Pub 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":"2026-01-22","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}
Pub Date : 2026-01-20DOI: 10.1016/j.jelechem.2026.119846
Chae Jung Park, Subin Choi, Youngmi Lee
RuFe mixed oxide (RuxFe2−xOy, x = 0.8, 1, 1.2) nanotubes were synthesized via electrospinning and thermal annealing, and benchmarked against single-component RuO2 counterpart for l-ascorbic acid (AA) sensing. Physical characterization confirmed hollow nanotubular structures of Ru1Fe1Oy exhibiting the highest metallic Ru0 fraction and oxygen-vacancy content, features that correlate with reduced charge-transfer resistance. In physiological pH condition (PBS, pH 7.4), Ru1Fe1Oy delivered the most favorable analytical performance for AA oxidation, with superior sensitivity, the lowest detection limit, and the fastest response time. Unlike RuO2, which showed gradual current decay during operation, Ru1Fe1Oy maintained stable amperometric responses during repeated AA injections and retained 97.2% of its initial sensitivity after 28 days. Differential pulse voltammetry further enabled simultaneous and selective detection of AA, dopamine, and uric acid. In real-sample assays of vitamin C tablets, Ru1Fe1Oy achieved near-quantitative recovery (∼100%), confirming high reliability. The synergy between Ru and Fe, a predominantly disordered (amorphous-like) structure and oxygen-vacancy enrichment, underpins the superior sensing properties. Supported by composition/thermal controls and a physical-mixture comparison, these results highlight RuFe nanotubes as cost-effective, high-performance platforms for selective AA detection in complex biological and food matrices.
通过静电纺丝和热退火法制备了RuFe混合氧化物（RuxFe2−xOy, x = 0.8, 1,1.2）纳米管，并与单组分RuO2纳米管进行了l-抗坏血酸（AA）传感的基准测试。物理表征证实了Ru1Fe1Oy的空心纳米管结构具有最高的金属Ru0分数和氧空位含量，这些特征与降低的电荷转移电阻有关。在生理pH条件下（PBS, pH 7.4）， Ru1Fe1Oy对AA氧化的分析性能最好，灵敏度高，检出限低，响应时间快。与RuO2在操作过程中逐渐衰减的电流不同，Ru1Fe1Oy在重复注射AA时保持稳定的安培响应，并在28天后保持了97.2%的初始灵敏度。差分脉冲伏安法进一步实现了AA、多巴胺和尿酸的同时和选择性检测。在维生素C片的实际样品分析中，Ru1Fe1Oy实现了近定量回收率（~ 100%），证实了高可靠性。钌和铁之间的协同作用，主要是无序（无定形）结构和氧空位富集，支撑了优越的传感性能。在组成/热控制和物理混合物比较的支持下，这些结果突出了RuFe纳米管作为复杂生物和食品基质中选择性AA检测的经济高效的高性能平台。
{"title":"Synergistic RuFe mixed oxide nanotubes with enriched oxygen vacancies for enhanced electrocatalytic oxidation of l-ascorbic acid","authors":"Chae Jung Park, Subin Choi, Youngmi Lee","doi":"10.1016/j.jelechem.2026.119846","DOIUrl":"10.1016/j.jelechem.2026.119846","url":null,"abstract":"<div><div>Ru<img>Fe mixed oxide (Ru<sub><em>x</em></sub>Fe<sub>2−<em>x</em></sub>O<sub><em>y</em></sub>, <em>x</em> = 0.8, 1, 1.2) nanotubes were synthesized via electrospinning and thermal annealing, and benchmarked against single-component RuO<sub>2</sub> counterpart for <span>l</span>-ascorbic acid (AA) sensing. Physical characterization confirmed hollow nanotubular structures of Ru<sub>1</sub>Fe<sub>1</sub>O<sub><em>y</em></sub> exhibiting the highest metallic Ru<sup>0</sup> fraction and oxygen-vacancy content, features that correlate with reduced charge-transfer resistance. In physiological pH condition (PBS, pH 7.4), Ru<sub>1</sub>Fe<sub>1</sub>O<sub><em>y</em></sub> delivered the most favorable analytical performance for AA oxidation, with superior sensitivity, the lowest detection limit, and the fastest response time. Unlike RuO<sub>2</sub>, which showed gradual current decay during operation, Ru<sub>1</sub>Fe<sub>1</sub>O<sub><em>y</em></sub> maintained stable amperometric responses during repeated AA injections and retained 97.2% of its initial sensitivity after 28 days. Differential pulse voltammetry further enabled simultaneous and selective detection of AA, dopamine, and uric acid. In real-sample assays of vitamin C tablets, Ru<sub>1</sub>Fe<sub>1</sub>O<sub><em>y</em></sub> achieved near-quantitative recovery (∼100%), confirming high reliability. The synergy between Ru and Fe, a predominantly disordered (amorphous-like) structure and oxygen-vacancy enrichment, underpins the superior sensing properties. Supported by composition/thermal controls and a physical-mixture comparison, these results highlight Ru<img>Fe nanotubes as cost-effective, high-performance platforms for selective AA detection in complex biological and food matrices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119846"},"PeriodicalIF":4.1,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036926","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 : 2026-01-20DOI: 10.1016/j.jelechem.2026.119850
M.A. Radoi , B. Tutunaru
