Journal of Electroanalytical Chemistry最新文献

{"title":"Surface-selenization formed NiFe MOF@NiSex heterogeneous arrays for enhanced oxygen evolution and methanol electrooxidation","authors":"Weiguang Hu ,&nbsp;Qing Yan ,&nbsp;Sainan Ma ,&nbsp;Ruiqin Gao ,&nbsp;Qin Wang ,&nbsp;Weiyong Yuan","doi":"10.1016/j.jelechem.2024.118789","DOIUrl":"10.1016/j.jelechem.2024.118789","url":null,"abstract":"<div><div>Designing reasonable electrocatalysts for oxygen evolution reaction (OER) is a vital issue for water splitting to hydrogen. We report a surface-selenization of NiFe MOF-74 formed NiFe MOF@NiSe_x arrays through the simple solvothermal method. The NiFe MOF@NiSe_x heterostructures greatly enhance the charge transfer and cooperativity of active sites and result in strong adsorption capacity for OH^– to strongly boost the OER and MOR process. The optimized electrode shows the highly efficient catalytic activity for OER with a low onset potential of 1.31 V vs. RHE and small Tafel slopes of 38.3 mV dec⁻¹ in alkaline media. And it shows the extremely low overpotential of 229 and 329 mV at 100 and 500 mA cm⁻². Moreover, its current density can reach more than 500 mA cm⁻² at the potentials of 1.645 V vs. RHE at 0.8 M methanol/1 M KOH electrolyte, and it shows very good long-term stability at large current density. This heterogeneous arrays electrocatalysts may play a positive role in energy conversion and storage process.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118789"},"PeriodicalIF":4.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655334","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":"Charge transfer at electrode surfaces with an insulating film in high-temperature molten salts","authors":"Shun Cao ,&nbsp;Jianbang Ge ,&nbsp;Biwu Cai ,&nbsp;Yang Gao ,&nbsp;Zichen Zhang ,&nbsp;Zhihao Cheng ,&nbsp;Zhijing Yu ,&nbsp;Xin Lu ,&nbsp;Shuqiang Jiao","doi":"10.1016/j.jelechem.2024.118791","DOIUrl":"10.1016/j.jelechem.2024.118791","url":null,"abstract":"<div><div>Molten salt electrochemistry has been widely applied in fields such as electrochemical metallurgy, nuclear material processing, and low carbon techniques. The metal or carbon electrode are generally used as working electrode to reveal the electrochemical reaction mechanism or measure the reaction kinetics. However, these electrodes in high-temperature molten salts may suffer corrosion or oxidation due to the harsh environment, which resulted in errors in electrochemical measurements. In most cases, an insulating film was formed on the electrode surface. Herein we showed the influence of an insulating film on the electrochemical signals based on the experimental tests and numerical simulations. The apparent reaction kinetics gradually became sluggish with the increasing film resistance. The ultra-high film resistance led to the linear potential-current behavior during cyclic voltammetry. Moreover, several typical molten salt electrochemical systems with the existence of an insulating film have also been discussed.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118791"},"PeriodicalIF":4.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655331","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":"In vitro/In vivo oxygen electrochemical nanosensor for bioanalysis","authors":"Alexander N. Vaneev ,&nbsp;Petr V. Gorelkin ,&nbsp;Roman A. Akasov ,&nbsp;Roman V. Timoshenko ,&nbsp;Elena V. Lopatukhina ,&nbsp;Anastasiia S. Garanina ,&nbsp;Tatiana O. Abakumova ,&nbsp;Valery V. Aleksandrin ,&nbsp;Sergey V. Salikhov ,&nbsp;Christopher R.W. Edwards ,&nbsp;Yasufumi Takahashi ,&nbsp;Natalia L. Klyachko ,&nbsp;Yuri E. Korchev ,&nbsp;Alexander S. Erofeev","doi":"10.1016/j.jelechem.2024.118796","DOIUrl":"10.1016/j.jelechem.2024.118796","url":null,"abstract":"<div><div>Direct <em>in vivo</em> monitoring of O₂ is critical in the study of numerous biological processes, and the development of novel highly sensitive techniques for O₂ <em>in vivo</em> detection is of great potential importance. Electrochemical amperometric sensors are some of the most promising, easy to operate, inexpensive, sensitive and have a high temporal resolution. As part of this work, we have demonstrated a direct rapid method for molecular oxygen detection inside multicellular spheroids <em>in vitro</em> and rat brain <em>in vivo</em>. External and internal oxygen profiles in human adenocarcinoma MCF-7 spheroids were studied using developed nanoelectrode. The size of spheroids was shown to affect the level of hypoxia inside them, and also affected the oxygen consumption near spheroids in solution. To demonstrate the <em>in vivo</em> relevance of the novel sensor we used it to measure the oxygen concentrations in the superficial layers of the rat brain. This study demonstrates a minimally invasive electrochemical method for real-time oxygen profiling <em>in vivo</em>.