Electrochimica Acta最新文献_第2页

Electrochemical and Compositional Insights into Early-Stage Corrosion Behavior of High-Mn Steel Microalloyed with Cr, Mo, and V in 3.5% NaCl Solution Cr、Mo、V微合金化高锰钢在3.5% NaCl溶液中早期腐蚀行为的电化学和成分研究

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-06-20 DOI: 10.1016/j.electacta.2025.146744

Aasiya S. Jamadar, Rupesh S. Pedanekar, Sang Chul Lee, Sung Jin Kim

{"title":"Electrochemical and Compositional Insights into Early-Stage Corrosion Behavior of High-Mn Steel Microalloyed with Cr, Mo, and V in 3.5% NaCl Solution","authors":"Aasiya S. Jamadar, Rupesh S. Pedanekar, Sang Chul Lee, Sung Jin Kim","doi":"10.1016/j.electacta.2025.146744","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146744","url":null,"abstract":"Early-stage corrosion product formation governs the long-term performance of high-Mn steels in chloride environments, yet quantitative insights into this critical stage remain limited. To elucidate the individual and synergistic effects of Cr, Mo, and V, two alloys, MoV and CrMoV, were immersed in 3.5 wt% NaCl solution and analyzed during early immersion. Electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) revealed that CrMoV achieved a peak polarization resistance of 2897 Ω cm2 at 12 h, which was 72% higher than that of MoV (1685 Ω cm2 at 6 h), while reducing the corrosion current density from 1.35 to 0.45 µA cm−2. Mott-Schottky analysis further indicated a 21% decline in defect density (from 7.2 × 1017 to 5.8 × 1017 cm−3 over 24 h), along with the emergence of mixed p-type and n-type semiconducting behavior. Cr-induced pseudo-passivation in the CrMoV alloy was primarily responsible for enhancing corrosion resistance and reducing metal dissolution, resulting in a thinner oxide layer than in MoV, as confirmed by FE-SEM and GDS analyses. XPS depth profiling revealed increasing Cr2O3 content over time and the formation of FeCr2O4 in the inner oxide layer by 12 h. Mo primarily reduced defect density, while V contributed to film thickening and uniformity. These synergistic effects improved early-stage corrosion resistance by up to 65%, offering practical guidance for designing corrosion-resistant high-Mn steels in marine applications.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"608 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Surface-Area α-MnO2 Promotes Efficient Mn Deposition to Mitigate Capacity Fading in Aqueous Zn-Ion Batteries 高表面积α-MnO2促进有效的Mn沉积，以减轻水性锌离子电池的容量衰退

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-06-20 DOI: 10.1016/j.electacta.2025.146742

Ningshuang Zhang, Jingxuan Yan, Mengya Wang, Xiaohua Li, Haitao Shen, Miaomiao Lv, Meiling Wu, Jiawen Zhang, Shiyou Li

{"title":"High-Surface-Area α-MnO2 Promotes Efficient Mn Deposition to Mitigate Capacity Fading in Aqueous Zn-Ion Batteries","authors":"Ningshuang Zhang, Jingxuan Yan, Mengya Wang, Xiaohua Li, Haitao Shen, Miaomiao Lv, Meiling Wu, Jiawen Zhang, Shiyou Li","doi":"10.1016/j.electacta.2025.146742","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146742","url":null,"abstract":"The capacity decays of MnO2 caused by its irreversible structural changes and volume expansion is a thorny problem for aqueous zinc-ion batteries (AZIBs), which can be accelerated by the inevitable dissolution of Mn. Herein, a 3D hollow urchin-like α-MnO2 (HUM) with a high Young's modulus of 27.8 Mpa was prepared, which can effectively relieve the stress accumulated by volume expansion of MnO2 during cycling. As a result, HUM delivers a cycle life of up to 1000 cycles at a current density of 500 mA g-1, which is about 5.17 times longer than that of ordinary nanotubes α-MnO2 (NAM). The large specific surface area (137.4 cm3 g-1) of HUM makes it showing more active sites, which can promote the uniform deposition of dissolved Mn2+ and efficiently conversion between Mn2+ and MnO2. Hence, HUM shows an enhanced initial capacity of 345.7 mA h g-1 compared with that of 142.2 mA h g-1 for NAM. In this work, we also investigated the two pH-controlled charge storage mechanisms and related evolutions of phase transition during charge/discharge to emphasize the importance of Mn2+ and Zn4SO4(OH)6·xH2O, aiming to bring new insights into future studies on the commercialization of α-MnO2-based AZIBs.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"66 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fe/N/C spheres synthesized by sol-gel method exhibiting high oxygen reduction catalytic activity in microbial fuel cells 溶胶-凝胶法制备的Fe/N/C微球在微生物燃料电池中具有高氧还原催化活性

