Electroanalysis最新文献

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Multiwalled Carbon Nanotube/Carbon Paste-Modified Graphite Sheet Electrode Using Uric Acid as a Naturally Occurring Redox-Active Molecule for Aptamer-Mediated Signal Transduction 多壁碳纳米管/碳糊改性石墨片电极,使用尿酸作为天然氧化还原活性分子用于适配体介导的信号转导
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70251
Jixin Shang, Zhuoya Liao, Qianxi Zhao, Huizi Zhang, Toru Nohgi, Jun Kameoka
{"title":"Multiwalled Carbon Nanotube/Carbon Paste-Modified Graphite Sheet Electrode Using Uric Acid as a Naturally Occurring Redox-Active Molecule for Aptamer-Mediated Signal Transduction","authors":"Jixin Shang,&nbsp;Zhuoya Liao,&nbsp;Qianxi Zhao,&nbsp;Huizi Zhang,&nbsp;Toru Nohgi,&nbsp;Jun Kameoka","doi":"10.1002/elan.70251","DOIUrl":"https://doi.org/10.1002/elan.70251","url":null,"abstract":"<p>This study examines the use of uric acid (UA), a naturally occurring redox-active molecule, as a reporter for aptamer-mediated electrochemical signal transduction. Five graphite-sheet electrode configurations were compared, with the multiwalled carbon nanotube/carbon paste-modified graphite sheet electrode (MWCNT/CP/GSE) providing the strongest overall UA response. The measured linear UA range was 50–1000 μM, with a blank-derived limit of detection of 0.26 μM and a calculated limit of quantification of 0.87 μM. Standard-redox-probe cyclic voltammetry (CV) and electrochemical impedance spectroscopy, together with a nanotube-free CV-treatment control, provided complementary evidence for changes caused by the modification sequence. Four consecutive UA measurements on the same MWCNT/CP/GSE electrode showed no progressive current loss, while the interdevice relative standard deviation was 9.2% across three independently fabricated electrodes. Using the T5 testosterone-binding aptamer, the UA oxidation current decreased over the tested 100–700 nM testosterone interval. Additional cortisol, estradiol, and progesterone time-course controls showed no comparable progressive attenuation under the tested conditions. At 400 nM testosterone, mean peak-current retention was 78.83%–82.34% across 50, 100, and 200 μM UA backgrounds. These results support UA-mediated signal transduction in a controlled model system and show normalized responses of similar magnitude across the tested UA backgrounds. The present study establishes a proof of concept in buffer; physiological testosterone sensitivity and quantitative performance in sweat remain to be established.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.70251","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New Analytical Possibilities of Ion-Selective Electrodes in Self-Powered Bipolar Electrode Arrangement 离子选择电极在自供电双极排列中的新的分析可能性
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70245
Ewa Jaworska, Agata Michalska, Roberto Paolesse, Krzysztof Maksymiuk
{"title":"New Analytical Possibilities of Ion-Selective Electrodes in Self-Powered Bipolar Electrode Arrangement","authors":"Ewa Jaworska,&nbsp;Agata Michalska,&nbsp;Roberto Paolesse,&nbsp;Krzysztof Maksymiuk","doi":"10.1002/elan.70245","DOIUrl":"https://doi.org/10.1002/elan.70245","url":null,"abstract":"<p>All-solid-state potentiometric ion-selective electrodes (ISEs) with plastic membranes are attractive analytical tools; however, their analytical parameters cannot be easily tuned by instrumental control. On the other hand, implementation of ISEs into bipolar electrode systems, working in self-powered mode, opens new attractive analytical possibilities which are proposed and described in the present work. One of the tested options are bipolar electrode systems composed of connected cation- and anion-selective electrodes. This setup results in a linear dependence of the current flowing across the bipolar system on the logarithm of electrolyte concentration. The signal magnitude, the slope of the calibration plot, and the detection limit can be modified by the change of the membrane thickness or its composition. An important advantage of this approach is that the reference electrode is not required. Additionally, by appropriately tailoring the composition of the bipolar electrode system, an analytically beneficial linear dependence of the current directly on ion concentration in a selected range can be achieved, including the physiological range of potassium ionsare concentration. In another application mode, as shown experimentally and confirmed by model calculations, bypassing a potentiometric sensor by another ISE can be effectively used for detection limit lowering of the sensor.