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118796"},"PeriodicalIF":4.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655339","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":"Dynamic hydrogen bubble template electrodeposition of a self-supported Co-P electrocatalyst for efficient alkaline oxygen evolution reaction","authors":"Yunhao Zhang ,&nbsp;Yanxin Qiao ,&nbsp;Yihui Wu","doi":"10.1016/j.jelechem.2024.118793","DOIUrl":"10.1016/j.jelechem.2024.118793","url":null,"abstract":"<div><div>The development of efficient, inexpensive, and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) represents a significant challenge for the large-scale production of hydrogen. The primary obstacle to the advancement of OER is the necessity for a considerably higher overpotential than the theoretical oxygen evolution potential, due to the sluggish kinetics of the electron transfer reaction, which involves a large amount of thermodynamic energy. In this article, amorphous and cauliflower-like Co-P electrocatalysts were in situ grown on nickel foam by dynamic hydrogen bubble template (DHBT) electrodeposition method. The Co-P electrocatalyst with Co/P ratio optimal presented excellent electrocatalytic activities with a low overpotential of 239  mV for OER at 10  mA·cm⁻² and long-term stability in 1.0 M KOH. The outstanding OER performance of the catalyst is mainly attributed the synergistic effect of amorphous and cauliflower-like structure, superhydrophilicity surface, and the electronic regulation by adjusting the atomic ratio of Co to P. This research will bring fresh ideas and strategies for developing novel simple, affordable, and efficient electrocatalysts to boost OER kinetics.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118793"},"PeriodicalIF":4.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655335","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":"Nitrogen-doped carbon coated Na3V2O2(PO4)2F as a cathode for high-performance sodium-ion batteries","authors":"Yuezhen Mao ,&nbsp;J.A. Alonso ,&nbsp;M.T. Fernández-Díaz ,&nbsp;Chunwen Sun","doi":"10.1016/j.jelechem.2024.118763","DOIUrl":"10.1016/j.jelechem.2024.118763","url":null,"abstract":"<div><div>Na₃V₂O₂(PO₄)₂F (NVOPF), a cathode known for the advantages of high voltage, exceptional energy density, and thermal stability, is seen as a promising candidate for sodium-ion battery cathodes. However, the NVOPF exhibits poor performance in sodium storage. Here, we report a NVOPF composite cathode with a nitrogen-doped carbon produced from dopamine hydrochloride at an elevated temperature. Firstly, neutron power diffraction (NPD) is employed to determine the structure of pure NVOPF at different temperatures, including oxygen coordination and the mobility of Na⁺. The nitrogen-doped carbon layer facilitates electron conduction, prevents NVOPF nanoparticle agglomeration, and thus promotes efficient electron and ion transfer during sodium ion insertion/extraction process, thereby improving the stability of the material structure. These results indicate that the N doped carbon@NVOPF cathode material exhibits outstanding electrochemical performance (111mAh/g at 0.1C and 85mAh/g at 1C), while maintaining a capacity retention of 91.06 % after 500 cycles. The enhanced electrochemical performance attributes to efficient charge transfer kinetics offer novel perspectives, and the method can be effectively adapted to other cathode materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118763"},"PeriodicalIF":4.