Pub Date : 2024-10-18DOI: 10.1016/j.jelechem.2024.118726
Huiling Huang , Tianyu Chen , Xinyu Qin , Bo Quan , Sun Ha Paek , Wang Zhang , Yuanzhe Piao
In this study, a new strategy was presented to enhance glucose sensor performance by modifying a glassy carbon electrode (GCE) with Ag@Au alloy nanoparticles. The synthesis process was designed with a simple replacement reaction to grow the gold layer onto the silver nanparticles to form a core–shell nanostructure. The resulting nanocomposite modified electrode exhibited superior electrocatalytic activity and stability in glucose sensing. Electrochemical measurements were undertaken to assess the performance of the as-synthesized Ag@Au/GCE. The Ag@Au core–shell nanoparticles modified GCE exhibited outstanding catalytic activity towards glucose detection, resulting in a high current response and a robust linear relationship between concentrations (10 μM–10 mM); the detection limit was remarkably low, at 0.04 μM. This sensor demonstrated a wide linear range, low detection limit, and high levels of selectivity and stability, rendering it suitable for accurate glucose quantification in biological samples.
{"title":"Ag@Au core–shell nanoparticles modified glassy carbon electrode synthesized by simple displacement reaction for non-enzymatic electrochemical glucose sensing","authors":"Huiling Huang , Tianyu Chen , Xinyu Qin , Bo Quan , Sun Ha Paek , Wang Zhang , Yuanzhe Piao","doi":"10.1016/j.jelechem.2024.118726","DOIUrl":"10.1016/j.jelechem.2024.118726","url":null,"abstract":"<div><div>In this study, a new strategy was presented to enhance glucose sensor performance by modifying a glassy carbon electrode (GCE) with Ag@Au alloy nanoparticles. The synthesis process was designed with a simple replacement reaction to grow the gold layer onto the silver nanparticles to form a core–shell nanostructure. The resulting nanocomposite modified electrode exhibited superior electrocatalytic activity and stability in glucose sensing. Electrochemical measurements were undertaken to assess the performance of the as-synthesized Ag@Au/GCE. The Ag@Au core–shell nanoparticles modified GCE exhibited outstanding catalytic activity towards glucose detection, resulting in a high current response and a robust linear relationship between concentrations (10 μM–10 mM); the detection limit was remarkably low, at 0.04 μM. This sensor demonstrated a wide linear range, low detection limit, and high levels of selectivity and stability, rendering it suitable for accurate glucose quantification in biological samples.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118726"},"PeriodicalIF":4.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-18DOI: 10.1016/j.jelechem.2024.118727
Gloria Zlatić , Ivana Martinović , Zora Pilić , Janez Kovač , Stipe Čelan
Microbiologically influenced corrosion (MIC1) of Al 5083 caused by P. aeruginosa was inhibited by A. annua aqueous extract (AAE2). Electrochemical measurements revealed that the adsorption of AAE on the electrode surface protected Al 5083 from MIC in a simulated marine environment with inhibition efficiency of 78 %. The adsorption layer was formed due to ionized chlorogenic acid interacting with charged Al 5083 surface, preventing bacterial adhesion and growth. Adding AAE promoted the formation of a protective Al2O3, and decreased the surface layer porosity. The pitting corrosion reduced considerably when AAE was added to biotic seawater, supporting the ICP-OES results.
