Journal of Electroanalytical Chemistry最新文献

{"title":"In situ formation of sub nanometer cobalt particle with platinum nanocrystal for high performance oxygen reduction reaction electrocatalyst","authors":"Mohmmad Khalid ,&nbsp;Ana Maria Borges Honorato ,&nbsp;Ximena Zarate ,&nbsp;Shahid Zaman ,&nbsp;Eduardo Schott ,&nbsp;Samaneh Shahgaldi","doi":"10.1016/j.jelechem.2024.118747","DOIUrl":"10.1016/j.jelechem.2024.118747","url":null,"abstract":"<div><div>Hitherto, platinum (Pt) is the most active electrocatalyst for the oxygen reduction reaction (ORR) of the proton exchange membrane fuel cells (PEMFCs). Enhancing the performance and reducing the use of costly Pt is of great significance for the wider adoption of PEMFCs. The present research demonstrates in situ synthesized Pt nanocrystal immobilized with sub nanometer sized cobalt (Co) particles (≤ 0.3 nm) loaded on ketjenblack carbon (KB) support via a simple polyol method as a highly active ORR electrocatalyst. The as synthesized Pt_4.1Co/KB catalyst featured a more positive halfwave potential of 0.925 V with a resultant of 1.8 times higher mass activity than Co free Pt/KB catalyst at 0.9 V in 0.1 M HClO₄ and insignificant decay in ORR performance after 30,000 potential cycles. The excellent electrocatalytic performance of Pt_4.1Co/KB has also been proven in a practical H₂/air fuel cell, demonstrating a maximum peak power density of 1.08 W/cm², comparable to the standard Pt/C-TKK (47 %) catalyst. The improved ORR performance of Pt_4.1Co/KB is attributed to the incorporation of sub nanometer sized Co particles, which synergistically enhance the activity and stability. Computational studies using periodic density functional theory calculations also suggest that the integration of ultrafine Co nanoparticles shifted the Pt contribution to the density of states towards higher energy levels, thereby facilitating the ORR process for the Pt_4.1Co/KB catalyst. This work provides a distinctive development of an efficient and robust ORR catalyst for advancing PEMFCs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118747"},"PeriodicalIF":4.1,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553968","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}

{"title":"Intercalation design of layered vanadium phosphate based cathode material towards high-performance aqueous zinc-ion batteries","authors":"Yan Li ,&nbsp;Wenxin Li ,&nbsp;Hongming Chen ,&nbsp;Zijin Liu ,&nbsp;Xue Li ,&nbsp;Dan Zhou","doi":"10.1016/j.jelechem.2024.118755","DOIUrl":"10.1016/j.jelechem.2024.118755","url":null,"abstract":"<div><div>Aqueous zinc-ion batteries (AZIBs) have attracted significant attention because of high theoretical energy density, low cost, environmental friendliness and high safety. Among various cathode materials, vanadium phosphate (VOPO₄) with a layered structure exhibits huge potential due to high Zn-storage capacity. However, the poor intrinsic conductivity and structural deterioration during the cycling process always result in low Zn²⁺ diffusion coefficient and weak reversibility. Herein, a novel potassium vanadyl phosphate (KVOPO₄) cathode material was designed by the intercalation of K⁺ into the interlayer of VOPO₄ via a simple solvothermal reaction. Benefiting from the unique layered structure and intercalation effect, the KVOPO₄ electrode exhibits large discharge capacity and enhanced cycling stability (153.2 mAh g⁻¹ at 1 A/g after 400 cycles), and excellent rate capability (119.4 mAh g⁻¹ at 5.0 A/g). The electrode also suggests a pseudocapacitance controlled storage behavior with high contribution percentage of 98 % at 0.8 mV/s. Besides, ex-situ XRD and XPS were conducted to demonstrate the related phase transitions upon the Zn²⁺ insertion/extraction process, revealing the reversible Zn-storage mechanism of the KVOPO₄. This work is expected to enrich the design strategy of VOPO₄-based cathode materials and pave the exploration of high-performance AZIBs towards energy storage applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118755"},"PeriodicalIF":4.1,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561141","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}