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-06-19 DOI: 10.1016/j.electacta.2025.146676

Ting Huang, Ming Shen, Yongcai Zhang, Enren Zhang

{"title":"Fe/N/C spheres synthesized by sol-gel method exhibiting high oxygen reduction catalytic activity in microbial fuel cells","authors":"Ting Huang, Ming Shen, Yongcai Zhang, Enren Zhang","doi":"10.1016/j.electacta.2025.146676","DOIUrl":"10.1016/j.electacta.2025.146676","url":null,"abstract":"<div><div>The development of low-cost and high-efficiency oxygen reduction reaction (ORR) catalysts in air-cathodes is essential for advancing microbial fuel cells (MFCs) into practical systems for harvesting electrical energy from low-energy-density media. In this study, Fe/N/C hollow spheres with a hierarchical mesoporous shell structure were synthesized using phenolic resin spheres as precursors, prepared via a sol-gel method. The innovative synthesis retains the precursor morphology and skeleton structure, while ZnCl2 activation and Fe doping endow the material (i.e. A-Fe/N/C) with excellent ORR activity comparable to that of commercial Pt/C in air cathodes. Loading 2 mg cm−2 of A-Fe/N/C in the air cathode allowed the single-chamber MFCs to achieve a maximum power density of 0.421 mW cm−2. Notably, A-Fe/N/C showed higher catalytic stability and better toxicity tolerance than Pt/C in long-term MFC operations. This study provides a promising catalyst option for the development of practical air cathodes for MFCs, featuring a low-cost synthesis approach that retains precursor morphology and skeleton structure while enabling excellent ORR activity.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"536 ","pages":"Article 146676"},"PeriodicalIF":5.5,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hollow double-shell Co3O4@CoNiSx p-n heterojunction for enhanced visible light-assisted methanol electrocatalytic oxidation 中空双壳Co3O4@CoNiSx p-n异质结增强可见光辅助甲醇电催化氧化

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-06-19 DOI: 10.1016/j.electacta.2025.146735

Guanfeng Li, Lei Qian, Meng Li, Dandan Wang, Lingling Yang, Rong-Fu Huang

{"title":"Hollow double-shell Co3O4@CoNiSx p-n heterojunction for enhanced visible light-assisted methanol electrocatalytic oxidation","authors":"Guanfeng Li, Lei Qian, Meng Li, Dandan Wang, Lingling Yang, Rong-Fu Huang","doi":"10.1016/j.electacta.2025.146735","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146735","url":null,"abstract":"Accelerating the separation of photogenerated carriers and improving the diffusion efficiency of reactants is an effective way to improve the photoelectric catalytic activity of catalysts. In this report, a dual-scale optimization strategy combining atomic-scale built-in electric field construction with molecular-level hollow structure construction was proposed to enhance the visible photo-assisted methanol electrocatalytic oxidation activity of cobalt nickel based non-noble metal catalysts. Using ZIF-67 as self-sacrifice template, through a three-steps strategy containing cation exchange, L-cysteine controlled etching, and high-temperature calcination, double-shell Co3O4@CoNiSx nanocage was synthesized. The p-n junction formed between the inner shell (p type semiconductor Co3O4) and outer shell (n type semiconductor CoNiSx) can effectively accelerate the separation of photogenerated carriers, and the hollow structure can improve the light adsorption and accelerate the diffusion of the reactants. The photoresponse current density of Co3O4@CoNiSx (1.12 A g-1) for visible light-assisted methanol electrocatalytic oxidation was two times and three times higher than that of single shell Co3O4@CoNiOx and single component Co3O4. The dual-scale optimization strategy proposed in this report will be a general pathway for enhancing the photo-electrocatalytic activity of non-noble metal based photo-electro catalyst.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"12 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrochemical capacitors with lithium chloride/polyvinyl alcohol solid polymer electrolyte for ionotronic-based thermal sensors 离子电子热传感器用氯化锂/聚乙烯醇固体聚合物电解质电化学电容器

