Electrochimica Acta最新文献

Nb - doping induces crystallization of coprecipitation particles to achieve high performance sodium-ion batteries cathode materials 铌掺杂诱导共沉淀颗粒结晶，获得高性能钠离子电池正极材料

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-07-04 DOI: 10.1016/j.electacta.2025.146798

Zhihong Xiao , Xiangze Kong , Yujia Wang , Yunyao Chen , Kai Liu , Qingyin Zhang , Guifang Zhang , Zhiqiang Shi

{"title":"Nb - doping induces crystallization of coprecipitation particles to achieve high performance sodium-ion batteries cathode materials","authors":"Zhihong Xiao , Xiangze Kong , Yujia Wang , Yunyao Chen , Kai Liu , Qingyin Zhang , Guifang Zhang , Zhiqiang Shi","doi":"10.1016/j.electacta.2025.146798","DOIUrl":"10.1016/j.electacta.2025.146798","url":null,"abstract":"<div><div>Sodium-ion batteries (SIBs) are considered as one of the most competitive candidates for energy storage systems. While O3-type NaNi0.5Mn0.5O2 cathode materials offer high theoretical capacity and operating voltage, their practical application is hindered by irreversible phase transitions during Na+ extraction/insertion that degrade structural stability and reaction kinetics. This study synthesizes Nb-doped O3-Na[Ni0.5Mn0.5]1-xNbxO2 (x = 0,0.01,0.02,0.03) through ball milling assisted coprecipitation. Nb doping enhances lattice stability through two mechanisms: on one hand promoting optimization of coprecipitated particle crystallization, and on the other hand effectively suppressing manganese activity through the formation of mixed cation-oxygen bonds. Na[Ni0.5Mn0.5]0.99Nb0.01O2 exhibits 108.7 mAh g–1 capacity at 0.5C with 77.4 % retention after 200 cycles, demonstrating enhanced cycling stability compared to the undoped material. When paired with hard carbon in full cell, the system achieves >190 Wh kg–1 energy density. Theoretical calculations also elucidate the mechanism by which Nb doping affects the hybridization of Ni-O bonds, stabilizes the structure of the material, and exhibits enhancement in electrochemical properties. This study provides an effective strategy for suppressing the phase transition and advancing the study of the doping mechanism in sodium-ion batteries.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"536 ","pages":"Article 146798"},"PeriodicalIF":5.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557133","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

The Construction of The mOMe-Ir-PI/MWCNTs@PDA/GCE Sensor and Purine Detection in Zebrafish Embryos mOMe-Ir-PI/MWCNTs@PDA/GCE传感器的构建及斑马鱼胚胎嘌呤的检测

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-03 DOI: 10.1016/j.electacta.2025.146754

Saijin Wang, Huiting Mao, Meng Wang, Ximing Cui, Ye Li, Yuxin Cao, Jiazheng Jin, Shi Zhou, Jinlian Li, Guogang Shan

{"title":"The Construction of The mOMe-Ir-PI/MWCNTs@PDA/GCE Sensor and Purine Detection in Zebrafish Embryos","authors":"Saijin Wang, Huiting Mao, Meng Wang, Ximing Cui, Ye Li, Yuxin Cao, Jiazheng Jin, Shi Zhou, Jinlian Li, Guogang Shan","doi":"10.1016/j.electacta.2025.146754","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146754","url":null,"abstract":"Abnormal purine metabolism can result in oxidative stress and endothelial dysfunction, heightening the risks for conditions such as gout and cardiovascular disorders, which may subsequently trigger various physiological dysfunctions. Thus, the rapid and sensitive detection of metabolic abnormalities in purines is crucial for the early diagnosis and prevention of related diseases. Zebrafish has emerged as a popular model organism in metabolic, genetic, and toxicological studies due to its high genetic similarity to humans and the transparency of its embryos, facilitating observation. In this study, we developed a novel electrochemical sensor based on mOMe-Ir-PI/MWCNTs@PDA/GCE to detect purine molecules sensitively. Using this method, we analyzed the electrochemical behavior of zebrafish embryos, correlating the electrochemical signals with X/G and HX/A. Investigating purine metabolism in zebrafish embryos across different developmental stages, we found that from the cleavage stage to the somite formation stage, the activity of degrading enzymes increased, leading to enhanced purine oxidative degradation and the activation of metabolic pathways. This resulted in a decline in purine content, observed as decreasing electrochemical signals. Conversely, from the somite formation stage to hatching, cell differentiation, tissue formation, and organ development accelerated, leading to an increase in purines involved in energy metabolism and biosynthesis, which was reflected in rising electrochemical signals. This study represents the first application of electrochemical methods for detecting purine metabolism in zebrafish embryos throughout various developmental stages, thus providing insights into the role of purine metabolism in early life development.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"36 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547629","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