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356118","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}
引用次数: 0
Sustainable Rice Husk-Derived Biochar-Based Composite as Conductive Recognition Interface for Selective Electrochemical Sensing of Dopamine 可持续稻壳衍生生物炭基复合材料作为多巴胺选择性电化学传感的导电识别界面
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70247
Tenghui Hong, Zhongshu Duan, Qiuhua Tang, Zhiping Huang, Mingfang Li, Fei Ding, Guixia Tan, Yangping Wen
{"title":"Sustainable Rice Husk-Derived Biochar-Based Composite as Conductive Recognition Interface for Selective Electrochemical Sensing of Dopamine","authors":"Tenghui Hong,&nbsp;Zhongshu Duan,&nbsp;Qiuhua Tang,&nbsp;Zhiping Huang,&nbsp;Mingfang Li,&nbsp;Fei Ding,&nbsp;Guixia Tan,&nbsp;Yangping Wen","doi":"10.1002/elan.70247","DOIUrl":"https://doi.org/10.1002/elan.70247","url":null,"abstract":"<p>Sensitive and selective determination of dopamine (DA) is important for neurochemical analysis, but electrochemical detection in complex matrices remains limited by interfacial passivation and interference from coexisting electroactive species. Here, rice husk-derived biochar (RHB) was integrated with UiO-66-NH<sub>2</sub> through an in situ solvothermal process to construct a conductive composite interface for DA sensing. The RHB scaffold provides an interconnected carbon network for charge transport and increases the accessible electrode/electrolyte interface, whereas incorporation of the UiO-66-NH<sub>2</sub> precursor modifies the interfacial environment relevant to DA accumulation and electrooxidation. Control experiments using bare GCE, RHB/GCE, UiO-66-NH<sub>2</sub> precursor/GCE, and the composite-modified electrode showed that the composite produced the highest DA current response under identical conditions. Post-electrochemical X-ray diffraction revealed disappearance of the characteristic UiO-66-NH<sub>2</sub> reflections after operation in phosphate-buffered saline (PBS), demonstrating loss of long-range metal–organic framework (MOF) crystallinity. UiO-66-NH<sub>2</sub> is therefore regarded as a structural precursor rather than as the persistent electroactive MOF phase during sensing in PBS. Under optimized conditions, the resulting RHB-based composite/GCE (RHB composite/GCE) exhibited two linear ranges between 0.07–7.0 and 7.0–70.0 μM with a detection limit of 10.24 nM. In diluted human urine, recoveries of 99.4% (relative standard deviation (RSD) = 1.3%, <i>n</i> = 3) and 102.3% (RSD = 1.8%, <i>n</i> = 3) were obtained for DA additions of 1.0 and 5.0 μM, respectively. These results demonstrate that biomass-derived conductive carbon can effectively improve the electrochemical performance of a UiO-66-NH<sub>2</sub>-derived sensing interface and provide a practical route for incorporating agricultural waste-derived carbon into electrochemical sensor design.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356283","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}
引用次数: 0
New Analytical Possibilities of Ion-Selective Electrodes in Self-Powered Bipolar Electrode Arrangement 离子选择电极在自供电双极排列中的新的分析可能性
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70245
Ewa Jaworska, Agata Michalska, Roberto Paolesse, Krzysztof Maksymiuk