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-06-19 DOI: 10.1016/j.electacta.2025.146740

Libu Manjakkal, Chandini Kumar, Mustehsan Beg, Amith Mathew, Jeeva Saju, Febin Paul, Prasutha Rani Markapudi

{"title":"Electrochemical capacitors with lithium chloride/polyvinyl alcohol solid polymer electrolyte for ionotronic-based thermal sensors","authors":"Libu Manjakkal, Chandini Kumar, Mustehsan Beg, Amith Mathew, Jeeva Saju, Febin Paul, Prasutha Rani Markapudi","doi":"10.1016/j.electacta.2025.146740","DOIUrl":"10.1016/j.electacta.2025.146740","url":null,"abstract":"<div><div>This paper describes an ionotronic-based sensor that can detect changes in temperature using a solid polymer electrolyte (SPE)-based transparent electrochemical capacitor (EC). The EC developed using flexible ITO as an active electrode and polyvinyl alcohol (PVA)- lithium chloride (LiCl) gel composite-based SPE. The electrochemical performances of the sensors are investigated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charging and discharging (GCD) analysis. The EC was fabricated using a freestanding SPE, which exhibits a specific capacitance of 4.19 μF. cm-² at a scan rate of 5 mV. s-1. The direct coating of the SPE on the electrode enhances the specific capacitance and is found to be 18.70 μF.cm-², which is 12 times higher than the EC fabricated using freestanding SPE. When a temperature was applied to the top of the EC with directly coated SPE, we observed a variation in the device’s capacitance due to the change in the mobility of ions of the SPE, which is directly related to the temperature change. The EC exhibits a sensitivity of 0.30 µF/ °C (R2= 0.9694) for the temperature range of -10 to 50 °C. Due to its ionic reaction, the EC demonstrates a high capacitance value in the range of µF in the low frequency range, which shows its potential application in ionotronic-based sensing and as an energy storage for the next generation of wearable devices.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"536 ","pages":"Article 146740"},"PeriodicalIF":5.5,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Feature-driven machine learning screening of sodium-ion battery electrodes to support large-scale energy storage 特征驱动的机器学习筛选钠离子电池电极，以支持大规模能量存储

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-06-19 DOI: 10.1016/j.electacta.2025.146734

Hong Qian, Zhong Tang, Yuhao Liu, Xiangyang Liu, Binxia Yuan

{"title":"Feature-driven machine learning screening of sodium-ion battery electrodes to support large-scale energy storage","authors":"Hong Qian, Zhong Tang, Yuhao Liu, Xiangyang Liu, Binxia Yuan","doi":"10.1016/j.electacta.2025.146734","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146734","url":null,"abstract":"This study combines the Materials Genome Initiative (MGI) and machine learning to explore the screening and performance prediction of sodium-ion battery cathode materials, contributing to the development of large-scale energy storage. By performing feature importance analysis, three models (model #1, model #2, and model #3) are constructed using 21, 5, and 1 input features, respectively, to represent different stages of the electrode material screening process. Using PCA and weighting methods, the output feature ACE (average voltage, specific capacity, specific energy) is constructed to describe the overall performance of energy storage batteries. This method enables an approximate evaluation of the overall battery performance (as represented by the ACE feature) from a single, easily accessible input, making it suitable for early-stage screening, significantly enhancing machine learning efficiency while maintaining high accuracy and robustness. Furthermore, this paper discusses selecting ACE weights for different grid energy storage applications and designing specific output feature weight ratios for grid energy storage and frequency regulation. In the forward application, four promising electrode materials are identified, while in the reverse application, the model helps define the input feature range for designing new materials.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"11 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unveiling the Advancements in Electrochemical Performance of PCN-777/ReSe2@LiO2 for Asymmetric Supercapacitors and Electrochemical Hydrogen Production 非对称超级电容器PCN-777/ReSe2@LiO2电化学性能及电化学制氢研究进展

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-06-19 DOI: 10.1016/j.electacta.2025.146741

