Journal of Electroanalytical Chemistry最新文献_第6页

ZIF-67-derived supported NiFe-LDH composite bimetallic sulfides (Ni Fe) with hierarchical structure for efficient oxygen evolution reaction zif -67衍生的具有分层结构的负载型NiFe-LDH复合双金属硫化物（Ni Fe）用于高效析氧反应

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-21 DOI: 10.1016/j.jelechem.2025.119665

Yaoxia Yang, Fuxing Zhou, Ruirui Zhang, Bolin Xiong, Zhen Yao, Dongfei Sun, Qingtao Wang, Zhiwang Yang

Hydrogen is the most suitable green energy for the current era, and electrolyzing water to produce hydrogen is the most efficient preparation method. The development of efficient oxygen evolution reaction (OER) electrocatalysts is crucial for sustainable energy conversion. In our work, we construct a hierarchical CNFS@NiFe-LDH/NF heterostructure by integrating ZIF-67-derived cobalt sulfide with nickel‑iron layered double hydroxide (LDH) and bimetallic sulfides on nickel foam (NF). This composite synergistically combines the high surface area and active sites from the MOF-derived sulfide, the tunable layered structure and abundant -OH groups from the LDH-which facilitate OH⁻ adsorption and OO formation-as well as electronic modulation effects from the bimetallic sulfides. The catalyst exhibits excellent OER performance with an overpotential of 236 mV at 10 mA cm⁻² and a Tafel slope of 42.23 mV dec⁻¹ under alkaline conditions, and maintains high conductivity and low charge transfer resistance throughout operation. Meanwhile, the catalyst showed excellent stability for at least 66 h during the OER process at 50 mA cm⁻², which demonstrates outstanding durability. Moreover, this catalyst have satisfactory hydrophilicity/aerophobicity. This work provides an effective strategy for designing high-performance and stable electrocatalysts via heterogeneous interface engineering.

氢是当前时代最适合的绿色能源，而电解水制氢是最高效的制备方法。高效析氧反应（OER）电催化剂的开发是实现能量可持续转化的关键。在我们的工作中，我们通过将zif -67衍生的硫化钴与镍铁层状双氢氧化物（LDH）和双金属硫化物集成在泡沫镍（NF）上，构建了层次化CNFS@NiFe-LDH/NF异质结构。该复合材料协同结合了mof衍生硫化物的高表面积和活性位点，可调的层状结构和来自ldh的丰富-OH基团（促进OH -吸附和OO形成）以及双金属硫化物的电子调制效应。该催化剂表现出优异的OER性能，在10 mA cm−2下过电位为236 mV，在碱性条件下Tafel斜率为42.23 mV dec−1，并在整个运行过程中保持高电导率和低电荷转移电阻。同时，该催化剂在50 mA cm−2的OER过程中表现出至少66 h的优异稳定性，表现出优异的耐久性。此外，该催化剂还具有良好的亲水性/疏氧性。本研究为通过非均相界面工程设计高性能稳定的电催化剂提供了有效的策略。

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引用次数: 0

HEDTA enhanced the selectivity and stability of the copper-silver catalyst for electro-reducing carbon dioxide to multi-carbon products heta提高了铜银催化剂电还原二氧化碳生成多碳产物的选择性和稳定性

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-20 DOI: 10.1016/j.jelechem.2025.119672

Yaoxuan Wang , Hong Liu , Ye Bai , Yingchen Yang , Weidong Shi

Electrochemical carbon dioxide reduction (CO₂RR), powered by renewable energy sources, has emerged as a sustainable approach for producing valuable chemicals and fuels, offering significant commercial potential. However, in near-neutral electrolytes, the instability and low Faradic efficiency (FE) of the multi‑carbon (C₂₊) products hindered the industrial application of CO₂RR. In this study, we prepared a CuAg catalyst functionalized with N-(2-hydroxyethyl)ethylenediamine-N,N′,N′-triacetic acid (HEDTA) ligands (CuAg/HEDTA) through a controlled electrodeposition process. The CuAg/HEDTA catalyst exhibited a considerable FE for C₂₊ products (FE_C2+) of 55.0 ± 1.6 % at −1.3 V vs. RHE in 0.1 M KHCO₃ and demonstrated impressive stability, with FE_C2+ remained 40.5 % after 40 h of CO₂RR (retaining 73.6 % of initial FE). In contrast, the CuAg and Cu/HEDTA catalysts achieved maximum FE_C2+ of only 41.1 ± 1.8 % and 45.6 ± 1.3 %, respectively. After 40 h of CO₂RR, FE_C2+ of CuAg and Cu/HEDTA decreased to 16.0 % and 20.0 %, corresponding to 38.9 % and 43.9 % retention of the initial FE. The results indicated that ligand modification significantly enhanced the selectivity and stability of the catalyst for producing C₂₊ products, providing a feasible approach to advancing the transition of CO₂RR to value-added chemicals. This study provided valuable insights into the establishment of highly stable and efficient catalysts for the conversion of CO₂ to valuable multi‑carbon products.