Composition-Activity Relationship of First-Row Transition Metal Antimonates (MSb2O6, M = Mn, Co, Fe, and Ni) Towards Oxygen Electrocatalysis 第一排过渡金属锑酸盐（MSb2O6, M = Mn, Co, Fe, Ni）对氧电催化的组成-活性关系

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-03 DOI: 10.1016/j.electacta.2025.146828

Walaa Alsaidi, Sami M. Alharbi, Alice Sheppard, David J. Fermin

{"title":"Composition-Activity Relationship of First-Row Transition Metal Antimonates (MSb2O6, M = Mn, Co, Fe, and Ni) Towards Oxygen Electrocatalysis","authors":"Walaa Alsaidi, Sami M. Alharbi, Alice Sheppard, David J. Fermin","doi":"10.1016/j.electacta.2025.146828","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146828","url":null,"abstract":"This study explores the electrocatalytic activity of first-row transition metal antimonates MSb2O6 (M = Mn, Co, Fe, and Ni) towards oxygen reduction (ORR) and oxygen evolution reactions (OER) in alkaline electrolytes. High-phase purity of the various antimonates is achieved by solid-state synthesis at 1000°C. The structure and composition of the oxide powders were examined by X-ray diffraction (XRD), transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM-EDX), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Electrochemical studies conducted in oxygen-saturated electrolytes using a rotating ring-disk electrode demonstrate that MnSb₂O₆ is the only antimonate in the series capable of catalyzing the ORR via the four-electron transfer pathway. On the other hand, CoSb2O6 exhibits the highest activity towards the OER. The activity of these complex materials is closely connected to changes in the population of 3d states associated with the first-row transition metal cation, which can be quantified by the pseudo-capacitive responses at potentials relevant to oxygen electrocatalysis. Our results suggest that populated Mn 3d states have the appropriate configuration to break the O2 bond, while vacant (holes) Co 3d states promote surface-bound OH radicals in the early stages of OER. Normalizing kinetically limited currents for ORR and OER by changes in population of d-states allows for benchmarking the intrinsic activity of catalytic sites in antimonates with other oxide structures, such as lanthanide perovskites.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"3 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547626","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

Linker engineering in covalent organic polymers for enhanced electrocatalytic carbon dioxide reduction 共价有机聚合物中用于增强电催化二氧化碳还原的连接体工程

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-03 DOI: 10.1016/j.electacta.2025.146833

Mengyang Chen, Jie Su, Hongxin Xu, Mao Shen, Yida Zhou, Ping Li, De-Man Han, Shi-Bin Ren