{"title":"New Analytical Possibilities of Ion-Selective Electrodes in Self-Powered Bipolar Electrode Arrangement","authors":"Ewa Jaworska,&nbsp;Agata Michalska,&nbsp;Roberto Paolesse,&nbsp;Krzysztof Maksymiuk","doi":"10.1002/elan.70245","DOIUrl":"https://doi.org/10.1002/elan.70245","url":null,"abstract":"<p>All-solid-state potentiometric ion-selective electrodes (ISEs) with plastic membranes are attractive analytical tools; however, their analytical parameters cannot be easily tuned by instrumental control. On the other hand, implementation of ISEs into bipolar electrode systems, working in self-powered mode, opens new attractive analytical possibilities which are proposed and described in the present work. One of the tested options are bipolar electrode systems composed of connected cation- and anion-selective electrodes. This setup results in a linear dependence of the current flowing across the bipolar system on the logarithm of electrolyte concentration. The signal magnitude, the slope of the calibration plot, and the detection limit can be modified by the change of the membrane thickness or its composition. An important advantage of this approach is that the reference electrode is not required. Additionally, by appropriately tailoring the composition of the bipolar electrode system, an analytically beneficial linear dependence of the current directly on ion concentration in a selected range can be achieved, including the physiological range of potassium ionsare concentration. In another application mode, as shown experimentally and confirmed by model calculations, bypassing a potentiometric sensor by another ISE can be effectively used for detection limit lowering of the sensor.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356395","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}
引用次数: 0
Fabrication of Biomass Derived Carbon Supported ZnCo Oxide Composite for Enhanced Oxygen Evolution Reaction 生物质衍生碳负载氧化锌复合材料的制备及其增强析氧反应
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70248
Sajjad Hussain, Wajid Hussain, Magdi E. A. Zaki,  Aqsa, Mahboob Ahmad, Muhammad Ali Khan, Naeem Akhtar, Aqsa Hussain, Sobhi M. Gomha, Mohamed A. Nassan
{"title":"Fabrication of Biomass Derived Carbon Supported ZnCo Oxide Composite for Enhanced Oxygen Evolution Reaction","authors":"Sajjad Hussain,&nbsp;Wajid Hussain,&nbsp;Magdi E. A. Zaki,&nbsp; Aqsa,&nbsp;Mahboob Ahmad,&nbsp;Muhammad Ali Khan,&nbsp;Naeem Akhtar,&nbsp;Aqsa Hussain,&nbsp;Sobhi M. Gomha,&nbsp;Mohamed A. Nassan","doi":"10.1002/elan.70248","DOIUrl":"https://doi.org/10.1002/elan.70248","url":null,"abstract":"<p>Metal-Organic Frameworks (MOFs) have emerged as versatile precursors for the synthesis of metal oxides owing to their high surface area and tunable composition. However, their practical application is often limited by poor electrical conductivity, nanoparticle aggregation, and insufficient structural durability. To address these challenges, a biomass-derived carbon-supported Zn–Co oxide composite (ZnCo oxide@C) was developed using jute as a sustainable carbon source, providing a conductive and robust framework. The structural and electrochemical properties of the synthesized materials were systematically investigated using SEM, FTIR, XRD, and electrochemical techniques. The ZnCo oxide@C composite exhibits enhanced electrocatalytic efficacy, delivering a low overpotential of 190.5 mV at a current density of 10 mA cm<sup>−2</sup> and a Tafel slope of 120.28 mV dec<sup>−1</sup>, outperforming pristine ZnCo oxide and carbonized jute. In addition, the composite demonstrates a high mass activity of 241 A g<sup>−1</sup> and excellent durability over 18 h of continuous operation. The improved performance is attributed to the synergistic interaction between ZnCo oxide and the conductive biomass-derived carbon matrix, which facilitates efficient charge transfer, suppresses nanoparticle aggregation, increases the availability of active sites, and improves durability. This study highlights a sustainable approach for the design of high-performance electrocatalysts and provides insights into the development of efficient materials for water-splitting applications.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356396","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}
引用次数: 0