由可再生能源提供动力的电化学二氧化碳还原（CO2RR）已成为生产有价值化学品和燃料的可持续方法，具有巨大的商业潜力。然而，在近中性电解质中，多碳（C2+）产物的不稳定性和较低的法拉氏效率（FE）阻碍了CO2RR的工业应用。在本研究中，我们通过控制电沉积工艺制备了以N-（2-羟乙基）乙二胺-N，N ',N ' -三乙酸（HEDTA）配体（CuAg/HEDTA）为官能化的CuAg催化剂。CuAg/HEDTA催化剂在−1.3 V条件下对C2+产物（FEC2+）的FE比在0.1 M KHCO3条件下的RHE高55.0±1.6%，并表现出令人印象印象的稳定性，在CO2RR作用40小时后，FEC2+仍保持40.5%（保留初始FE的73.6%）。相比之下，CuAg和Cu/HEDTA催化剂的最大FEC2+分别仅为41.1±1.8%和45.6%±1.3%。CO2RR作用40 h后，CuAg和Cu/HEDTA的FEC2+分别降至16.0%和20.0%，分别为初始FE的38.9%和43.9%。结果表明，配体修饰显著提高了催化剂生成C2+产物的选择性和稳定性，为推进CO2RR向高附加值化学品的转变提供了可行的途径。该研究为建立高稳定性和高效的催化剂将二氧化碳转化为有价值的多碳产品提供了有价值的见解。

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引用次数: 0

Untrafine PdCu alloys dispersedly immobilized on hairy graphene oxide for enhanced electrocatalytic nitrate reduction 非晶PdCu合金分散固定在毛状氧化石墨烯上，用于增强电催化硝酸还原

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-20 DOI: 10.1016/j.jelechem.2025.119673

Ling Wang, Yan Wu, Yutong Zhang, Mingye Zhao, Xiaoshuang Yin, Wenzhong Yang, Hui Xu

Electrocatalytic nitrate reduction (NO₃RR) is an efficient technique for nitrate removal. In this work, we successfully synthesized Pd_xCu_y@rGO-g-P4VP composite as electrocatalytic catalyst for nitrate reduction. Our synthetic method ensured uniform distribution of PdCu alloy nanoparticles on the P4VP-grafted rGO without notable aggregation. This approach achieves precise control over alloy particle size, consistently below 5 nm, thus providing a higher specific surface area that increases the exposure of active sites and potentially enhances catalytic efficiency. Additionally, the P4VP polymer chains effectively stabilized the PdCu alloy particles, preventing detachment and significantly improving the durability and recyclability of the catalyst. The optimized Pd_xCu_y@rGO-g-P4VP catalyst exhibited outstanding performance at an applied voltage of −1.4 V, with a nitrate conversion rate of 99.41% and nitrogen selectivity of 80.37%. These findings underscore the potential of this method for high-efficiency and selective electrocatalytic denitrification, providing valuable insights for future catalyst design.

电催化硝酸还原（NO3RR）是一种高效的硝酸盐脱除技术。在这项工作中，我们成功地合成了PdxCuy@rGO-g-P4VP复合材料作为硝酸还原的电催化催化剂。我们的合成方法确保了PdCu合金纳米颗粒在p4vp接枝的氧化石墨烯上均匀分布，没有明显的聚集。这种方法实现了对合金粒度的精确控制，始终低于5纳米，从而提供了更高的比表面积，增加了活性位点的暴露，并有可能提高催化效率。此外，P4VP聚合物链有效地稳定了PdCu合金颗粒，防止了分离，显著提高了催化剂的耐久性和可回收性。优化后的PdxCuy@rGO-g-P4VP催化剂在−1.4 V电压下表现出优异的性能，硝酸转化率为99.41%，氮选择性为80.37%。这些发现强调了这种方法在高效和选择性电催化脱氮方面的潜力，为未来的催化剂设计提供了有价值的见解。