A. annua 水提取物（AAE2）抑制了铜绿微囊藻对 Al 5083 的微生物腐蚀（MIC1）。电化学测量结果表明，在模拟海洋环境中，AAE 在电极表面的吸附保护了 Al 5083 免受 MIC 的腐蚀，其抑制效率为 78%。吸附层的形成是由于电离的绿原酸与带电的 Al 5083 表面相互作用，阻止了细菌的粘附和生长。添加 AAE 可促进保护性 Al2O3 的形成，并降低表面层的孔隙率。在生物海水中添加 AAE 后，点蚀现象大大减少，这与 ICP-OES 的结果相吻合。
{"title":"Inhibition of microbiologically influenced corrosion of Al alloy 5083 in the presence of Pseudomonas aeruginosa by Artemisia annua L","authors":"Gloria Zlatić , Ivana Martinović , Zora Pilić , Janez Kovač , Stipe Čelan","doi":"10.1016/j.jelechem.2024.118727","DOIUrl":"10.1016/j.jelechem.2024.118727","url":null,"abstract":"<div><div>Microbiologically influenced corrosion (MIC<span><span><sup>1</sup></span></span>) of Al 5083 caused by <em>P. aeruginosa</em> was inhibited by <em>A. annua</em> aqueous extract (AAE<span><span><sup>2</sup></span></span>). Electrochemical measurements revealed that the adsorption of AAE on the electrode surface protected Al 5083 from MIC in a simulated marine environment with inhibition efficiency of 78 %. The adsorption layer was formed due to ionized chlorogenic acid interacting with charged Al 5083 surface, preventing bacterial adhesion and growth. Adding AAE promoted the formation of a protective Al<sub>2</sub>O<sub>3</sub>, and decreased the surface layer porosity. The pitting corrosion reduced considerably when AAE was added to biotic seawater, supporting the ICP-OES results.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118727"},"PeriodicalIF":4.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-17DOI: 10.1016/j.jelechem.2024.118712
Md Shahjahan Kabir Chowdury , YeJi Park , Sung Bum Park , Yong-il Park
Complying with durability regulations is crucial for the successful commercialization of proton exchange membrane fuel cells (PEMFCs). This study evaluates the literature on complex and multi-faceted degradation processes, durability, lifetime concerns, recent advancements, and mitigation measures for proton exchange membranes (PEMs) and membrane electrode assemblies (MEAs). Extensive research has explored the degradation mechanisms of low-temperature perfluorinated ionomers, such as Nafion®, alongside non-fluorinated PEMs, including hydrocarbon-based polymers and organic–inorganic nanocomposites. Additionally, high-temperature PEMs based on phosphoric acid-doped polybenzimidazole (PA-PBI) have also been reported. In MEAs, the Pt/C electrocatalyst, catalyst layer (CL), and gas diffusion layer (GDL) play crucial roles, with degradation occurring through Pt nanoparticles dissolution, electrochemical Ostwald ripening, Pt particles growth/precipitation on the membrane, carbon support corrosion, mass transfer difficulties for ionomer redistribution and reduced porosity, and membrane deterioration. For long-term durability in fuel cell operation, various influential factors are investigated such as accelerated stress tests (ASTs) for open-circuit voltage, dynamic load, humidity cycling, high temperature, freeze–thaw effects, Pt degradation, GDL, startup-shutdown state, different fuels, along with measurements of membrane properties and cell performance. Accelerated stress test protocols for transportation accurately depict long-term failure modes, targeting specific degradation paths or combinations of mechanisms. Mitigation strategies for these issues are also suggested. In addition, this study aims to contribute to advancing durability enhancement and mitigation strategies through a comprehensive analysis of novel material systems optimized for the development of next-generation low-temperature and high-temperature PEMs.
{"title":"Degradation mechanisms, long-term durability challenges, and mitigation methods for proton exchange membranes and membrane electrode assemblies with Pt/C electrocatalysts in low-temperature and high-temperature fuel cells: A comprehensive review","authors":"Md Shahjahan Kabir Chowdury , YeJi Park , Sung Bum Park , Yong-il Park","doi":"10.1016/j.jelechem.2024.118712","DOIUrl":"10.1016/j.jelechem.2024.118712","url":null,"abstract":"<div><div>Complying with durability regulations is crucial for the successful commercialization of proton exchange membrane fuel cells (PEMFCs). This study evaluates the literature on complex and multi-faceted degradation processes, durability, lifetime concerns, recent advancements, and mitigation measures for proton exchange membranes (PEMs) and membrane electrode assemblies (MEAs). Extensive research has explored the degradation mechanisms of low-temperature perfluorinated ionomers, such as Nafion®, alongside non-fluorinated PEMs, including hydrocarbon-based polymers and organic–inorganic nanocomposites. Additionally, high-temperature PEMs based on phosphoric acid-doped polybenzimidazole (PA-PBI) have also been reported. In MEAs, the Pt/C electrocatalyst, catalyst layer (CL), and gas diffusion layer (GDL) play crucial roles, with degradation occurring through Pt nanoparticles dissolution, electrochemical