The electrochemical reactivity of antibiotic pollutants is commonly discussed in terms of either molecular electronic activation or interfacial electrochemical kinetics, yet these two aspects are rarely evaluated simultaneously. Here, we provide a combined optical–electrochemical analysis that reveals a previously overlooked decoupling between optical-gap modulation and interfacial charge-transfer behavior. Using cefuroxime (CFRX) as a model β-lactam antibiotic, we systematically investigate the effect of halide supporting electrolytes (NaF, NaCl, NaBr) on molecular electronic structure and electrode–solution interface properties under acidic, neutral, and alkaline conditions. UV–Vis spectroscopy combined with Tauc analysis demonstrates electrolyte- and pH-dependent optical-gap narrowing, with bromide inducing the strongest electronic activation. In contrast, electrochemical impedance spectroscopy shows that the same conditions lead to increased charge-transfer resistance and reduced double-layer capacitance due to enhanced adsorption and interfacial blocking effects. By directly correlating optical activation with impedance-derived interfacial parameters, this study establishes that optical-gap reduction is not a direct indicator of interfacial charge-transfer behavior governing electrochemical reactivity. The findings highlight electrolyte-induced interfacial accessibility as a critical, yet often overlooked, factor in electrochemical water treatment and provide mechanistic insight into interfacial processes relevant to reactivity prediction rather than direct measurements of degradation rates.
{"title":"Electrolyte-induced electronic activation and interfacial blocking of cefuroxime: An optical and impedance study","authors":"M.A. Radoi , B. Tutunaru","doi":"10.1016/j.jelechem.2026.119850","DOIUrl":"10.1016/j.jelechem.2026.119850","url":null,"abstract":"<div><div>The electrochemical reactivity of antibiotic pollutants is commonly discussed in terms of either molecular electronic activation or interfacial electrochemical kinetics, yet these two aspects are rarely evaluated simultaneously. Here, we provide a combined optical–electrochemical analysis that reveals a previously overlooked decoupling between optical-gap modulation and interfacial charge-transfer behavior. Using cefuroxime (CFRX) as a model β-lactam antibiotic, we systematically investigate the effect of halide supporting electrolytes (NaF, NaCl, NaBr) on molecular electronic structure and electrode–solution interface properties under acidic, neutral, and alkaline conditions. UV–Vis spectroscopy combined with Tauc analysis demonstrates electrolyte- and pH-dependent optical-gap narrowing, with bromide inducing the strongest electronic activation. In contrast, electrochemical impedance spectroscopy shows that the same conditions lead to increased charge-transfer resistance and reduced double-layer capacitance due to enhanced adsorption and interfacial blocking effects. By directly correlating optical activation with impedance-derived interfacial parameters, this study establishes that optical-gap reduction is not a direct indicator of interfacial charge-transfer behavior governing electrochemical reactivity. The findings highlight electrolyte-induced interfacial accessibility as a critical, yet often overlooked, factor in electrochemical water treatment and provide mechanistic insight into interfacial processes relevant to reactivity prediction rather than direct measurements of degradation rates.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119850"},"PeriodicalIF":4.1,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036935","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 : 2026-01-20DOI: 10.1016/j.jelechem.2026.119845
Yifeng Guo , Zhaomeng Wu , Hangtong Zhao , Xiaoguang Wu , Guofeng Chang , Yang Wang , Xiaochen Xu , Shaobin Yang , Wei Dong
Cellulose powder (CA) was employed as the raw material and dissolved in a NaOH/urea aqueous solvent system at low temperatures to form a three-dimensional gel network. Nickel nitrate was simultaneously introduced as the nickel source during this process. The resulting gel underwent freeze-drying, followed by gradient pyrolysis and acid washing treatments, to achieve uniform dispersion of nickel nanoparticles within the nitrogen-doped carbon skeleton. Notably, the urea dissolution system was innovatively utilized to synchronously accomplish nitrogen doping and metal anchoring. Optimizing the loading amount of nickel nanoparticles led to the successful preparation of a carbon aerogel cathode material, denoted as 2Ni/NUCA. This material demonstrated exceptional electrochemical performance in lithium sulfur batteries. The three dimensionally cross-linked fibrous carbon network significantly enhanced electrical conductivity by shortening the charge transport pathways and effectively accommodated the volume expansion of sulfur. Furthermore, the uniformly dispersed nickel nanoparticles substantially accelerated the redox kinetics of polysulfides through interfacial catalytic effects. The 2Ni/NUCA/S electrode achieved an initial discharge specific capacity of 605.0 mAh/g at a current density of 4C. It maintained a capacity of 487.9 mAh/g after 800 cycles, corresponding to a high capacity retention of 80.6%. The average capacity decay per cycle was as low as 0.024%.