{"title":"MOF-derived Na3V2(PO4)3-carbon@graphene fibers for flexible fiber-shaped sodium ion battery","authors":"Xiaoxuan Ma ,&nbsp;He Zhang ,&nbsp;Ying Liu ,&nbsp;Wenning Yan ,&nbsp;Chao Chen ,&nbsp;Kun Zhang","doi":"10.1016/j.jelechem.2024.118740","DOIUrl":"10.1016/j.jelechem.2024.118740","url":null,"abstract":"<div><div>With the growing popularity of wearable devices, fiber-shaped rechargeable batteries become increasingly important as the next-generation energy storage devices. However, the practical applications are hindered by the limitation of sluggish kinetics of the Na⁺ transport and poor conductivity. Herein, a novel composite fiber was designed and fabricated as a cathode material for fiber-shaped Na-ion batteries (SIBs). The unique architecture on the fiber surface has three-dimensional porous structure, numerous channels for Na⁺ and electron transport, that facilitates electrolyte infiltration and strain-relaxed substructure. Na₃V₂(PO₄)₃ nanoparticles are uniformly incorporated into carbon matrix. The as-prepared fiber shows improved conductivity, accelerated Na⁺ diffusion kinetics and enhanced mechanical properties. The resulting composite fiber achieves a reversible specific capacity of 57.1mAh g⁻¹ after 1000 cycles with 86.0 % capacity retention and exhibited a superior rate capability via half-cells. Furthermore, the fiber-shaped full SIBs were also fabricated, which present a reversible capacity of 18.2 μAh cm⁻¹ at different bending angles. The full batteries exhibit excellent rate performance, stable cycling capability, and outstanding flexibility. This work may provide new insights into fiber-shaped SIBs for actual wearable applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118740"},"PeriodicalIF":4.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529087","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}

{"title":"Electrodeposition of Cu-based nanoarrays with tailored hierarchical nanostructure and their application for electrochemical nitrate sensing","authors":"Zhengyang Yang ,&nbsp;Cuilei Li ,&nbsp;Dayou Luo ,&nbsp;Jianqiang Wei ,&nbsp;Fanglin Che ,&nbsp;Zhiyong Gu","doi":"10.1016/j.jelechem.2024.118744","DOIUrl":"10.1016/j.jelechem.2024.118744","url":null,"abstract":"<div><div>Excessive nitrate content in the ecosystem has raised environmental concerns as a contaminant in soil and water bodies. Therefore, there is a consistent demand for rapid and continuous detection technologies with simple operational processes. In this work, we present a Cu-based nanoarray fabricated by a template-assisted electrodeposition process. By varying the deposition current density, the nanoarray exhibited a hierarchical nanoneedle structure with a sharp-needle terminal. Structural analysis confirmed that the metallic Cu nanoneedle has a unique crystal structure compared to the control samples of foil or wire structures. The possible deposition mechanism of nanoneedle was discussed based on the initial crystal formation step during electrodeposition. Furthermore, we explored the sensing performance of the Cu nanoarrays through electrochemical nitrate detection by using cyclic voltammetry (CV). The effect of the needle length on sensing performance was evaluated and the 7 μm nanoneedle array showed the highest sensitivity of 1.22 μA μM⁻¹ cm⁻² and a wide detection range of 0.25 mM to 16 mM, about 41-fold enhancement compared to the Cu foil. The square-wave voltammetry (SWV) method was further utilized for the low nitrate content detection (0.02 mM to 0.3 mM) and the nanoneedle array achieved an improved sensitivity of 6.99 μA μM⁻¹ cm⁻² and an LOD of 26 μM. The interference study indicated a good tolerance to various interference species. Multiple cycle scans and long term stability tests were conducted using the nanoneedle electrode, which maintained 80 % sensing response after 25 scan tests and close to 95 % sensing response after 21 testing days. The nanoneedle electrode also demonstrated sensing capability in analyzing nitrate species in a real water sample (tap water). Our work provides a convenient method to obtain a hierarchical metallic nanostructure, and the Cu-based nanoarrays show potential for sensitive detection of nitrate across a wide range of applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118744"},"PeriodicalIF":4.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578414","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}