New Analytical Possibilities of Ion-Selective Electrodes in Self-Powered Bipolar Electrode Arrangement 离子选择电极在自供电双极排列中的新的分析可能性
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70245
Ewa Jaworska, Agata Michalska, Roberto Paolesse, Krzysztof Maksymiuk
{"title":"New Analytical Possibilities of Ion-Selective Electrodes in Self-Powered Bipolar Electrode Arrangement","authors":"Ewa Jaworska,&nbsp;Agata Michalska,&nbsp;Roberto Paolesse,&nbsp;Krzysztof Maksymiuk","doi":"10.1002/elan.70245","DOIUrl":"https://doi.org/10.1002/elan.70245","url":null,"abstract":"<p>All-solid-state potentiometric ion-selective electrodes (ISEs) with plastic membranes are attractive analytical tools; however, their analytical parameters cannot be easily tuned by instrumental control. On the other hand, implementation of ISEs into bipolar electrode systems, working in self-powered mode, opens new attractive analytical possibilities which are proposed and described in the present work. One of the tested options are bipolar electrode systems composed of connected cation- and anion-selective electrodes. This setup results in a linear dependence of the current flowing across the bipolar system on the logarithm of electrolyte concentration. The signal magnitude, the slope of the calibration plot, and the detection limit can be modified by the change of the membrane thickness or its composition. An important advantage of this approach is that the reference electrode is not required. Additionally, by appropriately tailoring the composition of the bipolar electrode system, an analytically beneficial linear dependence of the current directly on ion concentration in a selected range can be achieved, including the physiological range of potassium ionsare concentration. In another application mode, as shown experimentally and confirmed by model calculations, bypassing a potentiometric sensor by another ISE can be effectively used for detection limit lowering of the sensor.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356081","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}
引用次数: 0
Fabrication of Biomass Derived Carbon Supported ZnCo Oxide Composite for Enhanced Oxygen Evolution Reaction 生物质衍生碳负载氧化锌复合材料的制备及其增强析氧反应
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70248
Sajjad Hussain, Wajid Hussain, Magdi E. A. Zaki,  Aqsa, Mahboob Ahmad, Muhammad Ali Khan, Naeem Akhtar, Aqsa Hussain, Sobhi M. Gomha, Mohamed A. Nassan
{"title":"Fabrication of Biomass Derived Carbon Supported ZnCo Oxide Composite for Enhanced Oxygen Evolution Reaction","authors":"Sajjad Hussain,&nbsp;Wajid Hussain,&nbsp;Magdi E. A. Zaki,&nbsp; Aqsa,&nbsp;Mahboob Ahmad,&nbsp;Muhammad Ali Khan,&nbsp;Naeem Akhtar,&nbsp;Aqsa Hussain,&nbsp;Sobhi M. Gomha,&nbsp;Mohamed A. Nassan","doi":"10.1002/elan.70248","DOIUrl":"https://doi.org/10.1002/elan.70248","url":null,"abstract":"<p>Metal-Organic Frameworks (MOFs) have emerged as versatile precursors for the synthesis of metal oxides owing to their high surface area and tunable composition. However, their practical application is often limited by poor electrical conductivity, nanoparticle aggregation, and insufficient structural durability. To address these challenges, a biomass-derived carbon-supported Zn–Co oxide composite (ZnCo oxide@C) was developed using jute as a sustainable carbon source, providing a conductive and robust framework. The structural and electrochemical properties of the synthesized materials were systematically investigated using SEM, FTIR, XRD, and electrochemical techniques. The ZnCo oxide@C composite exhibits enhanced electrocatalytic efficacy, delivering a low overpotential of 190.5 mV at a current density of 10 mA cm<sup>−2</sup> and a Tafel slope of 120.28 mV dec<sup>−1</sup>, outperforming pristine ZnCo oxide and carbonized jute. In addition, the composite demonstrates a high mass activity of 241 A g<sup>−1</sup> and excellent durability over 18 h of continuous operation. The improved performance is attributed to the synergistic interaction between ZnCo oxide and the conductive biomass-derived carbon matrix, which facilitates efficient charge transfer, suppresses nanoparticle aggregation, increases the availability of active sites, and improves durability. This study highlights a sustainable approach for the design of high-performance electrocatalysts and provides insights into the development of efficient materials for water-splitting applications.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356080","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}