{"title":"Nickel nanoparticles embedded in nitrogen doped cellulose derived carbon aerogel for enhanced cycling stability of Lithium Sulfur batteries via synergistic porous and catalytic interfaces","authors":"Yifeng Guo , Zhaomeng Wu , Hangtong Zhao , Xiaoguang Wu , Guofeng Chang , Yang Wang , Xiaochen Xu , Shaobin Yang , Wei Dong","doi":"10.1016/j.jelechem.2026.119845","DOIUrl":"10.1016/j.jelechem.2026.119845","url":null,"abstract":"<div><div>Cellulose powder (CA) was employed as the raw material and dissolved in a NaOH/urea aqueous solvent system at low temperatures to form a three-dimensional gel network. Nickel nitrate was simultaneously introduced as the nickel source during this process. The resulting gel underwent freeze-drying, followed by gradient pyrolysis and acid washing treatments, to achieve uniform dispersion of nickel nanoparticles within the nitrogen-doped carbon skeleton. Notably, the urea dissolution system was innovatively utilized to synchronously accomplish nitrogen doping and metal anchoring. Optimizing the loading amount of nickel nanoparticles led to the successful preparation of a carbon aerogel cathode material, denoted as 2Ni/NUCA. This material demonstrated exceptional electrochemical performance in lithium sulfur batteries. The three dimensionally cross-linked fibrous carbon network significantly enhanced electrical conductivity by shortening the charge transport pathways and effectively accommodated the volume expansion of sulfur. Furthermore, the uniformly dispersed nickel nanoparticles substantially accelerated the redox kinetics of polysulfides through interfacial catalytic effects. The 2Ni/NUCA/S electrode achieved an initial discharge specific capacity of 605.0 mAh/g at a current density of 4C. It maintained a capacity of 487.9 mAh/g after 800 cycles, corresponding to a high capacity retention of 80.6%. The average capacity decay per cycle was as low as 0.024%.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119845"},"PeriodicalIF":4.1,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036940","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 : 2026-01-20DOI: 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":"2026-01-20","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 : 2026-01-19DOI: 10.1016/j.jelechem.2026.119835
Yu Tian , Hongbo Liu , Jiaqi Wan , Shuo Tang , Kang cen , Qiang li , Sibo Fu
The Vanadium Redox Flow Battery (VRFB) holds significant promise for large-scale energy storage applications due to its high safety, long cycle life, and favorable environmental characteristics. However, VRFBs face challenges at high current density, such as concentration polarization and electrochemical kinetic hysteresis, which limit their energy conversion efficiency and power density. To alleviate these limitations, this paper proposes an innovative bipolar plate (BPP) design. By integrating micromagnets onto the BPP, the magnetohydrodynamic (MHD) effect enhances the electrolyte's mass transfer process. Using a multi-physics field-coupled numerical simulation approach, this study systematically investigates the impact of the micromagnet-loaded BPP structure on ion transport and electrochemical performance. The results demonstrate that the micromagnet-loaded design optimizes electrolyte flow distribution, improves ion transport pathways, mitigates concentration polarization, and enhances electrochemical reaction efficiency at the electrode, thereby significantly improving battery performance. This paper presents a novel design approach for enhancing the energy efficiency of VRFBs, particularly in terms of achieving high power density and effective energy conversion.