Ostwald ripening, Pt particles growth/precipitation on the membrane, carbon support corrosion, mass transfer difficulties for ionomer redistribution and reduced porosity, and membrane deterioration. For long-term durability in fuel cell operation, various influential factors are investigated such as accelerated stress tests (ASTs) for open-circuit voltage, dynamic load, humidity cycling, high temperature, freeze–thaw effects, Pt degradation, GDL, startup-shutdown state, different fuels, along with measurements of membrane properties and cell performance. Accelerated stress test protocols for transportation accurately depict long-term failure modes, targeting specific degradation paths or combinations of mechanisms. Mitigation strategies for these issues are also suggested. In addition, this study aims to contribute to advancing durability enhancement and mitigation strategies through a comprehensive analysis of novel material systems optimized for the development of next-generation low-temperature and high-temperature PEMs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118712"},"PeriodicalIF":4.1,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529091","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}
Understanding the electrochemical of paseodymium ions in molten salt is essential to improve electrolytic efficiency. To elucidate the electroreduction mechanism of praseodymium ions and overcome the limitations associated with regulating the yield of praseodymium metal in the industrial praseodymium electrolysis process, the electrochemical behaviour of praseodymium on the W working electrode surface in the LiF-PrF3-Pr6O11 molten salt system was determined by square–wave voltammetry, chronoamperometry, cyclic voltammetry and potentiometry analyses. The results indicated that the reduction of Pr3+ on the W cathode is a one-step quasireversible Pr3+/Pr reduction process controlled by diffusion of the LiF-PrF3 and (LiF-PrF3)eut-Pr6O11 electrolytes at 1223 K Pr3+ in the LiF-PrF3-Pr6O11 molten salt has a diffusion coefficient of DPr3+/Pr = 0.20 × 10−8–4.11 × 10−8 cm2·s−1. The incorporation of Pr6O11 increased the electrochemical activity of Pr3+ in the LiF-PrF3 system. Pr crystallization on the W electrode was achieved by three-dimensional progressive nucleation.
{"title":"Investigation of the electrochemical behaviour of praseodymium ions in a LiF-PrF3-Pr6O11 molten salt system","authors":"Shumei Chen, Peng Xukun, Mingyang Tan, Qiang Li, Chunfa Liao, Xu Wang, Xinyu Wu","doi":"10.1016/j.jelechem.2024.118724","DOIUrl":"10.1016/j.jelechem.2024.118724","url":null,"abstract":"<div><div>Understanding the electrochemical of paseodymium ions in molten salt is essential to improve electrolytic efficiency. To elucidate the electroreduction mechanism of praseodymium ions and overcome the limitations associated with regulating the yield of praseodymium metal in the industrial praseodymium electrolysis process, the electrochemical behaviour of praseodymium on the W working electrode surface in the LiF-PrF<sub>3</sub>-Pr<sub>6</sub>O<sub>11</sub> molten salt system was determined by square–wave voltammetry, chronoamperometry, cyclic voltammetry and potentiometry analyses. The results indicated that the reduction of Pr<sup>3+</sup> on the W cathode is a one-step quasireversible Pr<sup>3+</sup>/Pr reduction process controlled by diffusion of the LiF-PrF<sub>3</sub> and (LiF-PrF<sub>3</sub>)<sub>eut</sub>-Pr<sub>6</sub>O<sub>11</sub> electrolytes at 1223 K Pr<sup>3+</sup> in the LiF-PrF<sub>3</sub>-Pr<sub>6</sub>O<sub>11</sub> molten salt has a diffusion coefficient of <em>D<sub>Pr3+/Pr</sub></em> = 0.20 × 10<sup>−8</sup>–4.11 × 10<sup>−8</sup> cm<sup>2</sup>·s<sup>−1</sup>. The incorporation of Pr<sub>6</sub>O<sub>11</sub> increased the electrochemical activity of Pr<sup>3+</sup> in the LiF-PrF<sub>3</sub> system. Pr crystallization on the W electrode was achieved by three-dimensional progressive nucleation.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118724"},"PeriodicalIF":4.1,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-16DOI: 10.1016/j.jelechem.2024.118722
Qiya Gao , Zetao Chen , Yongchang Bai , Jie Fu , Ziyue Qin , Shuang Li