{"title":"Linker engineering in covalent organic polymers for enhanced electrocatalytic carbon dioxide reduction","authors":"Mengyang Chen, Jie Su, Hongxin Xu, Mao Shen, Yida Zhou, Ping Li, De-Man Han, Shi-Bin Ren","doi":"10.1016/j.electacta.2025.146833","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146833","url":null,"abstract":"Covalent organic polymers (COPs) are promising platforms for electrocatalytic carbon dioxide reduction reaction (CO2RR) due to their tunable structures and designable functionality. Among the various structural parameters of COPs, the molecular configuration of linkers plays a critical role in determining catalytic activity. However, studies exploring linker isomerism to modulate the physicochemical properties and catalytic behavior of COPs remain limited. Herein, we reported a linker isomerism strategy to tailor the electronic structure and CO2RR performance of COP-based electrocatalysts. Specifically, COP-o, constructed from 1,10-phenanthroline-2,9-dicarbaldehyde (with ortho-positioned aldehyde groups), exhibited a more favorable cobalt electronic environment and accelerated electron transfer compared to its para-isomeric counterpart, COP-p, derived from 1,10-phenanthroline-4,7-dicarbaldehyde. Theoretical calculations further revealed that COP-o facilitated *COOH adsorption and CO desorption. Consequently, COP-o achieved a CO Faraday efficiency of 98% and a partial CO current density of −12.28 mA cm−2 at −0.76 V (vs. RHE). This work underscores the pivotal role of linker isomerism in modulating the metal coordination environment and electron transfer within the COP frameworks, offering valuable insights for the rational design of highly efficient CO2RR electrocatalysts.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"20 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547368","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

A Sandwich-Type Photoelectrochemical Immunosensor Strategy Based on Anti-Human IgE@ZnS QD-Activated Amplifier for Highly Sensitive IgE Detection 一种基于抗人IgE@ZnS qd激活放大器的三明治型光电化学免疫传感器策略用于高灵敏度IgE检测

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-03 DOI: 10.1016/j.electacta.2025.146829

Yao Cheng, Tengteng Wang, Jie Zhao, Min Zhang, Xu Zhang, Wei Wang, Enze Zhang, Shujun Zhu, Yuhua Chang, Zhaoyan Yu, Zhao Li, Yixiang Song, Dejin Zang

{"title":"A Sandwich-Type Photoelectrochemical Immunosensor Strategy Based on Anti-Human IgE@ZnS QD-Activated Amplifier for Highly Sensitive IgE Detection","authors":"Yao Cheng, Tengteng Wang, Jie Zhao, Min Zhang, Xu Zhang, Wei Wang, Enze Zhang, Shujun Zhu, Yuhua Chang, Zhaoyan Yu, Zhao Li, Yixiang Song, Dejin Zang","doi":"10.1016/j.electacta.2025.146829","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146829","url":null,"abstract":"IgE detection in allergy-related diseases is still a challenge, and the existing clinical detection strategies are expensive and time-consuming, which are difficult to meet the clinical needs. Photoelectrochemical methods, which are developing rapidly, are widely used in the field of biomolecular marker detection because of their reliable performance, convenient operation and low cost. In this study, a highly sensitive photoelectrochemical immunosensor based on zinc sulfide quantum dots (ZnS QDs) modification was developed for IgE detection. ZnS QDs synthesized by hydrothermal method have strong photoelectrochemical reaction ability, and Anti-IgE@ZnS QDs was used as a probe to construct a sandwich sensor on a CS/Au nanoparticle-modified ITO slide. The sensor utilizes the excellent conductivity of ZnS QDs and Au NPs to exhibit good photoelectrochemical (PEC) performance in I3−/I− electrolytes without the need for biotoxic reagents. The linear range of IgE detection is from 1 ng mL−1 to 1☓105 ng mL−1, with a limit of detection of 6.12 ng mL−1 and a limit of quantification of 18.5 ng mL−1. The sensor offers excellent stability, selectivity, and reproducibility for IgE detection. The sensor provides a new method for IgE detection, and its photoelectrochemical platform provides a reference strategy for the detection of other biomolecules.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"27 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547625","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

HYDROGEL-BASED ELECTROCHEMICAL CELLS FOR CARBENDAZIM ANALYSIS USING A MINIATURIZED SENSOR 用于多菌灵分析的微型传感器水凝胶电化学电池

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-03 DOI: 10.1016/j.electacta.2025.146830

Wallace Burger Veríssimo de Oliveira, Gabriela Couto da Silva, Matheus Comastri de Oliveira Leite, Cassiano Cunha de Souza, Thalles Pedrosa Lisboa, Maria Auxiliadora Costa Matos, Renato Camargo Matos