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引用次数: 0

High voltage LiMnxFe1-xPO4@NC cathode material for lithium-ion rechargeable batteries 高压LiMnxFe1-xPO4@NC锂离子可充电电池正极材料

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-20 DOI: 10.1016/j.jelechem.2025.119670

Nurzhan Baikalov , Rakhat Agassultanov , Zhaniya Sagyngerey , Shynggys Sariyev , Almas Tokenov , Zhumabay Bakenov , Aishuak Konarov

LiFePO₄ (LFP) is a prospective material for use in electric vehicles (EVs), but it has low energy density. One of the ways of solving this problem is adding Mn ions. Mn ions induce higher voltage for the battery material. This work examined the properties of LiMn_xFe_1-xPO₄ (LMFP) cathode material synthesized via solvothermal method and further coated with amorphous carbon and N-doped amorphous carbon. Three samples of x = 0.8, 0.6, and 0.5 further noted as LMFP08, LMFP06 and LMFP05 were synthesized to find the best performance by balancing the ratios of components for synthesis. N-doped carbon coating was synthesized using a solution of sucrose-glycine to enhance electrochemical conductivity and ion transport kinetics. Morphological and physical characterization of the material showed sub-micron rods with a conformal amorphous carbon shell. Galvanostatic charge and discharge cycling were performed showing LMFP08@C 140 mAh g⁻¹, LMFP08@NC 157 mAh g⁻¹, LMFP06@NC 130 mAh g⁻¹, LMFP05@NC 148 mAh g⁻¹ of initial discharge capacity with LMFP06@NC retaining ∼120 mAh g⁻¹ after 200 cycles at 0.1C and samples with N doping showed remarkably better stability than the sample with bare amorphous carbon coating. This work's results demonstrate that glycine and sucrose derived N-doped amorphous carbon coating improves interfacial kinetics and stability in comparison with amorphous carbon coating, while reaching close to theoretical capacities

LiFePO4 （LFP）是一种很有前景的电动汽车材料，但其能量密度较低。解决这个问题的方法之一是加入Mn离子。锰离子对电池材料产生更高的电压。研究了溶剂热法制备的LiMnxFe1-xPO4 （LMFP）正极材料的性能，并进一步包覆非晶碳和掺n非晶碳。合成x = 0.8, 0.6, 0.5三个样品，分别为LMFP08， LMFP06和LMFP05，通过平衡合成组分的比例来寻找最佳性能。采用蔗糖-甘氨酸溶液合成了氮掺杂碳涂层，以提高其电化学电导率和离子传输动力学。该材料的形态和物理表征为亚微米棒状，具有保形无定形碳壳。恒流充放电循环显示LMFP08@C 140 mAh g - 1， LMFP08@NC 157 mAh g - 1, LMFP06@NC 130 mAh g - 1， LMFP05@NC 148 mAh g - 1的初始放电容量，LMFP06@NC在0.1C下循环200次后保持~ 120 mAh g - 1，掺杂N的样品比裸无定形碳涂层样品表现出明显更好的稳定性。这项工作的结果表明，与非晶态碳涂层相比，甘氨酸和蔗糖衍生的n掺杂非晶态碳涂层改善了界面动力学和稳定性，同时接近理论容量

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引用次数: 0

Rational design of nanocellulose/N, S co-doped graphene composites with dense porous structure for high-performance aqueous and flexible solid-state supercapacitors 合理设计具有致密多孔结构的纳米纤维素/N， S共掺杂石墨烯复合材料，用于高性能水性和柔性固态超级电容器

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-20 DOI: 10.1016/j.jelechem.2025.119671

Linjie Li , Jiajun Chen , Yong Zhang , Chaohui Wang , Wenhui Ma , Xuefeng Wang , Shan Fan