M. Alharbi, Muhammad Waqas Iqbal, Yas Al-Hadeethi, Ehtisham Umar, Sondos Khayyat

{"title":"Unveiling the Advancements in Electrochemical Performance of PCN-777/ReSe2@LiO2 for Asymmetric Supercapacitors and Electrochemical Hydrogen Production","authors":"M. Alharbi, Muhammad Waqas Iqbal, Yas Al-Hadeethi, Ehtisham Umar, Sondos Khayyat","doi":"10.1016/j.electacta.2025.146741","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146741","url":null,"abstract":"This study pioneers the development of a novel composite electrode material, integrating PCN-777 MOF, ReSe2 nanosheets, and LiO2 dopants to exploit their synergistic properties. ReSe2, a transition metal dichalcogenide, addresses the inherent poor conductivity of MOFs by acting as an efficient electron mediator due to its narrow bandgap and high electrical conductivity. The PCN-777 MOF provides an ideal scaffold, leveraging its large pore volume and high surface area to facilitate ion transport and disperse active sites, thereby enhancing charge storage capabilities. The incorporation of LiO2 further boosts pseudocapacitive behavior and the reversibility of redox reactions by introducing additional redox-active sites and accelerating ion diffusion kinetics. To our knowledge, this is the first exploration of such a tripartite synergy in a single composite electrode for enhanced electrochemical performance. In asymmetric supercapacitor (ASC) configuration (PCN-777/ReSe2@LiO2//AC), the hybrid device reached maximum specific capacity (Qs) of 259 C/g at 1.0 A/g. The PCN-777/ReSe2@LiO2//AC device demonstrated an impressive power density (Pd) of 974 W/kg and attained a maximum energy density (Ed) of 82.5 Wh/kg. Additionally, it exhibited exceptional cyclic stability, retaining 88.2% of its initial capacitance after 12,000 charge-discharge cycles. In the context of hydrogen evolution reaction (HER), the PCN-777/ReSe2@LiO2 electrode exhibited a notably low overpotential of 89.7 mV, along with a favorable Tafel slope of 56.7 mV/dec. These exceptional electrochemical characteristics underscore the potential of this hybrid material as a highly promising candidate for both energy storage and HER-related applications.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"12 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scalable synthesis of processable high performance O3-NaNi0.4Mn0.4Fe0.2O2: a methodological investigation and electrochemical Insights 可加工高性能O3-NaNi0.4Mn0.4Fe0.2O2的可扩展合成：方法学研究和电化学见解

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-06-19 DOI: 10.1016/j.electacta.2025.146738

Elena Gonzalo, Lander Rodriguez-Castaño, Yawen He, Jorge Martinez de Argote Añon, Montse Galceran, Aitor Villaverde, Marta Cabello, Nicholas E. Drewett

{"title":"Scalable synthesis of processable high performance O3-NaNi0.4Mn0.4Fe0.2O2: a methodological investigation and electrochemical Insights","authors":"Elena Gonzalo, Lander Rodriguez-Castaño, Yawen He, Jorge Martinez de Argote Añon, Montse Galceran, Aitor Villaverde, Marta Cabello, Nicholas E. Drewett","doi":"10.1016/j.electacta.2025.146738","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146738","url":null,"abstract":"The O3-NaNi0.4Mn0.4Fe0.2O2 (NaNMF442) cathode material was synthesised using a scalable coprecipitation and calcination process, yielding a high-purity and crystalline material well-suited for sodium ion batteries. Electrochemical properties were investigated using sodium metal anode counter electrodes and the cells were found to give a capacity of 140.5 mAh g-1, an average voltage of 3.17 V vs. Na+/Na, and an energy density of 445.4 Wh Kg-1 at a (dis)charge rate of 24 mA g-1, and 118.8 mAh g-1, 3.1 V vs. Na+/Na, and 316.8 Wh Kg-1 at 240 mA g-1. Further testing in proof-of-concept full cells against commercial hard carbon counter electrodes, followed by a comprehensive post-cycling analysis, revealed that the half cell performance had been limited by electrolyte decomposition. This was attributed to side reaction with the sodium metal, highlighting the importance of a holistic analysis of all cell components, from synthesis to post-cycling, in order to ensure a comprehensive understanding of material performance. These results demonstrate the promising nature of the sodium nickel-manganese-iron layered oxide family, in particular those based on the NaNMF442 stoichiometry, as high-performance cathode materials with good rate capability for sodium ion batteries.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"15 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Single-Walled Carbon Nanohorns decorated with Silver Nanostructures as an Enhanced Voltammetric Platform for Nitrate Monitoring 银纳米结构修饰的单壁碳纳米角作为硝酸盐监测的增强伏安平台

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-06-19 DOI: 10.1016/j.electacta.2025.146739

