic structure and improving electrochemical performance. To explore the practical potential of the Ni doped WO<sub>3</sub>, the asymmetric supercapacitor using polypyrrole as the counter electrode is assembled and achieves a maximum capacitance of 313.8 mF cm<sup>−2</sup>, corresponding to the energy density of 72.3 μWh cm<sup>−2</sup> at a power density of 2.6 mW cm<sup>−2</sup>. This work highlights the relationship between cation doping and crystal structure, offering a promising strategy to enhance the electrochemical performance of capacitive-type electrodes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119829"},"PeriodicalIF":4.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2026-01-05DOI: 10.1016/j.jelechem.2026.119803
Piyush V. Patil , P.E. Lokhande , Vilas Kumkale , Dadaso D. Mohite , M.A. Kadam , Syed Khasim , Taymour A. Hamdalla , Deepak Kumar , Udayabhaskar Rednam
In this study, rare-earth high-entropy oxides (RE-HEO, (Ce₀.₂La₀.₂Pr₀.₂Y₀.₂Sm₀.₂)O₂-δ and Ti₃C₂Tₓ MXene nanocomposite was synthesized through a hydrothermal process followed by annealing to fabricate advanced electrode materials for supercapacitor applications. While RE-HEOs possess significant promise for energy storage, their performance is often limited by low electrical conductivity. This limitation was effectively overcome by integrating highly conductive MXene sheets. Structural and morphological analyses verified the successful formation of the RE-HEO framework and its stable composite with MXene. Electrochemical evaluation revealed that the RE-HEO–MXene electrode delivered a specific capacity of 405C g−1 at 1 A g−1, along with excellent rate capability and long-term cycling stability. Moreover, a solid-state RE-HEO–MXene//AC asymmetric supercapacitor achieved an energy density of 13.97 Wh kg−1 at a power density of 13,750 W kg−1, while maintaining 93 % of its capacitance after 10,000 cycles. These findings emphasize the synergistic contribution of MXene in improving conductivity, surface area, and electrochemical performance of RE-HEO, underscoring its strong potential for next-generation energy storage devices.
在本研究中，稀土高熵氧化物（RE-HEO）、(Ce 0 . 2 La 0 . 2 Pr 0 . 2 Y 0 . 2 Sm 0。采用水热法和退火法制备了2)O₂-δ和Ti₃C₂TₓMXene纳米复合材料，制备了用于超级电容器的高级电极材料。虽然RE-HEOs在能量存储方面具有重要的前景，但它们的性能通常受到低导电性的限制。通过集成高导电性的MXene片有效地克服了这一限制。结构和形态分析证实了RE-HEO框架的成功形成及其与MXene的稳定复合材料。电化学评价表明，RE-HEO-MXene电极在1 a g−1下的比容量为405C g−1，具有良好的倍率能力和长期循环稳定性。此外，固态RE-HEO-MXene //AC非对称超级电容器在功率密度为13,750 W kg - 1时，能量密度达到13.97 Wh kg - 1，并且在10,000次循环后保持93%的电容。这些发现强调了MXene在提高RE-HEO的电导率、表面积和电化学性能方面的协同作用，强调了其在下一代储能设备中的巨大潜力。
{"title":"MXene-integrated rare-earth high-entropy oxide nanocomposites for advanced supercapacitor applications","authors":"Piyush V. Patil , P.E. Lokhande , Vilas Kumkale , Dadaso D. Mohite , M.A. Kadam , Syed Khasim , Taymour A. Hamdalla , Deepak Kumar , Udayabhaskar Rednam","doi":"10.1016/j.jelechem.2026.119803","DOIUrl":"10.1016/j.jelechem.2026.119803","url":null,"abstract":"<div><div>In this study, rare-earth high-entropy oxides (RE-HEO, (Ce₀.₂La₀.₂Pr₀.₂Y₀.₂Sm₀.₂)O<sub>₂-<em>δ</em></sub> and Ti₃C₂Tₓ MXene nanocomposite was synthesized through a hydrothermal process followed by annealing to fabricate advanced electrode materials for supercapacitor applications. While RE-HEOs possess significant promise for energy storage, their performance is often limited by low electrical conductivity. This limitation was effectively overcome by integrating highly conductive MXene sheets. Structural and morphological analyses verified the successful formation of the RE-HEO framework and its stable composite with MXene. Electrochemical evaluation revealed that the RE-HEO–MXene electrode delivered a specific capacity of 405C g<sup>−1</sup> at 1 A g<sup>−1</sup>, along with excellent rate capability and long-term cycling stability. Moreover, a solid-state RE-HEO–MXene//AC asymmetric supercapacitor achieved an energy density of 13.97 Wh kg<sup>−1</sup> at a power density of 13,750 W kg<sup>−1</sup>, while maintaining 93 % of its capacitance after 10,000 cycles. These findings emphasize the synergistic contribution of MXene in improving conductivity, surface area, and electrochemical performance of RE-HEO, underscoring its strong potential for next-generation energy storage devices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119803"},"PeriodicalIF":4.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To address the energy efficiency bottlenecks and serial processing delays inherent in the von Neumann architecture, this study developed an artificial synapse based on the classic inorganic electrochromic material tungsten trioxide (WO₃). Unlike traditional electrical signal reading schemes, this device achieves reversible transmittance modulation through voltage-controlled ion insertion/extraction, directly utilizing optical responses to simulate key biological synapse plasticity phenomena such as paired pulse facilitation (PPF) and dynamic short-term/long-term plasticity conversion. By combining recurrent neural networks (RNN) to extract and recognise transmission response features, the device successfully achieved high-precision recognition of 26 English letters encoded by optical pulses, with an accuracy rate of 95.83%. This work highlights the potential of electrochromic devices for achieving high-performance neuromorphic computing, offering a novel approach to overcoming the von Neumann bottleneck.
{"title":"Artificial synapses with electrochromic optically responsive for signal recognition","authors":"Xueqi Chen, Junsong Peng, Manyao Wang, Shuran Liao, Yang Chen, Zongyu Huang, Xiang Qi","doi":"10.1016/j.jelechem.2026.119825","DOIUrl":"10.1016/j.jelechem.2026.119825","url":null,"abstract":"<div><div>To address the energy efficiency bottlenecks and serial processing delays inherent in the von Neumann architecture, this study developed an artificial synapse based on the classic inorganic electrochromic material tungsten trioxide (WO₃). Unlike traditional electrical signal reading schemes, this device achieves reversible transmittance modulation through voltage-controlled ion insertion/extraction, directly utilizing optical responses to simulate key biological synapse plasticity phenomena such as paired pulse facilitation (PPF) and dynamic short-term/long-term plasticity conversion. By combining recurrent neural networks (RNN) to extract and recognise transmission response features, the device successfully achieved high-precision recognition of 26 English letters encoded by optical pulses, with an accuracy rate of 95.83%. This work highlights the potential of electrochromic devices for achieving high-performance neuromorphic computing, offering a novel approach to overcoming the von Neumann bottleneck.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119825"},"PeriodicalIF":4.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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