In this study, within a hydrothermal system, graphene oxide was used as the reaction precursor, ammonium sulfate and glutamic acid were selected as heteroatom sources, reducing agents, and functional reagents. Meanwhile, nanocellulose extracted from agricultural waste corn stover was utilized as a physical spacer and an ion transport carrier. Thus, nanocellulose/N, S co-doped graphene composites with hierarchical porous morphology, high packing density, and a large number of heteroatomic groups were successfully constructed. Among them, the aqueous symmetric supercapacitors with the composites as electrode materials deliver good gravimetric/volumetric capacitance characteristics(290.3 F g⁻¹ and 409.4 F cm⁻³), high energy density (10.1 Wh kg⁻¹ and 14.2 Wh L⁻¹), satisfactory rate capacity, and long cycle life. Furthermore, by introducing KOH, nanocellulose, and graphene oxide into the polyvinyl alcohol matrix, a new gel electrolyte was prepared. Due to the penetration of nanocellulose and graphene sheet throughout the entire system, the flexible solid-state supercapacitors based on the new gel electrolyte and the composites exhibits high specific capacitance (228.5 F g⁻¹), good rate performance (84.0 %), and remarkable mechanical properties. In summary, the samples and electrolyte prepared in this study are suitable for supercapacitors.

本研究在水热体系中，以氧化石墨烯为反应前驱体，选择硫酸铵和谷氨酸作为杂原子源、还原剂和功能试剂。同时，利用从农业废玉米秸秆中提取的纳米纤维素作为物理间隔剂和离子输运载体。因此，成功构建了具有分层多孔形态、高堆积密度和大量杂原子基团的纳米纤维素/N， S共掺杂石墨烯复合材料。其中，以复合材料为电极材料的水对称超级电容器具有良好的重量/体积电容特性（290.3 F g−1和409.4 F cm−3），高能量密度（10.1 Wh kg−1和14.2 Wh L−1），令人满意的倍率容量和较长的循环寿命。通过在聚乙烯醇基体中引入KOH、纳米纤维素和氧化石墨烯，制备了一种新型凝胶电解质。由于纳米纤维素和石墨烯片渗透于整个体系中，基于新型凝胶电解质和复合材料的柔性固态超级电容器具有高比电容（228.5 F g−1），良好的倍率性能（84.0%）和显著的力学性能。综上所述，本研究制备的样品和电解质适用于超级电容器。

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引用次数: 0

Comparative study of the corrosion resistance and electrochemical migration behavior of Sn58Bi, Sn37Pb, Sn0.7Cu, and Sn3Ag0.5Cu solder alloys Sn58Bi、Sn37Pb、Sn0.7Cu和Sn3Ag0.5Cu钎料合金的耐蚀性和电化学迁移行为对比研究

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-19 DOI: 10.1016/j.jelechem.2025.119668

Fuye Lu , Han Sun , Yulong Wang , Yunpeng Wang , Jinye Yao , Haitao Ma

In harsh environments characterized by high humidity and salt content, solder joints are susceptible to corrosion caused by moisture and contaminants. This poses a significant challenge to the long-term reliability of solder alloys. This study systematically investigated the corrosion resistance and electrochemical migration (ECM) behavior of Sn58Bi with Sn37Pb, Sn0.7Cu and Sn3Ag0.5Cu solder alloys through electrochemical testing and the water drop test (WDT) method. The results indicate that in a 3.5 wt% NaCl solution, the Sn58Bi alloy exhibits a higher corrosion current density and a narrower passivation range compared to other solder alloys, resulting in a faster corrosion rate. The loose and porous flaky corrosion products formed on the surface after corrosion cannot effectively block the penetration of Cl⁻ ions, thereby accelerating the corrosion process. During the ECM process, the Sn phase in the Sn58Bi alloy rapidly dissolves due to the electrochemical coupling effect, generating a large number of Sn²⁺ ions at the anode. Concurrently, a limited number of bubbles emerge on the cathode due to the elevated hydrogen evolution overpotential of Bi, thereby furnishing a plentiful array of active sites for the deposition of tin ions. These factors serve to stimulate the formation and growth of dendrites. Consequently, the short-circuit failure time of the Sn58Bi alloy is a mere 23 s, which is significantly lower than that of other alloys. This indicates that the Sn58Bi alloy exhibits poor resistance to ECM.