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655332","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":"Dual storage mechanism of Bi2O3/Co3O4/MWCNT composite as an anode for lithium-ion battery and lithium-ion capacitor","authors":"G. Lakshmi Sagar,&nbsp;K. Brijesh,&nbsp;P. Mukesh,&nbsp;Akshay Prakash Hegde,&nbsp;Arvind Kumar,&nbsp;Arjun Kumar,&nbsp;Karthik S. Bhat,&nbsp;H.S. Nagaraja","doi":"10.1016/j.jelechem.2024.118777","DOIUrl":"10.1016/j.jelechem.2024.118777","url":null,"abstract":"<div><div>Bismuth oxide(Bi₂O₃) and cobalt oxide(Co₃O₄) are promising owing to their unique properties, high storage capacity, low cost, and eco-friendliness, making them ideal for lithium-ion batteries(LIBs) and lithium-ion capacitors(LICs) anodes. This study presents the synthesis and thorough characterization of Bi₂O₃/Co₃O₄ and Bi₂O₃/Co₃O₄/MWCNT composites as potential LIB and LIC anode materials. The materials are synthesized using a hydrothermal process succeeded by annealing. Structural, morphological, and compositional studies were analyzed. Various tests evaluated electrochemical performance, including cyclic voltammetry(CV), confirming a dual storage mechanism like alloying and conversion reaction involved for better energy storage. Specific discharge capacities of 834 mAh/g and 1184 mAh/g were recorded for Bi₂O₃/Co₃O₄ and Bi₂O₃/Co₃O₄/MWCNT composite electrodes at a current density of 100 mA/g, respectively. The composite material exhibited notably enhanced rate capability, with 31 % and 51 % discharge capacities for Bi₂O₃/Co₃O₄ and Bi₂O₃/Co₃O₄/MWCNT, respectively. The cyclic stability assessment revealed that Bi₂O₃/Co₃O₄ and Bi₂O₃/Co₃O₄/MWCNT maintained a high coulombic efficiency of around 99 % over 250 charge–discharge cycles at a high current density of 1 A/g. The capacity retention was approximately 253 mAh/g for Bi₂O₃/Co₃O₄ and 439 mAh/g for the Bi₂O₃/Co₃O₄/MWCNT composite, indicating excellent cyclic stability and minimal energy loss during cycling. Moreover, the LICs assembly of Bi₂O₃/Co₃O₄/MWCNT//CB was investigated, revealing a power density of 200 W kg⁻¹ alongside an energy density of 8.64 Wh kg⁻¹. The cyclic stability assessment over 10,000 cycles exhibits a capacity retention of approximately 45 % under a high current density of 2 A/g.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118777"},"PeriodicalIF":4.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655340","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":"Pre-magnetization smashing hydrated vanadium ions to improve redox flow batteries performance","authors":"Shuo Tang ,&nbsp;Jiaqi Wan ,&nbsp;Hong-bo Liu ,&nbsp;Yu Tian ,&nbsp;Jiale Xie ,&nbsp;Xiang Lu","doi":"10.1016/j.jelechem.2024.118776","DOIUrl":"10.1016/j.jelechem.2024.118776","url":null,"abstract":"<div><div>The vanadium redox flow battery (VRFB) has received extensive attention due to its intrinsic safety and high scalability. Currently, there are still deficiencies of low energy efficiency and higher unit capacity cost in VRFB energy storage. Continuously optimizing the battery performance through reducing electrode polarization losses is a necessary way to achieve efficient VRFB energy storage technology. In this study, a method of pre-magnetizing the electrolyte to improve the performance of the battery was proposed. A permanent magnet with an intensity of 0.9 T was used to pre-magnetize the vanadium-ion aqueous electrolyte before feed into the battery stack and working-on, it was found that the diffusion capacity of vanadium ions increased by 133.6 % after pre-magnetized even if the external magnetic field was removed. Meanwhile, both of the charge transfer and concentration polarization resistance of the electrode were reduced. The energy efficiency (EE) of the battery was increased by 6.4 % in the charge–discharge test at current density of 300 mA cm⁻². The power density increased by 6.19 % with current density 400 mA cm⁻² at most, and it prefers to continuously increase as current larger. The electrolyte pre-magnetization showed significant positive improvements on the electrode reaction kinetics and battery charge–discharge cycle.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118776"},"PeriodicalIF":4.