With the rapid development of integrated electronic circuit technology, biological fluid-electricity integrated detection systems have gradually become a research hotspot. Researchers have integrated biological fluid electrical detection methods into circuits and developed small, low-power, portable detection devices equipped with sensing electrodes, which can achieve continuous monitoring of human health parameters. In recent years, the integration of reverse iontophoresis technology that can be used to extract body fluids with electrochemical sensors has opened up the possibility of flexible, portable biochemical sensing with excellent detection sensitivity. Herein, we present a method for extracting biofluids based on reverse iontophoresis technology, coupled with electrochemical sensing techniques for the simultaneous detection of various biomarkers in body fluids. The multi-channel sensing electrode was modified layer by layer using nitrogen-doped graphene (N-Gr), ion-selective membrane, or lactate oxidase for rapid and sensitive detection of pH (3–8), ammonium ion (NH4+) (0.1 mM–50 mM), and lactic acid (1 mM–50 mM). Subsequently, an integrated system for electrical stimulation extraction and sensing analysis based on reverse iontophoresis was established and experimentally tested. Experimental results demonstrated that the multi-channel joint detection sensing electrode has excellent sensing linearity, specificity, repeatability, and long-term stability. Finally, a smartphone-based WeChat applet was developed, which can realize parameter setting, function selection, and result display of sensor detection. In this study, reverse iontophoresis technology was used to collect body fluids, and the important biomarkers pH, NH4+, and lactic acid in the body fluids were detected. Overall, this research presents an integrated detection system and a multi-channel sensing scheme for the detection of important biochemical markers in bodily fluids, thereby providing potential value for health monitoring applications.
{"title":"Reverse iontophoresis sensing electrode for joint detection of pH, NH4+, and lactic acid","authors":"Qiya Gao , Zetao Chen , Yongchang Bai , Jie Fu , Ziyue Qin , Shuang Li","doi":"10.1016/j.jelechem.2024.118722","DOIUrl":"10.1016/j.jelechem.2024.118722","url":null,"abstract":"<div><div>With the rapid development of integrated electronic circuit technology, biological fluid-electricity integrated detection systems have gradually become a research hotspot. Researchers have integrated biological fluid electrical detection methods into circuits and developed small, low-power, portable detection devices equipped with sensing electrodes, which can achieve continuous monitoring of human health parameters. In recent years, the integration of reverse iontophoresis technology that can be used to extract body fluids with electrochemical sensors has opened up the possibility of flexible, portable biochemical sensing with excellent detection sensitivity. Herein, we present a method for extracting biofluids based on reverse iontophoresis technology, coupled with electrochemical sensing techniques for the simultaneous detection of various biomarkers in body fluids. The multi-channel sensing electrode was modified layer by layer using nitrogen-doped graphene (<em>N</em>-Gr), ion-selective membrane, or lactate oxidase for rapid and sensitive detection of pH (3–8), ammonium ion (NH<sub>4</sub><sup>+</sup>) (0.1 mM–50 mM), and lactic acid (1 mM–50 mM). Subsequently, an integrated system for electrical stimulation extraction and sensing analysis based on reverse iontophoresis was established and experimentally tested. Experimental results demonstrated that the multi-channel joint detection sensing electrode has excellent sensing linearity, specificity, repeatability, and long-term stability. Finally, a smartphone-based WeChat applet was developed, which can realize parameter setting, function selection, and result display of sensor detection. In this study, reverse iontophoresis technology was used to collect body fluids, and the important biomarkers pH, NH<sub>4</sub><sup>+</sup>, and lactic acid in the body fluids were detected. Overall, this research presents an integrated detection system and a multi-channel sensing scheme for the detection of important biochemical markers in bodily fluids, thereby providing potential value for health monitoring applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118722"},"PeriodicalIF":4.1,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-16DOI: 10.1016/j.jelechem.2024.118721
Xinru Qu , Gaoyuan Liu , Na Xu , Lina Zhao , Zhanlin Xu
Flexible zinc-air batteries have garnered significant attention due to their high energy density, low cost, and environmental friendliness. However, issues such as poor cycle life and anode dendrite growth severely hinder their practical application. This study introduces polyethylene glycol (PEG) as a pore-forming agent and incorporates nano SiO2 into a polyacrylamide/carboxymethyl cellulose (PAM/CMC) composite hydrogel, resulting in a PAM/CMC/PEG/SiO2 (PCPS) composite hydrogel. Phase analysis and electrochemical characterization of PCPS were conducted. The hydrogel electrolyte formed in an alkaline KI environment, when assembled into a battery, achieved a capacity of 494.6 mAh/g and maintained a low potential range of 0.36 V for over 40 h, with an energy efficiency of 86.3 % for the first 60 cycles. To address the issue of dendrite growth in alkaline environments, this study also explores the performance of PCPS composite hydrogel in near-neutral environments.