{"title":"Unravelling The charge storage mechanism in V2O5 nanorods through Systematic structural and electrochemical study","authors":"Misbah Mumtaz ,&nbsp;Asifa Mumtaz","doi":"10.1016/j.jelechem.2024.118745","DOIUrl":"10.1016/j.jelechem.2024.118745","url":null,"abstract":"<div><div>In the present research, we report on vanadium pentoxide (V₂O₅) nanorods, fabricated via a simple sol–gel route, which displayed exceptional performance as electrode material for supercapacitor applications. Rigorous structural and morphological analyses were employed to gain a comprehensive understanding of the key physical parameters involved. Subsequently, standard electroanalytical techniques, including scan rate study (CV), galvanostatic charging/discharging (GCD), and electrochemical impedance spectroscopy (EIS), were used for detailed electrochemical assessment and to investigate the influence of physical parameters on electrochemical attributes. The investigated electrode material displayed a specific capacitance of 365F g⁻¹ at a current density of 1 A g⁻¹ in 2 M NaOH electrolyte. The nominated electrode also exhibited an outstanding energy density of 12.67 Wh kg⁻¹ at an adequate power density of 247.15 W kg⁻¹, with an impressive capacitance retention of 91 % over 5000 cycles. The choice of material, along with the nanostructured design featuring rod-like morphology, played a crucial role in achieving superior performance as a supercapacitor electrode. These insights are vital for investigating structural and morphological changes in V₂O₅-based materials during electrochemical operations.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118745"},"PeriodicalIF":4.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553967","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}

{"title":"Synthesis and performance of cross-linked poly(aryl ether nitrile) anion exchange membranes with dense cations and flexible side-chain structures for water electrolysis","authors":"Jianxiong Hu ,&nbsp;Kexin Chen ,&nbsp;Aman Liu ,&nbsp;Xiaojing Zhang ,&nbsp;Jian Li ,&nbsp;Chenyi Wang ,&nbsp;Xiaoyan Zhao","doi":"10.1016/j.jelechem.2024.118750","DOIUrl":"10.1016/j.jelechem.2024.118750","url":null,"abstract":"<div><div>Anion exchange membranes (AEMs) are the core components in anion exchange membrane water electrolysis (AEMWE), which play crucial role and affect the performance of AEMWE. In this work, a series of cross-linked poly(aryl ether nitrile) anion exchange membranes (CPAEN-dDQA-x) with dense cations and flexible side-chain structures are synthesized. By introducing multiple modification elements into the polymer structure simultaneously, the ion conductivity, dimensional stability, and alkali resistance stability of the prepared AEMs are effectively improved and balanced. The representative CPAEN-dDQA-0.25 showed water absorption of only 27.6 %, swelling rate of 11.2 %, and conductivity of 115.37 mS/cm at 80°C. The IEC and conductivity retention value of CPAEN-dDQA-0.25 after in 2 M NaOH solution at 80°C for 480 h were up to 86.2 % and 82 %, respectively. Meanwhile, the current density of the water electrolysis cell based on CPAEN-dDQA-0.25 is up to 477.0 mA/cm² in 1 M KOH and 2.2 V, and its voltage don’t has significant change after 480 h of operation at a constant current density of 500 mA/cm².</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118750"},"PeriodicalIF":4.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572966","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}

{"title":"How does the solution resistance influence the electrochemical behavior of porous electrodes?","authors":"Andrzej Lasia","doi":"10.1016/j.jelechem.2024.118746","DOIUrl":"10.1016/j.jelechem.2024.118746","url":null,"abstract":"<div><div>In our recent papers simplified models of the porous electrodes in the presence of the electroactive species were presented. In this work, these models are compared with the full model, which considers dc concentration and potential gradients in the pore and the ac effect by division of the pore length into small sections and addition of the solution resistance to the electrode impedance of each section. Simulations for different porosity, concentration, kinetics, and solution resistivity were carried out and allowed to estimate the influence of these factors on the observed complex plane impedance plots. Presence of the dc gradients changes the size of the two semicircles while the ac solution resistance causes formation of the high-frequency straight line at 45° on the complex plane plots. Porosity effects are larger when the total impedance is smaller, that is for higher currents and concentrations of electroactive species and faster kinetics. Estimation of the porosity parameter (Thiele modulus), <span><math><mrow><msub><mi>Φ</mi><mn>0</mn></msub></mrow></math></span>, and the parameter <em>v</em>, which relates concentration and potential in pores, allows for the estimation of the porosity effects on the impedance.</div><div>In the absence of the concentration gradient (i.e.potential gradient only present), a straight line at 45° followed by one skewed semicircle is observed. Conditions for obtaining such impedances are discussed.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118746"},"PeriodicalIF":4.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573133","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}