{"title":"HYDROGEL-BASED ELECTROCHEMICAL CELLS FOR CARBENDAZIM ANALYSIS USING A MINIATURIZED SENSOR","authors":"Wallace Burger Veríssimo de Oliveira, Gabriela Couto da Silva, Matheus Comastri de Oliveira Leite, Cassiano Cunha de Souza, Thalles Pedrosa Lisboa, Maria Auxiliadora Costa Matos, Renato Camargo Matos","doi":"10.1016/j.electacta.2025.146830","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146830","url":null,"abstract":"Hydrogels (HG) have emerged as promising materials in electrochemistry due to properties like high water retention, tunable porosity, and excellent ionic conductivity. Their ability to function as solid-state electrolytes and support redox reactions makes them ideal for electroanalytical applications such as biosensors and environmental monitoring. This study focused on synthesizing, characterizing, and applying HG as electrochemical cells for detecting Carbendazim (CBZ) in various matrices. To achieve this, mini-sensors were fabricated using 3D pens and conductive filaments composed of PLA and graphite (3D/PLA-Gr/ME), providing a cost-effective and reproducible platform for electroanalytical applications. The HG structure consisted of polyacrylamide, synthesized in a single step under mild conditions using acrylamide as the monomer, bis-acrylamide as the cross-linking agent, and ammonium persulfate as the polymerization initiator. It was characterized using Fourier Transform Infrared Absorption Spectroscopy (FTIR), Raman Spectroscopy, Cyclic Voltammetry (CV), Scanning Electron Microscopy (SEM), and Energy-Dispersive X-ray Spectroscopy (EDS). The 3D/PLA-Gr/ME mini-sensor was characterized using SEM, CV, and Electrochemical Impedance Spectroscopy (EIS) to assess its structural and electrochemical properties. The HG was immersed in the target solution for a minimum of 8 hours before electrode insertion, enabling the initiation of analysis. The electrochemical behavior of CBZ within the HG was examined using EIS and CV. The optimized Square Wave Voltammetry (SWV) method exhibited a linear working range of 2 to 15 µmol L⁻¹, delivering excellent analytical performance (LD = 0.46 µmol L⁻¹) and high accuracy, with recovery rates between 95% to 105% in food and beverage samples.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"41 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547628","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

Novel Design of Mn3O4-doped Carbon Xerogel Microspheres and their Electrochemical Performance as a High Energy Density Hybrid Supercapacitor 掺杂mn3o4碳干凝胶微球的新设计及其作为高能量密度杂化超级电容器的电化学性能

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-03 DOI: 10.1016/j.electacta.2025.146832

Hesham S. Abdel-Samad, Karim Ahmed Abbas, Hamdy H. Hassan, Abdalla Abdelwahab

{"title":"Novel Design of Mn3O4-doped Carbon Xerogel Microspheres and their Electrochemical Performance as a High Energy Density Hybrid Supercapacitor","authors":"Hesham S. Abdel-Samad, Karim Ahmed Abbas, Hamdy H. Hassan, Abdalla Abdelwahab","doi":"10.1016/j.electacta.2025.146832","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146832","url":null,"abstract":"The improvement of supercapacitor electrodes with substantial energy density is a pivotal necessity in the global transition toward sustainable energy sources. However, the synthesis processes commonly used for producing supercapacitor electrodes based on metal oxide-doped carbon xerogels are associated with extended durations and demonstrate relatively low energy and diminished power density, hindering their practical applicability and large-scale manufacturing. This study aims to fabricate manganese oxide-doped carbon xerogel-based electrodes in a significantly reduced timeframe by utilizing the rapid preparation of carbon xerogel under strong acidic conditions. Additionally, the impact of varying manganese precursor contributions (0.5%, 1%, 2%, 3%, 5%, and 10%) on the morphology and electrochemical characteristics of the samples was investigated. The 1% manganese (CX 1%Mn) sample exhibited the highest BET surface area of 953 m2⋅g-1, resulting in an enhanced capacitive behavior with a specific capacitance of 595 F⋅g −1 at 0.5 A⋅g−1 and a capacitance retention of 95% at a current density of 2 A⋅g −1 after 5000 repetitive cycles. Moreover, a remarkable energy density of 56.75 Wh·kg−1 and a power density of 22.9 kW·kg−1 were attained, accompanied by a significant drop in equivalent series resistance to 0.72 Ω. The Carbon Xerogel prepared with 0.1M HCl and 1%Mn (CX1%Mn) displays enhanced performance due to its excellent morphological features, including high BET surface area, pore volume, and pore diameter. This study presents a straightforward method to prepare manganese oxide-doped carbon xerogel-based supercapacitor electrodes, improving efficiency and upgraded stability. Furthermore, it introduces new opportunities to investigate the effects of various metal oxides based on this novel approach.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"69 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547627","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