柔性锌空气电池因其能量密度高、成本低和环保而备受关注。然而，循环寿命短和阳极枝晶生长等问题严重阻碍了其实际应用。本研究引入聚乙二醇（PEG）作为成孔剂，并将纳米二氧化硅加入聚丙烯酰胺/羧甲基纤维素（PAM/CMC）复合水凝胶中，从而得到 PAM/CMC/PEG/SiO2 (PCPS) 复合水凝胶。对 PCPS 进行了相分析和电化学表征。在碱性 KI 环境中形成的水凝胶电解质组装成电池后，容量达到 494.6 mAh/g，并在 0.36 V 的低电位范围内维持了 40 多小时，前 60 个循环的能量效率为 86.3%。为了解决树枝状突起在碱性环境中生长的问题，本研究还探讨了 PCPS 复合水凝胶在近中性环境中的性能。
{"title":"Study on the enhancement of flexible zinc-air battery performance with polyethylene glycol and nano SiO2 composite hydrogel","authors":"Xinru Qu , Gaoyuan Liu , Na Xu , Lina Zhao , Zhanlin Xu","doi":"10.1016/j.jelechem.2024.118721","DOIUrl":"10.1016/j.jelechem.2024.118721","url":null,"abstract":"<div><div>Flexible zinc-air batteries have garnered significant attention due to their high energy density, low cost, and environmental friendliness. However, issues such as poor cycle life and anode dendrite growth severely hinder their practical application. This study introduces polyethylene glycol (PEG) as a pore-forming agent and incorporates nano SiO<sub>2</sub> into a polyacrylamide/carboxymethyl cellulose (PAM/CMC) composite hydrogel, resulting in a PAM/CMC/PEG/SiO<sub>2</sub> (PCPS) composite hydrogel. Phase analysis and electrochemical characterization of PCPS were conducted. The hydrogel electrolyte formed in an alkaline KI environment, when assembled into a battery, achieved a capacity of 494.6 mAh/g and maintained a low potential range of 0.36 V for over 40 h, with an energy efficiency of 86.3 % for the first 60 cycles. To address the issue of dendrite growth in alkaline environments, this study also explores the performance of PCPS composite hydrogel in near-neutral environments.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118721"},"PeriodicalIF":4.1,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-15DOI: 10.1016/j.jelechem.2024.118723
Yuda Prima Hardianto , Naseemah A. Noorwali , Syed Shaheen Shah , Mostafa M. Mohamed , Syed Ali Abbas , Muhammad Ashraf , Md. Abdul Aziz
Platinum-based electrodes continue to be extensively studied, with a key focus on decreasing their cost. This research addresses this challenge by depositing platinum (Pt) nanoparticles onto a cost-effective stainless steel mesh (SSM) substrate for the hydrogen evolution reaction (HER). Pt nanoparticles were deposited on SSM (Pt/SSM) using a simple chemical thermal reduction method. The effects of varying the concentration of the K2PtCl4 precursor on Pt deposition and catalytic performance were investigated. Results showed that higher precursor concentrations led to increased Pt loading and improved HER activity, although the loading remained lower than that of commercial electrodes (0.011 mg/cm2). The optimized Pt/SSM, prepared with a 2 mM K2PtCl4 solution, achieved a low overpotential of 101 mV and a Tafel slope of 53 mV/decade in 0.5 M H2SO4, with excellent stability. These findings highlight the potential of Pt/SSM electrocatalysts for efficient hydrogen production and emphasize the importance of electrolyte conditions in optimizing performance.