{"title":"Electrochemically simple, sensitive, and clean method for monitoring norfloxacin in advanced oxidative processes","authors":"Crislânia Carla de Oliveira Morais ,&nbsp;Keurison Figueredo Magalhães ,&nbsp;Elisama Vieira dos Santos ,&nbsp;Suely Souza Leal Castro ,&nbsp;Carlos A. Martínez-Huitle","doi":"10.1016/j.jelechem.2024.118752","DOIUrl":"10.1016/j.jelechem.2024.118752","url":null,"abstract":"<div><div>In this work, an amperometric analysis strategy using a carbon fiber (CF) rod as an anode was developed to follow the degradation process of the norfloxacin (NOR) molecule via electrochemical advanced oxidation processes (EAOP). The voltammetric study showed that drug oxidation is an irreversible process which involves, in the determining stage of the reaction, a proton and an electron in an EC (electron transfer followed by chemical reaction) mechanism. After optimizing the electroanalytical conditions, CF sensor showed a linear amperometric response at concentrations ranging from 1.6 μmol L⁻¹ to 30.0 μmol L⁻¹, with detection and quantification limits of 0.5 μmol L⁻¹ and 1.8 μmol L⁻¹, respectively, which are sufficient to enable in monitoring the drug during its electrolytic degradation. The results clearly showed that the by-products generated during drug degradation do not interfere with the current signal. Other application scenarios were evaluated, such as the determination of NOR in river waters and in the presence of different drug degradation by-products, obtained after EAOPs in chloride-containing medium, and no interference was observed during the electroanalysis. Therefore, the proposed analytical methodology is promising for monitoring and controlling the treatment of water contaminated with NOR antibiotic.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118752"},"PeriodicalIF":4.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572971","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}

{"title":"Mesocrystalline effect boosts the alloying reaction kinetics of Sb2O4 anode in half/full sodium-ion batteries","authors":"Ling Guo ,&nbsp;Liyun Cao ,&nbsp;Jianfeng Huang ,&nbsp;Jiayin Li ,&nbsp;Yong Zhao ,&nbsp;Yijun Liu ,&nbsp;Xing Wang ,&nbsp;Yishou Wang","doi":"10.1016/j.jelechem.2024.118753","DOIUrl":"10.1016/j.jelechem.2024.118753","url":null,"abstract":"<div><div>Mesocrystalline materials are reported to show great advantages in improving electrochemical performance. However, there are no reports about mesocrystalline Sb₂O₄ anode, and the structure advantage in reaction kinetics is unclear. In this work, we have prepared a mesocrystalline Sb₂O₄ structure (M−Sb₂O₄) in a facile hydrothermal process and further explored the structure effect on reaction kinetics. The exploration results show that the micro-flower mesocrystalline M−Sb₂O₄ consists of oriented nanowires with (110) crystal faces showing large surface area and high porosity. This structure can increase the contact area between electrode and electrolyte, provide fast Na⁺ transfer channels, and shorten the charge transport path, exhibiting excellent alloying reaction kinetics. The excellent reaction kinetics improves rate performance with a capacity of 432 mA h g^-1 at 5 A g^-1. Furthermore, it exhibits a high power density of 1700 W kg⁻¹ in the full cell. Compared to the other reported various structured Sb-based anodes, M−Sb₂O₄ exhibits a great performance advantage. This work demonstrates that the mesocrystalline effect can effectively enhance alloying reaction kinetics, providing a new strategy for performance optimization of other alloy-based anodes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118753"},"PeriodicalIF":4.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573467","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}

{"title":"One-step synthesis of dendritic nanostructured single crystal NiSe electrocatalyst for hydrogen evolution reaction","authors":"Qin Li ,&nbsp;Xingqiang Zhou ,&nbsp;Haowei Hu ,&nbsp;Kun Hu ,&nbsp;Hui Liu ,&nbsp;Xiaolong Fang","doi":"10.1016/j.jelechem.2024.118751","DOIUrl":"10.1016/j.jelechem.2024.118751","url":null,"abstract":"<div><div>A novel dendritic nanostructure NiSe has been synthesized for electrocatalytic hydrogen evolution reaction (HER) through a hydrothermal method. The micromorphology and microstructure characterizations show that the branches of the dendritic NiSe are epitaxially grown on the trunk, and individual nickel selenide dendrites have three-dimensional structures with four branches in short axes. The nanostructures of each branch are paralleled to each other in the same plane, and are perpendicular to the trunk with the same crystal orientation. The dendritic NiSe catalyst demonstrates highly efficient HER activity with a low overpotential of 191 mV and a small Tafel slope of 47 mV dec⁻¹ in acidic solutions. The remarkable enhancement of the dendritic NiSe in the HER performance can be attributed to its dense dendritic nano-structure, and high specific surface area, which provide effective diffusion channels and much more catalytic sites towards the HER. This achievement provides a new method for producing cheap and efficient dendritic nanostructures catalysts for water splitting.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118751"},"PeriodicalIF":4.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572967","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}