Conductive Matrix Architecture of Sulfate-Reducing Bacteria Boosts Coculture Electrical Output 硫酸盐还原菌的导电基质结构提高共培养电输出

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-02 DOI: 10.1016/j.electacta.2025.146826

Muralidharan Murugan, Akihiro Okamoto

{"title":"Conductive Matrix Architecture of Sulfate-Reducing Bacteria Boosts Coculture Electrical Output","authors":"Muralidharan Murugan, Akihiro Okamoto","doi":"10.1016/j.electacta.2025.146826","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146826","url":null,"abstract":"Biogenic iron sulfide nanoparticles (FeS NPs) synthesized by sulfate-reducing bacteria (SRB) are prevalent in anoxic environments. The role these electrically conductive FeS NPs play in microbial interactions, however, remains undefined. We showed interactions between current producing microbes where Desulfovibrio vulgaris Hildenborough, a SRB, utilized FeS NPs to form long-range electron pathways in collaboration with Shewanella oneidensis MR-1, an iron-reducing bacteria. Single-potential amperometry showed synergetic current production associated with biogenic metallic FeS NPs with coculture of D. vulgaris and S. oneidensis compared to pure cultures. The synergetic current production in the coculture was diminished in the absence of biogenic FeS or with a mutant strain of S. oneidensis lacking genes encoding the electron transport pathway of the MtrCAB protein complex. Fluorescent in situ hybridization revealed the formation of cell-NP agglomerations that were twice as thick in cocultures as those from pure cultures, and the cell number of D. vulgaris was enhanced in the presence of S. oneidensis. Cell-NP agglomerations over 15 µm gap source–drain electrodes showed long-range current conduction in the coculture bioagglomerates specifically in the presence of metallic FeS. Additionally, nanoscale secondary ion mass spectroscopy revealed 15N and 13C assimilation, indicating sustained microbial metabolic activity in the cell-NP agglomerations. These data suggest that long-range electric conduction via biogenic FeS NPs enables SRB to cooperate with metabolically compatible partners, potentially activating the anaerobic SRB respiration that drives the global carbon and biogeochemical sulfur cycles.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"19 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144533687","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

Pyrrolidinium- and Imidazolium-stabilized 2,2,6,6-tetramethylpiperidin-1-oxyl nitroxyl radical electrolytes for high-voltage and redox-enhanced nonaqueous supercapacitors 吡啶和咪唑稳定的2,2,6,6-四甲基哌啶-1-氧基硝基自由基电解质用于高压和氧化还原增强的非水超级电容器

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-02 DOI: 10.1016/j.electacta.2025.146820