引用次数: 0
Fabrication of Biomass Derived Carbon Supported ZnCo Oxide Composite for Enhanced Oxygen Evolution Reaction 生物质衍生碳负载氧化锌复合材料的制备及其增强析氧反应
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70248
Sajjad Hussain, Wajid Hussain, Magdi E. A. Zaki,  Aqsa, Mahboob Ahmad, Muhammad Ali Khan, Naeem Akhtar, Aqsa Hussain, Sobhi M. Gomha, Mohamed A. Nassan
{"title":"Fabrication of Biomass Derived Carbon Supported ZnCo Oxide Composite for Enhanced Oxygen Evolution Reaction","authors":"Sajjad Hussain,&nbsp;Wajid Hussain,&nbsp;Magdi E. A. Zaki,&nbsp; Aqsa,&nbsp;Mahboob Ahmad,&nbsp;Muhammad Ali Khan,&nbsp;Naeem Akhtar,&nbsp;Aqsa Hussain,&nbsp;Sobhi M. Gomha,&nbsp;Mohamed A. Nassan","doi":"10.1002/elan.70248","DOIUrl":"https://doi.org/10.1002/elan.70248","url":null,"abstract":"<p>Metal-Organic Frameworks (MOFs) have emerged as versatile precursors for the synthesis of metal oxides owing to their high surface area and tunable composition. However, their practical application is often limited by poor electrical conductivity, nanoparticle aggregation, and insufficient structural durability. To address these challenges, a biomass-derived carbon-supported Zn–Co oxide composite (ZnCo oxide@C) was developed using jute as a sustainable carbon source, providing a conductive and robust framework. The structural and electrochemical properties of the synthesized materials were systematically investigated using SEM, FTIR, XRD, and electrochemical techniques. The ZnCo oxide@C composite exhibits enhanced electrocatalytic efficacy, delivering a low overpotential of 190.5 mV at a current density of 10 mA cm<sup>−2</sup> and a Tafel slope of 120.28 mV dec<sup>−1</sup>, outperforming pristine ZnCo oxide and carbonized jute. In addition, the composite demonstrates a high mass activity of 241 A g<sup>−1</sup> and excellent durability over 18 h of continuous operation. The improved performance is attributed to the synergistic interaction between ZnCo oxide and the conductive biomass-derived carbon matrix, which facilitates efficient charge transfer, suppresses nanoparticle aggregation, increases the availability of active sites, and improves durability. This study highlights a sustainable approach for the design of high-performance electrocatalysts and provides insights into the development of efficient materials for water-splitting applications.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356094","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}
引用次数: 0
Fabrication of Biomass Derived Carbon Supported ZnCo Oxide Composite for Enhanced Oxygen Evolution Reaction 生物质衍生碳负载氧化锌复合材料的制备及其增强析氧反应
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70248
Sajjad Hussain, Wajid Hussain, Magdi E. A. Zaki,  Aqsa, Mahboob Ahmad, Muhammad Ali Khan, Naeem Akhtar, Aqsa Hussain, Sobhi M. Gomha, Mohamed A. Nassan
{"title":"Fabrication of Biomass Derived Carbon Supported ZnCo Oxide Composite for Enhanced Oxygen Evolution Reaction","authors":"Sajjad Hussain,&nbsp;Wajid Hussain,&nbsp;Magdi E. A. Zaki,&nbsp; Aqsa,&nbsp;Mahboob Ahmad,&nbsp;Muhammad Ali Khan,&nbsp;Naeem Akhtar,&nbsp;Aqsa Hussain,&nbsp;Sobhi M. Gomha,&nbsp;Mohamed A. Nassan","doi":"10.1002/elan.70248","DOIUrl":"https://doi.org/10.1002/elan.70248","url":null,"abstract":"<p>Metal-Organic Frameworks (MOFs) have emerged as versatile precursors for the synthesis of metal oxides owing to their high surface area and tunable composition. However, their practical application is often limited by poor electrical conductivity, nanoparticle aggregation, and insufficient structural durability. To address these challenges, a biomass-derived