Bryan Pichún, Fabiana Liendo, Amaya Paz de la Vega, Johisner Penagos, Jaime Pizarro, Rodrigo Segura, María Jesús Aguirre

{"title":"Single-Walled Carbon Nanohorns decorated with Silver Nanostructures as an Enhanced Voltammetric Platform for Nitrate Monitoring","authors":"Bryan Pichún, Fabiana Liendo, Amaya Paz de la Vega, Johisner Penagos, Jaime Pizarro, Rodrigo Segura, María Jesús Aguirre","doi":"10.1016/j.electacta.2025.146739","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146739","url":null,"abstract":"Accurate and selective detection of nitrate is essential due to the environmental and health risks posed by excessive nitrate levels in water supplies. In this work, a novel electrochemical sensor for nitrate detection is presented, based on a glassy carbon electrode (GCE) modified with single-walled carbon nanohorns (SWCNHs) and electrochemically synthesized silver nanostructures (AgNSs). The combination of SWCNHs and AgNSs (AgNSs/SWCNHs/GCE) enhances the electrochemically active surface area (ECSA) of the sensor compared to AgNSs/GCE, resulting in superior sensitivity for nitrate analysis. The performance of the sensor was evaluated by square wave voltammetry (SWV) and characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and cyclic voltammetry (CV). Under optimized conditions: 2.0 μL of 1.0 mg mL-1 SWCNHs on the GCE and a 2-second electrodeposition of AgNSs at -0.8 V vs. saturated calomel electrode (SCE), the sensor exhibited a linear response to nitrate concentrations ranging from 0.2 to 100.0 mg L-1, with a detection limit of 0.17 mg L-1. The sensor demonstrated excellent repeatability, reproducibility, strong anti-interference with common ions (NO₂⁻, NH₄⁺, Cl⁻, ClO₄⁻, Mg²⁺, K⁺, Na⁺), and was successfully applied to nitrate detection in tap water, showing consistent and reliable results. This study highlights the potential of the developed sensor for environmental monitoring and water quality analysis.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"12 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Zn-doped NiS2 wrapped by RGO nanosheets revealing improved electrochemical performances for supercapacitor application 由氧化石墨烯纳米片包裹的锌掺杂NiS2揭示了超级电容器应用中改进的电化学性能

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-06-18 DOI: 10.1016/j.electacta.2025.146733

Wei Xiong , Weiyang Zhang , Chunyan Sun , Hongwei Kang , Xiaona Li , Zhikun Li

{"title":"Zn-doped NiS2 wrapped by RGO nanosheets revealing improved electrochemical performances for supercapacitor application","authors":"Wei Xiong , Weiyang Zhang , Chunyan Sun , Hongwei Kang , Xiaona Li , Zhikun Li","doi":"10.1016/j.electacta.2025.146733","DOIUrl":"10.1016/j.electacta.2025.146733","url":null,"abstract":"<div><div>Designing low-cost, high-performance electrodes are critical for assembling efficient energy storage devices. Herein, we have designed Zn-doped NiS2 heterostructures wrapped by reduced graphene oxide (RGO) nanosheets via a facile hydrothermal route, and investigated their (ZNSRs) electrochemical energy storage properties. Hierarchical porous interconnected RGO nanosheets with high specific surface area and excellent conductivity not only provide good charge/ion fast transfer channels, thereby improving the reaction kinetics, but also promote the dispersion of zinc-nickel sulfide nanoparticles, thus improving the utilization of zinc-nickel sulfide with high specific capacity property. Meanwhile, the Zn-doped to form zinc-nickel sulfide heterostructure can improve the electrochemical reactivity of the nickel sulfide electrode, which can be beneficial to synergistically improve the energy storage properties. The test results show that the fabricated ZNSRs electrodes exhibit excellent energy storage performances. The optimal ZNSR-0.3 electrode not only exhibits a high specific capacity of 221.7 mAh g−1 at 0.8 A g−1, but also the hybrid supercapacitor assembled with the designed RAC negative electrode also delivers a high energy density of 45.1 Wh kg−1 (at power density of 603.9 W kg−1) and excellent long-term cycling stability (80.67 % capacity retention after 22,000 cycles). The fabricated ZNSR-0.3 electrode is demonstrated to be a promising alternative electrode in efficiency hybrid supercapacitor application.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"536 ","pages":"Article 146733"},"PeriodicalIF":5.5,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0