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655336","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":"Electrochemical evaluation of the real surface area of copper-zinc alloys","authors":"Oleg I. Zaytsev ,&nbsp;Margarita A. Belokozenko ,&nbsp;Grigorii P. Lakienko ,&nbsp;Eduard E. Levin ,&nbsp;Victoria A. Nikitina ,&nbsp;Sergey Y. Istomin","doi":"10.1016/j.jelechem.2024.118795","DOIUrl":"10.1016/j.jelechem.2024.118795","url":null,"abstract":"<div><div>Accurate measurements of real surface area (RSA) are essential in fundamental electrocatalysis for evaluating the intrinsic activity of various materials. However, existing electrochemical methods for determining RSA values in metallic alloys, particularly those containing active metals, remain underexplored. This study critically assesses the efficacy of capacitance measurement techniques for calculating RSA values in copper-zinc alloys, which are commonly employed as electrocatalysts for CO₂ reduction. We investigate optimal conditions for estimating RSA through cyclic voltammetry, focusing on electrolyte selection and appropriate potential ranges to ensure reliable RSA assessments. Additionally, we emphasize the necessity of using suitable reference samples for accurate specific capacitance calculations. Our findings reveal that potential uncertainties arising from the use of inappropriate reference samples across different Cu-Zn compositions can reach an order of magnitude, rendering them unsuitable for electrocatalytic studies. This research highlights the need for robust surface area quantification techniques to reduce uncertainties in reporting the activities of alloy-based materials in various electrochemical applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118795"},"PeriodicalIF":4.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655333","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":"High sodium conductive polymer electrolyte-based nanoclusters in supercapacitor","authors":"Xinpei Li ,&nbsp;Shanshan Guo ,&nbsp;Guoqin Liu ,&nbsp;Yongtao Wang ,&nbsp;Mingxin Zhang ,&nbsp;Yuan Liu ,&nbsp;Yijie Gu","doi":"10.1016/j.jelechem.2024.118765","DOIUrl":"10.1016/j.jelechem.2024.118765","url":null,"abstract":"<div><div>The sodium-ion polymer electrolytes (PEs) spur the development of the high safe solid batteries due to their merits of safety, flexibility, lower interfacial resistance with electrodes, and easy processing. Herein, a rational strategy is developed to construct the PE, which can integrate the excellent sodium ion conductivity with the mechanical performances. This strategy applies the nano-sized metal oxide clusters (MOCs) not only to supply the sodium ions but also to inhibit the polymer crystallization. The released polymer chains, crosslinked via physical crosslinking points (nanoclusters), form a network that provides the electrolyte film with toughness over a wide temperature range. The targeted electrolyte exhibits excellent Na-ion conductivity of 3.8 × 10⁻⁴ S cm⁻¹ at room temperature, tensile strength up to 0.74 Mpa and breaking elongation of 23 %. In addition, this PE widens the electrochemical stability window of the aqueous Na-ion supercapacitor up to 2.0 V since the water molecules are effectively confined via the strong interactions among components. Our research on sodium polymer electrolytes combined by nanoclusters and PVA holds significant promise for advancing solid-state sodium supercapacitors— a new generation of high-performance, safe, and cost-effective energy storage solutions.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118765"},"PeriodicalIF":4.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658170","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":"First principle studies of oxygen reduction reaction on boron doped X-graphene nanoflakes (X = N, P and S) electrocatalysts","authors":"Ravi Kumar","doi":"10.1016/j.jelechem.2024.118778","DOIUrl":"10.1016/j.jelechem.2024.118778","url":null,"abstract":"<div><div>Heteroatoms in boron doped X-graphene nanoflakes (X = N, P and S) generate active site on the surface of catalysts; make it interesting to explore for electrocatalytic oxygen reduction reaction (ORR) which is vital for fuel cell applications. Comparative ORR processes on three different boron doped X-graphene nanoflakes (X = N, P and S) electrocatalysts in acidic medium is explored in this study using the density functional theory. The conceptual analysis of structure, energy profile, NBO, FMO and DOS plots is presented. Our results revealed that boron doped P-graphene nanoflakes has excellent catalytic performance and favors the ORR the most.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118778"},"PeriodicalIF":4.1,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655327","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}