carbon-supported Zn–Co oxide composite (ZnCo oxide@C) was developed using jute as a sustainable carbon source, providing a conductive and robust framework. The structural and electrochemical properties of the synthesized materials were systematically investigated using SEM, FTIR, XRD, and electrochemical techniques. The ZnCo oxide@C composite exhibits enhanced electrocatalytic efficacy, delivering a low overpotential of 190.5 mV at a current density of 10 mA cm<sup>−2</sup> and a Tafel slope of 120.28 mV dec<sup>−1</sup>, outperforming pristine ZnCo oxide and carbonized jute. In addition, the composite demonstrates a high mass activity of 241 A g<sup>−1</sup> and excellent durability over 18 h of continuous operation. The improved performance is attributed to the synergistic interaction between ZnCo oxide and the conductive biomass-derived carbon matrix, which facilitates efficient charge transfer, suppresses nanoparticle aggregation, increases the availability of active sites, and improves durability. This study highlights a sustainable approach for the design of high-performance electrocatalysts and provides insights into the development of efficient materials for water-splitting applications.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356204","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}
引用次数: 0
Multiwalled Carbon Nanotube/Carbon Paste-Modified Graphite Sheet Electrode Using Uric Acid as a Naturally Occurring Redox-Active Molecule for Aptamer-Mediated Signal Transduction 多壁碳纳米管/碳糊改性石墨片电极,使用尿酸作为天然氧化还原活性分子用于适配体介导的信号转导
IF 2.6 3区 化学
Electroanalysis Pub Date : 2026-11-05 DOI: 10.1002/elan.70251
Jixin Shang, Zhuoya Liao, Qianxi Zhao, Huizi Zhang, Toru Nohgi, Jun Kameoka
{"title":"Multiwalled Carbon Nanotube/Carbon Paste-Modified Graphite Sheet Electrode Using Uric Acid as a Naturally Occurring Redox-Active Molecule for Aptamer-Mediated Signal Transduction","authors":"Jixin Shang,&nbsp;Zhuoya Liao,&nbsp;Qianxi Zhao,&nbsp;Huizi Zhang,&nbsp;Toru Nohgi,&nbsp;Jun Kameoka","doi":"10.1002/elan.70251","DOIUrl":"https://doi.org/10.1002/elan.70251","url":null,"abstract":"<p>This study examines the use of uric acid (UA), a naturally occurring redox-active molecule, as a reporter for aptamer-mediated electrochemical signal transduction. Five graphite-sheet electrode configurations were compared, with the multiwalled carbon nanotube/carbon paste-modified graphite sheet electrode (MWCNT/CP/GSE) providing the strongest overall UA response. The measured linear UA range was 50–1000 μM, with a blank-derived limit of detection of 0.26 μM and a calculated limit of quantification of 0.87 μM. Standard-redox-probe cyclic voltammetry (CV) and electrochemical impedance spectroscopy, together with a nanotube-free CV-treatment control, provided complementary evidence for changes caused by the modification sequence. Four consecutive UA measurements on the same MWCNT/CP/GSE electrode showed no progressive current loss, while the interdevice relative standard deviation was 9.2% across three independently fabricated electrodes. Using the T5 testosterone-binding aptamer, the UA oxidation current decreased over the tested 100–700 nM testosterone interval. Additional cortisol, estradiol, and progesterone time-course controls showed no comparable progressive attenuation under the tested conditions. At 400 nM testosterone, mean peak-current retention was 78.83%–82.34% across 50, 100, and 200 μM UA backgrounds. These results support UA-mediated signal transduction in a controlled model system and show normalized responses of similar magnitude across the tested UA backgrounds. The present study establishes a proof of concept in buffer; physiological testosterone sensitivity and quantitative performance in sweat remain to be established.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"38 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.70251","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149356206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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