在湿度和含盐量高的恶劣环境中，焊点容易受到湿气和污染物的腐蚀。这对焊料合金的长期可靠性提出了重大挑战。本研究通过电化学测试和水滴试验（WDT）方法，系统研究了Sn58Bi与Sn37Pb、Sn0.7Cu和Sn3Ag0.5Cu钎料合金的耐蚀性和电化学迁移（ECM）行为。结果表明，在3.5 wt% NaCl溶液中，Sn58Bi合金具有较高的腐蚀电流密度和较窄的钝化范围，腐蚀速率较快；腐蚀后表面形成松散多孔的片状腐蚀产物，不能有效阻挡Cl−离子的渗透，从而加速腐蚀过程。在ECM过程中，由于电化学耦合效应，Sn58Bi合金中的Sn相快速溶解，在阳极处产生大量Sn2+离子。同时，由于Bi的析氢过电位升高，阴极上出现了有限数量的气泡，从而为锡离子的沉积提供了丰富的活性位点。这些因素有助于刺激树突的形成和生长。因此，Sn58Bi合金的短路失效时间仅为23 s，明显低于其他合金。这表明Sn58Bi合金的抗电蚀性较差。

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引用次数: 0

FeOOH as template for synthesizing bimetallic sulfide-MOF heterostructures for efficient overall water splitting FeOOH作为模板用于合成双金属硫化物- mof异质结构的高效整体水裂解

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-19 DOI: 10.1016/j.jelechem.2025.119666

Yuying Yang, Qiannan Sun, Daying Xu, Min Zhou, Wenhui Zhang, Yihan Li, Zhongai Hu

This study reports the fabrication and electrocatalytic performance of a MOF-derived Co/Fe bimetallic sulfide electrocatalyst with a unique hierarchical heterostructure. A self-supported Fe₉S₁₀/Co₃S₄-MOF@NF catalyst, featuring interlaced nanosheets anchored on nickel foam (NF), was successfully synthesized via a sequential hydrothermal approach combined with low-temperature sulfuration. The FeOOH nanosheets grown in situ on NF as a dual-function template: not only do they enable the uniform growth of MOF arrays, but they also serve as a Fe source, participating in the formation of bimetallic sulfides while ensuring a large specific surface area. The resulting structure integrates well-defined hierarchical nanosheets with partially untransformed MOF frameworks, which synergistically provide efficient charge transfer pathways, abundant active sites, and enhanced structural stability. Electrochemical tests demonstrate that Fe₉S₁₀/Co₃S₄-MOF@NF exhibits exceptional catalytic activity for both hydrogen evolution reaction (HER) (η₁₀ = 49 mV) and oxygen evolution reaction (OER) (η₁₀ = 222 mV) under alkaline conditions. Notably, the electrolytic cell Fe₉S₁₀/Co₃S₄-MOF@NF | | Fe₉S₁₀/Co₃S₄-MOF@NF as both anode and cathode achieves a remarkably low decomposition voltage of 1.52 V at 10 mA cm⁻² and maintains excellent stability. This work presents a novel template-guided strategy for constructing bimetallic sulfide-MOF heterostructures, offering insights into the design of high-performance electrocatalysts for efficient overall water splitting.

本研究报道了mof衍生的Co/Fe双金属硫化物电催化剂的制备及其电催化性能。采用顺序水热法和低温硫化相结合的方法，成功地合成了具有交错纳米片锚定在泡沫镍（NF）上的自支撑Fe9S10/Co3S4-MOF@NF催化剂。在NF上原位生长的FeOOH纳米片作为双重功能模板：它们不仅可以使MOF阵列均匀生长，而且还可以作为Fe源，参与双金属硫化物的形成，同时确保大的比表面积。所得到的结构集成了定义良好的分层纳米片和部分未转化的MOF框架，它们协同提供了有效的电荷转移途径，丰富的活性位点和增强的结构稳定性。电化学测试表明，Fe9S10/Co3S4-MOF@NF在碱性条件下对析氢反应（HER）（η10 = 49 mV）和析氧反应（OER）（η10 = 222 mV）均表现出优异的催化活性。值得注意的是，电解池Fe9S10/Co3S4-MOF@NF | | Fe9S10/Co3S4-MOF@NF作为阳极和阴极，在10 mA cm - 2下获得了1.52 V的极低分解电压，并保持了良好的稳定性。这项工作提出了一种新的模板引导策略来构建双金属硫化物- mof异质结构，为高效整体水分解的高性能电催化剂的设计提供了见解。

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引用次数: 0

Electrodeposited nano-flower like NiCo-LDH as a superior pseudo-capacitive electrode material for supercapacitors 电沉积纳米花状NiCo-LDH作为超级电容器的优良赝电容电极材料

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-19 DOI: 10.1016/j.jelechem.2025.119664