{"title":"Micromagnet-loaded bipolar plate design for vanadium redox flow batteries: Improved mass transport and electrochemical performance","authors":"Yu Tian , Hongbo Liu , Jiaqi Wan , Shuo Tang , Kang cen , Qiang li , Sibo Fu","doi":"10.1016/j.jelechem.2026.119835","DOIUrl":"10.1016/j.jelechem.2026.119835","url":null,"abstract":"<div><div>The Vanadium Redox Flow Battery (VRFB) holds significant promise for large-scale energy storage applications due to its high safety, long cycle life, and favorable environmental characteristics. However, VRFBs face challenges at high current density, such as concentration polarization and electrochemical kinetic hysteresis, which limit their energy conversion efficiency and power density. To alleviate these limitations, this paper proposes an innovative bipolar plate (BPP) design. By integrating micromagnets onto the BPP, the magnetohydrodynamic (MHD) effect enhances the electrolyte's mass transfer process. Using a multi-physics field-coupled numerical simulation approach, this study systematically investigates the impact of the micromagnet-loaded BPP structure on ion transport and electrochemical performance. The results demonstrate that the micromagnet-loaded design optimizes electrolyte flow distribution, improves ion transport pathways, mitigates concentration polarization, and enhances electrochemical reaction efficiency at the electrode, thereby significantly improving battery performance. This paper presents a novel design approach for enhancing the energy efficiency of VRFBs, particularly in terms of achieving high power density and effective energy conversion.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119835"},"PeriodicalIF":4.1,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036938","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 : 2026-01-18DOI: 10.1016/j.jelechem.2026.119841
Weilin Liu , Kaijing Zhao , Xin Wan , Shiyu Lu , Yongjiang Di , Shuai Long , Cheng Zhang , Meng Jin , Jun Zhang , Peng Peng
The oxygen evolution reaction (OER) is a core half-reaction in clean energy technologies like water splitting, and the development of high-efficiency OER catalysts is critical for overcoming the energy conversion efficiency bottleneck. The development of efficient OER catalysts based on metal-embedded porous carbon nanofibers (CNFs) is often hampered by complex synthesis procedures. This study presents a phosphoric acid-mediated synthesis strategy for fabricating FeCo bimetallic nanoalloys anchored on nitrogen-doped porous carbon nanofibers (FeCo@N-PCNFs). By integrating phosphoric acid with polyvinyl alcohol (PVA), a stabilized carbon framework is formed, enabling homogeneous dispersion of FeCo nanoparticles. Hierarchical porosity is simultaneously generated through PTFE decomposition during pyrolysis. The optimized FeCo@N-PCNFs demonstrate superior OER performance in 1 M KOH, requiring an overpotential of 273 mV to reach 10 mA cm−2, outperforming commercial RuO2 (320 mV). The catalyst maintains 91.4% of its initial current over 32 h, with enhanced charge transfer kinetics (Rct = 0.77 Ω). This method simplifies the synthesis of porous carbon-based electrocatalysts while achieving high activity and durability.