Wei Sun, Shaoshuai Yu, De Guo, Shuangyi Liu, Zhenhu Li

{"title":"Pyrrolidinium- and Imidazolium-stabilized 2,2,6,6-tetramethylpiperidin-1-oxyl nitroxyl radical electrolytes for high-voltage and redox-enhanced nonaqueous supercapacitors","authors":"Wei Sun, Shaoshuai Yu, De Guo, Shuangyi Liu, Zhenhu Li","doi":"10.1016/j.electacta.2025.146820","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146820","url":null,"abstract":"Nonaqueous organic redox electrolyte-enhanced electrochemical double-layer capacitors (N-ORECs) are promising candidates for high-energy and high-power grid applications. Unlike traditional aqueous ORECs, N-ORECs benefit from a significantly wider electrochemical stability window enabled by organic solvents. However, the electrochemical instability of organic redox electrolytes near marginal potentials restricts window optimization. Here, we develop two stable nitroxide radical-based redox electrolytes by introducing propoxy-linked, electron-conjugated methylimidazolium and methylpyrrolidinium cations into 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) cores and coupling with aluminum-stable BF₄⁻ anions, namely MimP-TBF4 and MpyP-TBF4, respectively. Theoretical calculations confirm that the electron-withdrawing nature of imidazolium and pyrrolidinium cationic groups delocalizes the electron density of the N-O moiety in TEMPO, thereby enhancing the stability of its radical and oxoammonium states. Interestingly, the MpyP-TBF4 first demonstrates higher ionic conductivity, diffusion coefficient and rate constant compared to MimP-TBF4 because of the weaker interactions between aliphatic pyrrolidinium cations and acetonitrile, enabling it has faster mass/charge transport dynamics. Consequently, the MpyP-TBF4 assembled N-ORECs acquire a 3.2 V high cell voltage, a notable energy density and power density (48.2 Wh kg−1 and 23.9 kW kg−1, respectively), as well as outstanding cycling stability with 88.5% capacitance retention after 10,000 cycles. This study offers a promising design for organic redox electrolytes in high-performance N-ORECs.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"4 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144533681","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 Biosensor Based on Ultrathin 2D CN-rGO@AgNPs for ROS Detection in Leukemia Cells 基于超薄2D电化学生物传感器CN-rGO@AgNPs的白血病细胞ROS检测

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-07-02 DOI: 10.1016/j.electacta.2025.146821

Mingxuan Huang, Huafeng Wang, Shicong Gui, Chujia Xu, Yi Chen, Shaohua Hu, Yubo Li

{"title":"Electrochemical Biosensor Based on Ultrathin 2D CN-rGO@AgNPs for ROS Detection in Leukemia Cells","authors":"Mingxuan Huang, Huafeng Wang, Shicong Gui, Chujia Xu, Yi Chen, Shaohua Hu, Yubo Li","doi":"10.1016/j.electacta.2025.146821","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146821","url":null,"abstract":"Accurate monitoring of ROS levels is essential for oxidative stress (OS) management, but their low concentration and instability pose significant detection challenges. Here, we developed a highly sensitive and selective electrochemical biosensor for real-time, micro-volume ROS detection in leukemia cells.The sensor was fabricated using ultrathin g-C₃N₄-rGO (CN-rGO) nanosheet synthesized through a calcination and hydrothermal approach. These nanosheets were deposited onto a screen-printed carbon electrode (SPE) and further modified with silver nanoparticles (AgNPs) to construct a CN-rGO@AgNPs/SPE biosensor. The porous nanostructure significantly enhanced the catalytic surface area and electron transfer efficiency, achieving high sensitivities towards H₂O₂ and O₂·⁻ detection. Using a window titration platform, the sensor detected ROS in 0.1 mL lysates of leukemia cell lines (U-937, THP-1, and MOLM-13) with concentrations of 7.38 ± 4.81 μM, 11.74 ± 0.985 μM, 19.84 ± 3.73 μM, respectively. Furthermore, the platform allowed precise monitoring of doxorubicin (DOX)-induced OS, providing valuable insights for guiding leukemia chemotherapy. Additionally, Lipopolysaccharide (LPS) stimulation experiments demonstrated the sensor's exceptional real-time performance, enabling dynamic detection of H₂O₂ release kinetics and ROS generation rates at the cellular level.Combining high sensitivity, low detection limits, and micro-volume analysis capabilities, this sensor holds great potential for clinical auxiliary diagnosis and drug efficacy assessment in leukemia research.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"27 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144533684","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}

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