Harishitha Ragunathan, Pavithra Dhandapani, Prasant Kumar Nayak, Arthanareeswari Maruthapillai

Layered double hydroxides (LDH) are promising electrode materials for supercapacitors, because of their high specific capacitance, better electronic conductivity and good cycling stability. At present, nickel cobalt based LDH are investigated due to high synergistic effects like high electrical conductivity and cycling stability for the development of pseudo-capacitive materials. Among various synthesis methods, facile electrodeposition method is an effective technique to prepare binder free high purity and conductive materials in less time duration. Highlighting this, we demonstrate here a simple one-step galvanostatic electrodeposition method to prepare NiCo-LDH on nickel foam and compared its pseudo-capacitive performance with either Ni hydroxides or Co hydroxides. The surface morphology characterization by scanning electron microscopy confirms that the layered double hydroxides are formed with nanoflower like morphology. The electrochemical active surface area and the diffusion coefficients of the NiCo-LDH electrode are found to be 4.88 cm² and 7.3 × 10⁻⁴ cm² s⁻¹ (anodic) and 3.6 × 10⁻⁴ cm² s⁻¹ (cathodic), respectively. Interestingly, the NiCo-LDH provide a high specific capacitance of 808 F g⁻¹ (363C g⁻¹) compared to 304 F g⁻¹ (136C g⁻1) for α-Co(OH)₂, when cycled at 1 A g⁻¹ in 1 M KOH solution. It also demonstrates better cycling stability, retaining about 61 % of its capacitance after 3000 cycles. In contrast, α-Ni(OH)₂ and α-Co(OH)₂ retain only about 54 % and 74 % of their capacitance, respectively after 3000 cycles, when cycled at 5 A g⁻¹. Additionally, NiCo-LDH can provide 429 F g⁻¹ compared to 304 F g⁻¹ for Ni(OH)₂ when cycled at 10 A g⁻¹, showing its better rate performance. Therefore, the electrodeposited NiCo-LDH can be a promising electrode material for supercapacitors.

层状双氢氧化物（LDH）具有比电容高、导电性好、循环稳定性好等优点，是一种很有前途的超级电容器电极材料。目前，镍钴基LDH由于具有高导电性和循环稳定性等高协同效应而被研究用于伪电容材料的开发。在各种合成方法中，简便电沉积法是在较短时间内制备无粘结剂、高纯度导电材料的有效方法。为了强调这一点，我们在这里展示了一种简单的一步恒流电沉积方法，在泡沫镍上制备NiCo-LDH，并比较了其与氢氧镍或氢氧钴的赝电容性能。通过扫描电镜对表面形貌进行表征，证实了层状双氢氧化物的形成具有纳米花状形貌。NiCo-LDH电极的电化学活性表面积和扩散系数分别为4.88 cm2和7.3 × 10−4 cm2 s−1（阳极）和3.6 × 10−4 cm2 s−1（阴极）。有趣的是，NiCo-LDH在1 M KOH溶液中以1 a g−1循环时，α-Co(OH)2的比电容为808 F g−1 (363C g−1)，而α-Co(OH)2的比电容为304 F g−1 （136C g−1）。它还表现出更好的循环稳定性，在3000次循环后保持约61%的电容。相比之下，α-Ni(OH) 2和α-Co(OH) 2在5 A g−1下循环3000次后，分别仅保留约54%和74%的电容。此外，NiCo-LDH在10 A g−1下循环时，Ni(OH)2可以提供429 F g−1，而Ni(OH)2可以提供304 F g−1，显示出更好的速率性能。因此，电沉积NiCo-LDH是一种很有前途的超级电容器电极材料。

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引用次数: 0

Modulation of charged chemical transport by electrostatic forces in polyelectrolyte hydrogels 聚电解质水凝胶中静电力对带电化学输运的调制

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-17 DOI: 10.1016/j.jelechem.2025.119662