析氧反应（OER）是水裂解等清洁能源技术中的核心半反应，开发高效的OER催化剂是克服能量转化效率瓶颈的关键。基于金属包埋多孔碳纳米纤维（CNFs）的高效OER催化剂的开发经常受到复杂的合成过程的阻碍。本研究提出了一种磷酸介导的合成策略，用于制造锚定在氮掺杂多孔碳纳米纤维上的FeCo双金属纳米合金（FeCo@N-PCNFs）。通过将磷酸与聚乙烯醇（PVA）结合，形成稳定的碳框架，使FeCo纳米颗粒均匀分散。在热解过程中，聚四氟乙烯分解同时产生分层孔隙。优化后的FeCo@N-PCNFs在1 M KOH下表现出优异的OER性能，需要273 mV的过电位才能达到10 mA cm - 2，优于商用RuO2 （320 mV）。催化剂在32小时内保持了91.4%的初始电流，并增强了电荷转移动力学（Rct = 0.77 Ω）。该方法简化了多孔碳基电催化剂的合成，同时实现了高活性和耐用性。
{"title":"Phosphoric acid-assisted synthesis of FeCo nanoalloys in N-doped carbon fibers toward high-efficiency oxygen evolution reaction","authors":"Weilin Liu , Kaijing Zhao , Xin Wan , Shiyu Lu , Yongjiang Di , Shuai Long , Cheng Zhang , Meng Jin , Jun Zhang , Peng Peng","doi":"10.1016/j.jelechem.2026.119841","DOIUrl":"10.1016/j.jelechem.2026.119841","url":null,"abstract":"<div><div>The oxygen evolution reaction (OER) is a core half-reaction in clean energy technologies like water splitting, and the development of high-efficiency OER catalysts is critical for overcoming the energy conversion efficiency bottleneck. The development of efficient OER catalysts based on metal-embedded porous carbon nanofibers (CNFs) is often hampered by complex synthesis procedures. This study presents a phosphoric acid-mediated synthesis strategy for fabricating FeCo bimetallic nanoalloys anchored on nitrogen-doped porous carbon nanofibers (FeCo@N-PCNFs). By integrating phosphoric acid with polyvinyl alcohol (PVA), a stabilized carbon framework is formed, enabling homogeneous dispersion of FeCo nanoparticles. Hierarchical porosity is simultaneously generated through PTFE decomposition during pyrolysis. The optimized FeCo@N-PCNFs demonstrate superior OER performance in 1 M KOH, requiring an overpotential of 273 mV to reach 10 mA cm<sup>−2</sup>, outperforming commercial RuO<sub>2</sub> (320 mV). The catalyst maintains 91.4% of its initial current over 32 h, with enhanced charge transfer kinetics (R<sub>ct</sub> = 0.77 Ω). This method simplifies the synthesis of porous carbon-based electrocatalysts while achieving high activity and durability.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119841"},"PeriodicalIF":4.1,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036924","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 : 2026-01-18DOI: 10.1016/j.jelechem.2026.119840
Shuang Yang , Junyi You , Yukui Tong, Fang Chai, Miaomiao Tian
A dual-mode (ratiometric electrochemical and colorimetric) sensor for acetaminophen (ACM) was successfully developed using novel functional monomers: iron-coordinated 5-aminophenaminophenanthroline (PAP) and 3,4-ethylenedioxythiophene (EDOT). The PAP monomer played a dual role; it facilitated specific molecular recognition of ACM through coordination interactions while simultaneously serving as an intrinsic electrochemical signal source via the Fe2+/Fe3+ redox couple. This ingenious design established a self-referenced sensing system based on the monomer's inherent conductivity. An ACM-selective molecularly imprinted polymeric film was fabricated via electropolymerization. The optimized electrochemical sensor demonstrated excellent performance, featuring a wide linear detection range from 0.06 to 1000 μM, an ultra-low detection limit of 0.026 μM, and satisfactory recoveries between 96.7% and 103.9% in real sample analysis. In a complementary colorimetric mode, ACM'S inherent reducing capability triggered the reduction of oxidized TMB (OXTMB), producing a measurable color change. This integrated dual-platform strategy significantly enhances detection reliability through cross-validation and extends practical application scope, presenting a robust and versatile paradigm for analytical detection systems with considerable potential in food safety and health monitoring.
{"title":"Dual model ratiometric electrochemical/colorimetric sensor based on advanced signal amplification strategies for sensitive detection of acetaminophen","authors":"Shuang Yang , Junyi You , Yukui Tong, Fang Chai, Miaomiao Tian","doi":"10.1016/j.jelechem.2026.119840","DOIUrl":"10.1016/j.jelechem.2026.119840","url":null,"abstract":"<div><div>A dual-mode (ratiometric electrochemical and colorimetric) sensor for acetaminophen (ACM) was successfully developed using novel functional monomers: iron-coordinated 5-aminophenaminophenanthroline (PAP) and 3,4-ethylenedioxythiophene (EDOT). The PAP monomer played a dual role; it facilitated specific molecular recognition of ACM through coordination interactions while simultaneously serving as an intrinsic electrochemical signal source via the Fe<sup>2+</sup>/Fe<sup>3+</sup> redox couple. This ingenious design established a self-referenced sensing system based on the monomer's inherent conductivity. An ACM-selective