{"title":"Platinum/Stainless-Steel mesh electrode fabrication via Chemically thermal reduction for efficient hydrogen evolution reaction","authors":"Yuda Prima Hardianto , Naseemah A. Noorwali , Syed Shaheen Shah , Mostafa M. Mohamed , Syed Ali Abbas , Muhammad Ashraf , Md. Abdul Aziz","doi":"10.1016/j.jelechem.2024.118723","DOIUrl":"10.1016/j.jelechem.2024.118723","url":null,"abstract":"<div><div>Platinum-based electrodes continue to be extensively studied, with a key focus on decreasing their cost. This research addresses this challenge by depositing platinum (Pt) nanoparticles onto a cost-effective stainless steel mesh (SSM) substrate for the hydrogen evolution reaction (HER). Pt nanoparticles were deposited on SSM (Pt/SSM) using a simple chemical thermal reduction method. The effects of varying the concentration of the K<sub>2</sub>PtCl<sub>4</sub> precursor on Pt deposition and catalytic performance were investigated. Results showed that higher precursor concentrations led to increased Pt loading and improved HER activity, although the loading remained lower than that of commercial electrodes (0.011 mg/cm<sup>2</sup>). The optimized Pt/SSM, prepared with a 2 mM K<sub>2</sub>PtCl<sub>4</sub> solution, achieved a low overpotential of 101 mV and a Tafel slope of 53 mV/decade in 0.5 M H<sub>2</sub>SO<sub>4</sub>, with excellent stability. These findings highlight the potential of Pt/SSM electrocatalysts for efficient hydrogen production and emphasize the importance of electrolyte conditions in optimizing performance.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118723"},"PeriodicalIF":4.1,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-13DOI: 10.1016/j.jelechem.2024.118717
Jialing Ma , Huanqiao Song , Zhihong He , Yu Chen , Mingsheng Luo
The N-doped carbon modified MnO composites were successfully prepared using K2MnO4 as the manganese source, CH4N2O as the nitrogen source, and glucose, sucrose, or reduced graphene oxide as the carbon sources. Among them, the composite (MPN) prepared using glucose as the carbon source exhibited excellent electrochemical performance, attributed to its relatively small particle size (6.4 nm), high specific surface area of 199.4 m2·g−1, and a high ID/IG ratio of 0.86. The MnO in MPN contained a significant amount of Mn3+, ∼16.8 %, which is ascribed to the incomplete reduction of high valence Mn during the process of synthesis. With the formation of Mn3+, a large number of cationic vacancies were generated, which increased the diffusion coefficient of Li+ from 2.12 × 10−14 cm2 s −1 to 5.94 × 10−13 cm2 s−1. The carbon layer with appropriate thickness, doped N and mesoporous structure suitable for electrolyte transport provide a fast ion/electron transport channels for MnO, and ensure a stable interface structure in the electrochemical reactions. Consequently, the MPN anode material exhibited remarkable high current discharge capacity (769.5 mAh·g−1 at a high current density of 2 A·g−1) and excellent cycling performance (882.2 mAh·g−1 after 200 cycles at 1 A·g−1), indicating its exceptional rate performance and cycle stability. Furthermore, the lithium ion capacitor constructed with MPN as anode and activated carbon as cathode demonstrated a high specific energy of 190 Wh·kg−1, a high specific power of 205.3 W·kg−1, and an impressive cycling lifespan of up to 3000 cycles without obvious degradation.