Jaeeun Son , Seunghyeok Baek , Seongpil Hwang , Changsuk Yun

Polyelectrolyte hydrogels are promising electrolytic media for interfacing soft biological systems with electronics. We investigated how fixed charges in 2-acrylamido-2-methyl-1-propane sulfonate (AMPS⁻) and (3-acrylamidopropyl)trimethylammonium (APTQ⁺) hydrogels affect steady-state currents (I_SS) of ferricyanide (Fe(CN)₆³⁻) and hexaammineruthenium(III) (Ru(NH₃)₆³⁺) measured at Au and carbon ultramicroelectrodes (UMEs) under varying ionic strengths. Ferricyanide showed significantly suppressed current in APTQ⁺ gels due to electrostatic attraction and partial immobilization, but remained mobile in AMPS⁻ gels. UV–Vis spectra confirmed the distribution trends of Fe(CN)₆³⁻ within the gels, supporting the electrochemical findings. In contrast, the positively charged Ru(NH₃)₆³⁺ displayed reduced mobility in AMPS⁻ gels and relatively free diffusion in APTQ⁺ gels. Adjusting NaCl concentration modulated electrostatic screening and thus probe transport. These results demonstrate that fixed charge interactions within hydrogels can critically influence ion diffusion and redox activity. This must be carefully considered in the design of hydrogel-based systems for sensing, energy storage, and bioelectronic applications.

聚电解质水凝胶是一种很有前途的连接软生物系统和电子器件的电解介质。我们研究了2-丙烯酰胺-2-甲基-1-丙烷磺酸盐（AMPS−）和（3-丙烯酰胺丙基）三甲基铵（APTQ+）水凝胶中的固定电荷如何影响铁氰化物（Fe(CN)63−）和六胺矿铵（III）（Ru(NH3)63+）在不同离子强度下在Au和碳超微电极（me）上的稳态电流（ISS）。铁氰化物在APTQ+凝胶中由于静电吸引和部分固定化表现出明显的电流抑制，但在AMPS−凝胶中保持移动。紫外可见光谱证实了Fe(CN)63−在凝胶中的分布趋势，支持了电化学研究结果。相反，带正电的Ru(NH3)63+在AMPS−凝胶中的迁移率降低，在APTQ+凝胶中的扩散相对自由。调节NaCl浓度可调节静电筛选，从而调节探针传输。这些结果表明，水凝胶内的固定电荷相互作用对离子扩散和氧化还原活性有重要影响。在设计用于传感、储能和生物电子应用的基于水凝胶的系统时，必须仔细考虑这一点。

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引用次数: 0

Photo- and electro- catalytic insights into H2O2 production using ferrite structure 光催化和电催化利用铁氧体结构生产H2O2的见解

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-11-17 DOI: 10.1016/j.jelechem.2025.119661

Ren Hirayama , Kosei Ito , Toi Kawakami , Mizuki Irizawa , Takuya Suzuki , Takao Gunji

Hydrogen peroxide (H₂O₂), currently produced by the anthraquinone process, has a significant environmental impact. In contrast, the photocatalytic production of H₂O₂ offers several advantages such as safety, non-polluting operation, and energy savings. However, the production yield is limited, and hence, developing a superior H₂O₂ production technique via photocatalysis is essential. This study focused on CuFe₂O₄ and CoFe₂O₄ with ferrite structures capable of the electrochemical oxygen reduction reaction. To improve H₂O₂ production, we used these ferrites as co-catalysts mixed with TiO₂ for photocatalysis. The synthesized co-catalysts were characterized by XRD, SEM, EDS, and HR-STEM analyses. In the photocatalytic reaction, with acetic acid as a sacrificial agent, the H₂O₂ production using CuFe₂O₄/TiO₂ was approximately 16 times higher than that using TiO₂ alone. This enhancement was attributed to the co-catalyst promoting the two-electron reduction of O₂ and functioning as an electron pool. This study provides a pathway for developing more sustainable and efficient production methods for H₂O₂, with broad implications for environmental protection and industrial practices.

过氧化氢（H2O2）目前由蒽醌法产生，对环境有重大影响。相比之下，光催化生产H2O2具有安全、无污染、节能等优点。但是，由于产率有限，因此必须开发光催化制氢技术。本文主要研究具有铁素体结构的CuFe2O4和CoFe2O4的电化学氧还原反应。为了提高H2O2的产量，我们将这些铁氧体与TiO2混合作为共催化剂进行光催化。采用XRD、SEM、EDS、HR-STEM等方法对合成的共催化剂进行了表征。在以乙酸为牺牲剂的光催化反应中，CuFe2O4/TiO2的H2O2产率比单独使用TiO2的H2O2产率高约16倍。这种增强归因于共催化剂促进了O2的双电子还原，并起到了电子池的作用。该研究为开发更可持续、更高效的H2O2生产方法提供了一条途径，对环境保护和工业实践具有广泛的意义。

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