molecularly imprinted polymeric film was fabricated via electropolymerization. The optimized electrochemical sensor demonstrated excellent performance, featuring a wide linear detection range from 0.06 to 1000 μM, an ultra-low detection limit of 0.026 μM, and satisfactory recoveries between 96.7% and 103.9% in real sample analysis. In a complementary colorimetric mode, ACM'S inherent reducing capability triggered the reduction of oxidized TMB (OXTMB), producing a measurable color change. This integrated dual-platform strategy significantly enhances detection reliability through cross-validation and extends practical application scope, presenting a robust and versatile paradigm for analytical detection systems with considerable potential in food safety and health monitoring.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119840"},"PeriodicalIF":4.1,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036936","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 commercialization of silicon monoxide (SiOₓ) anodes has been hindered by their poor cycling stability resulting from significant volume expansion during cycling. Composite doping represents a common strategy to address this issue. In this study, a ternary core–shell architecture was constructed via a one-step approach, and for the first time, the feasibility of co-incorporating both anatase and rutile TiO₂ phases into a SiOₓ/C core–shell framework was demonstrated. Furthermore, the distinct mechanisms by which each crystal phase enhances the electrochemical performance of the composite were systematically elucidated: the anatase phase primarily establishes a stable Li+ conduction network, thereby improving long-term cycling stability, while the rutile phase significantly enhances Li+ diffusion kinetics through its unique crystalline channels, leading to superior rate capability. The TiO₂–SiOₓ/C composite prepared with anatase TiO₂ exhibited an initial discharge capacity of 1830.32 mAh g−1 and retained 997.10 mAh g−1 after 300 cycles, corresponding to a capacity retention of 53.96%. In contrast, the composite incorporating rutile TiO₂ delivered specific capacities of 1066.11, 991.92, 890.98, and 679.23 mAh g−1 at current densities of 0.3, 0.5, 1.0, and 3.0 A g−1, respectively.
一氧化硅（SiOₓ）阳极在循环过程中由于体积膨胀导致循环稳定性差，阻碍了其商业化。复合兴奋剂是解决这一问题的常用策略。在本研究中，通过一步法构建了三元核壳结构，并首次证明了将锐钛矿和金红石tio2相共同纳入SiOₓ/C核壳框架的可行性。此外，系统地阐明了每种晶体相增强复合材料电化学性能的不同机制：锐钛矿相主要建立稳定的Li+传导网络，从而提高长期循环稳定性，而金红石相通过其独特的晶体通道显著增强Li+扩散动力学，从而具有优越的速率能力。以钛矿tio2为原料制备的tio2 -SiOₓ/C复合材料的初始放电容量为1830.32 mAh g−1，循环300次后容量保持率为997.10 mAh g−1，容量保持率为53.96%。相比之下，含金红石tio2的复合材料在电流密度为0.3、0.5、1.0和3.0 A g−1时的比容量分别为1066.11、991.92、890.98和679.23 mAh g−1。
{"title":"A ternary TiO2/SiOx/C composite with different crystalline phases of TiO2 as an anode material for high performance lithium-ion batteries","authors":"Xiangwu Zhao, Minglu Liu, Hao He, Fangfang Wang, Shengwen Zhong","doi":"10.1016/j.jelechem.2026.119831","DOIUrl":"10.1016/j.jelechem.2026.119831","url":null,"abstract":"<div><div>The commercialization of silicon monoxide (SiOₓ) anodes has been hindered by their poor cycling stability resulting from significant volume expansion during cycling. Composite doping represents a common strategy to address this issue. In this study, a ternary core–shell architecture was constructed via a one-step approach, and for the first time, the feasibility of co-incorporating both anatase and rutile TiO₂ phases into a SiOₓ/C core–shell framework was demonstrated. Furthermore, the distinct mechanisms by which each crystal phase enhances the electrochemical performance of the composite were systematically elucidated: the anatase phase primarily establishes a stable Li<sup>+</sup> conduction network, thereby improving long-term cycling stability, while the rutile phase significantly enhances Li<sup>+</sup> diffusion kinetics through its unique crystalline channels, leading to superior rate capability. The TiO₂–SiOₓ/C composite prepared with anatase TiO₂ exhibited an initial discharge capacity of 1830.32 mAh g<sup>−1</sup> and retained 997.10 mAh g<sup>−1</sup> after 300 cycles, corresponding to a capacity retention of 53.96%. In contrast, the composite incorporating rutile TiO₂ delivered specific capacities of 1066.11, 991.92, 890.98, and 679.23 mAh g<sup>−1</sup> at current densities of 0.3, 0.5, 1.0, and 3.0 A g<sup>−1</sup>, respectively.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119831"},"PeriodicalIF":4.1,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146048998","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":"2026-01-17","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}
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