{"title":"Selection of high rate capability and cycling stability MnO anode material for lithium-ion capacitors: Effect of the carbon source","authors":"Jialing Ma , Huanqiao Song , Zhihong He , Yu Chen , Mingsheng Luo","doi":"10.1016/j.jelechem.2024.118717","DOIUrl":"10.1016/j.jelechem.2024.118717","url":null,"abstract":"<div><div>The <em>N</em>-doped carbon modified MnO composites were successfully prepared using K<sub>2</sub>MnO<sub>4</sub> as the manganese source, CH<sub>4</sub>N<sub>2</sub>O as the nitrogen source, and glucose, sucrose, or reduced graphene oxide as the carbon sources. Among them, the composite (MPN) prepared using glucose as the carbon source exhibited excellent electrochemical performance, attributed to its relatively small particle size (6.4 nm), high specific surface area of 199.4 m<sup>2</sup>·g<sup>−1</sup>, and a high I<sub>D</sub>/I<sub>G</sub> ratio of 0.86. The MnO in MPN contained a significant amount of Mn<sup>3+</sup>, ∼16.8 %, which is ascribed to the incomplete reduction of high valence Mn during the process of synthesis. With the formation of Mn<sup>3+</sup>, a large number of cationic vacancies were generated, which increased the diffusion coefficient of Li<sup>+</sup> from 2.12 × 10<sup>−14</sup> cm<sup>2</sup> s <sup>−1</sup> to 5.94 × 10<sup>−13</sup> cm<sup>2</sup> s<sup>−1</sup>. The carbon layer with appropriate thickness, doped N and mesoporous structure suitable for electrolyte transport provide a fast ion/electron transport channels for MnO, and ensure a stable interface structure in the electrochemical reactions. Consequently, the MPN anode material exhibited remarkable high current discharge capacity (769.5 mAh·g<sup>−1</sup> at a high current density of 2 A·g<sup>−1</sup>) and excellent cycling performance (882.2 mAh·g<sup>−1</sup> after 200 cycles at 1 A·g<sup>−1</sup>), indicating its exceptional rate performance and cycle stability. Furthermore, the lithium ion capacitor constructed with MPN as anode and activated carbon as cathode demonstrated a high specific energy of 190 Wh·kg<sup>−1</sup>, a high specific power of 205.3 W·kg<sup>−1</sup>, and an impressive cycling lifespan of up to 3000 cycles without obvious degradation.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118717"},"PeriodicalIF":4.1,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142437735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-13DOI: 10.1016/j.jelechem.2024.118719
Chengjiao Che , Jianqiang Bi , Xihua Zhang , Yao Yang , Hongyi Wang , Jiacheng Rong
High-entropy oxides (HEOs) are attractive options for anode materials in lithium-ion batteries (LIBs) because of their impressive specific capacity and structural stability. The multi-element composition of HEOs endows them with diverse physicochemical properties. However, the role of different elements in the energy storage mechanism remains unclear, and the limited number of successfully synthesized high-entropy oxide systems currently hinders further development. Therefore, developing HEOs with different compositions and studying their electrochemical properties is of great significance. Using the glycine-nitrate solution combustion synthesis (SCS) method, we produced two new High Entropy Oxides (HEOs), namely (FeCoMgCr)3O4 and (FeCoMgCrLi)3O4, and assessed their electrochemical performance as LIBs anode materials. The studies indicate that the inclusion of lithium significantly enhances the lithium storing capabilities of the material system. Specifically, after undergoing two hundred cycles at a current density of 200 mA/g, (FeCoMgCrLi)3O4 exhibited a specific capacity of 658 mAh/g, which was considerably greater than the specific capacity of (FeCoMgCr)3O4, which was 306.9 mAh/g. This work enriches the spinel-type high-entropy oxide systems and proposes a new design strategy for HEOs as LIBs anode materials.
{"title":"Synthesis and electrochemical performance of novel high-entropy spinel oxide (FeCoMgCrLi)3O4","authors":"Chengjiao Che , Jianqiang Bi , Xihua Zhang , Yao Yang , Hongyi Wang , Jiacheng Rong","doi":"10.1016/j.jelechem.2024.118719","DOIUrl":"10.1016/j.jelechem.2024.118719","url":null,"abstract":"<div><div>High-entropy oxides (HEOs) are attractive options for anode materials in lithium-ion batteries (LIBs) because of their impressive specific capacity and structural stability. The multi-element composition of HEOs endows them with diverse physicochemical properties. However, the role of different elements in the energy storage mechanism remains unclear, and the limited number of successfully synthesized high-entropy oxide systems currently hinders further development. Therefore, developing HEOs with different compositions and studying their electrochemical properties is of great significance. Using the glycine-nitrate solution combustion synthesis (SCS) method, we produced two new High Entropy Oxides (HEOs), namely (FeCoMgCr)<sub>3</sub>O<sub>4</sub> and (FeCoMgCrLi)<sub>3</sub>O<sub>4</sub>, and assessed their electrochemical performance as LIBs anode materials. The studies indicate that the inclusion of lithium significantly enhances the lithium storing capabilities of the material system. Specifically, after undergoing two hundred cycles at a current density of 200 mA/g, (FeCoMgCrLi)<sub>3</sub>O<sub>4</sub> exhibited a specific capacity of 658 mAh/g, which was considerably greater than the specific capacity of (FeCoMgCr)<sub>3</sub>O<sub>4</sub>, which was 306.9 mAh/g. This work enriches the spinel-type high-entropy oxide systems and proposes a new design strategy for HEOs as LIBs anode materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118719"},"PeriodicalIF":4.1,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-12DOI: 10.1016/j.jelechem.2024.118715
Xiru Cao , Xiao Sun , Weifan Chen , Jiaxing Han , Ao Li , Chen Ji , Juhua Zheng , Vinicius Del Colle , Hamilton Varela , Jiujun Zhang , Changwei Pan , Qingyu Gao
The structure and morphology of oxide on the metal electrodes are strongly linked with the activity and stability of the electrocatalysts. Herein, the novel co-effect of anion and hydrated proton on structure of PtO2 formation is observed during the oxidation of water on Pt(100) preferentially oriented nanoparticles with in situ Raman spectroscopy and XPS. Higher concentrations (≥1.5 M) of non-specifically adsorbed perchlorate in 0.1 M perchloric acid solution facilitated the formation of crystalline α−PtO2 during the electro−oxidation of Pt(100), and no crystalline α−PtO2 was obtained without acid. Higher acidity electrolyte solution favors the formation of crystalline α–PtO2, indicating that proton plays a key role since specifically adsorbed sulfate without sulfuric acid did not lead to the formation of crystalline α–PtO2. A model containing anions, protons, and water molecules co-adsorbed on the Pt surface is constructed during density functional theory (DFT) calculations, which well explains the formation of crystalline α–PtO2 depending on anion and proton. The study findings provide an alternate approach for environmentally friendly and controllable preparation of Adams’ catalyst and an atomic–level understanding of oxide formation on Pt electrodes, which is essential for developing the next–generation electro-catalyst with exceptional performance and stability.
{"title":"Co-effect of perchlorate anions and hydrated protons on the electrochemical formation of Adams’ catalyst","authors":"Xiru Cao , Xiao Sun , Weifan Chen , Jiaxing Han , Ao Li , Chen Ji , Juhua Zheng , Vinicius Del Colle , Hamilton Varela , Jiujun Zhang , Changwei Pan , Qingyu Gao","doi":"10.1016/j.jelechem.2024.118715","DOIUrl":"10.1016/j.jelechem.2024.118715","url":null,"abstract":"<div><div>The structure and morphology of oxide on the metal electrodes are strongly linked with the activity and stability of the electrocatalysts. Herein, the novel co-effect of anion and hydrated proton on structure of PtO<sub>2</sub> formation is observed during the oxidation of water on Pt(100) preferentially oriented nanoparticles with in situ Raman spectroscopy and XPS. Higher concentrations (≥1.5 M) of non-specifically adsorbed perchlorate in 0.1 M perchloric acid solution facilitated the formation of crystalline α−PtO<sub>2</sub> during the electro−oxidation of Pt(100), and no crystalline α−PtO<sub>2</sub> was obtained without acid. Higher acidity electrolyte solution favors the formation of crystalline α–PtO<sub>2</sub>, indicating that proton plays a key role since specifically adsorbed sulfate without sulfuric acid did not lead to the formation of crystalline α–PtO<sub>2</sub>. A model containing anions, protons, and water molecules co-adsorbed on the Pt surface is constructed during density functional theory (DFT) calculations, which well explains the formation of crystalline α–PtO<sub>2</sub> depending on anion and proton. The study findings provide an alternate approach for environmentally friendly and controllable preparation of Adams’ catalyst and an atomic–level understanding of oxide formation on Pt electrodes, which is essential for developing the next–generation electro-catalyst with exceptional performance and stability.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118715"},"PeriodicalIF":4.1,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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