Electrochimica Acta最新文献

{"title":"Decorative separator with spongy morphology polyaniline enables dendrite free zinc ion hybrid supercapacitor","authors":"Mostafa M. Mohamed, Arshad Hussain, Yuda Prima Hardianto, M. Nasiruzzaman Shaikh, Md. Abdul Aziz","doi":"10.1016/j.electacta.2024.145545","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145545","url":null,"abstract":"Aqueous zinc-ion hybrid supercapacitors (ZHSCs) have arose as a favourable energy storage device because of their low cost, excellent safety profile, and eco-friendly nature. Unfortunately, the device shorts out due to the glass fiber's strong affinity for zinc ions, which causes zinc dendrites to develop towards the separator. An innovative approach of controlling zinc deposition behaviors through the use of pyrolysis polyaniline functionalized glass fiber (GF-PANI) separator is presented here. Zinc ion flow and deposition behavior are both controlled by the porous PANI structure, which serve to confine the ions. Abundant nitrogen-containing functional groups have the ability to absorb molecules of water. This greatly enhances the zinc anode's reversibility and safety features. Consequently, GF-PANI separators based Zn/Zn symmetric cells have a higher cycle life, lasting up to 800 hours at 2 mA cm⁻² and 1 mA h cm⁻² (120 h). Furthermore, a Zn/JAC cell with GF-PANI separator demonstrates a good specific capacity even after 40000 cycles at 10 A g⁻¹ in comparison to Zn/GF/JAC cells. This study investigated the design of synergistic, economical, and efficient separators for ZHSCs.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"25 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-dimensional parametric investigation of zinc-air fuel cell with flowing electrolyte by numerical method","authors":"Minh-Khoa Nguyen, K. David Huang","doi":"10.1016/j.electacta.2024.145548","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145548","url":null,"abstract":"Parametric investigation ensures the optimal design and commercialization of high-quality products. This study employs numerical approach to evaluate the performance of a zinc-air fuel cell, focusing on the influence of design and operational parameters. A transient two-dimensional (2D) mathematical model, incorporating the effect of flowing potassium hydroxide (KOH) electrolyte is developed and verified against experimental data, which has not been widely reported. The study examines four key parameters including anode size, electrolyte inlet velocity, concentration of hydroxide ions (OH^-) and zincate ions (Zn(OH)₄^2-), which significantly impact the current density distribution, temperature variation, zinc oxide (ZnO) formation and potential gradient within the cell. Unlike earlier studies focusing on 0D and 1D models, this 2D model integrates fluid motion dynamics of the flowing electrolyte and is considered non-isothermal, providing a closer approximation to practical applications. With detailed spatial consideration, the proposed model is able to predict the complex phenomena inside the cell more accurately and reliably. The outcome of this work further facilitates the development, optimization and commercialization of this potential zinc-air fuel cell product.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"201 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High quality surfaces of magnesium alloy AZ31 by adjusting appropriate electropolishing parameters","authors":"Jessica Kloiber, Viktoria Anetsberger, Ulrich Schultheiß, Helga Hornberger","doi":"10.1016/j.electacta.2024.145547","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145547","url":null,"abstract":"Magnesium alloy AZ31 is a light material with a good mechanical stability and is used in various engineering applications. Although its tendency to localized corrosion is a limiting factor in its use. Electropolishing is a widely used process for improving the surface roughness and corrosion behavior of metals. However, there is a lack of knowledge about the electropolishing of magnesium and its alloys. In this study, an optimal electropolishing process for AZ31 was developed to improve the surface properties by varying the electrolyte concentration and the applied potential. The electrolyte composition was a mixture of phosphoric acid, ethanol and deionized water. The applied potentials were selected based on measured current density potential curves. Thereby, electropolishing was performed up to an electric charge of 18 As. The experimental results indicate that the electropolishing process should be carried out at a low current density to avoid bubble evolution and surface defects. Therefore, the concentration of the electropolishing electrolyte should have an appropriate low conductivity, and the applied potential should be in the transient or passive region of the polarization curve recorded prior to electropolishing. It could be shown that an optimized electropolishing process improved the surface of AZ31 by providing a bright and mirror-like surface and a lower roughness compared to a mechanically ground surface.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"13 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and exploring the synergistic potential of Ni-Co2-S4/rGO composite electrode for high performance flexible hybrid supercapacitors","authors":"A. Premkumar, B. Sridevi, K.S. Mohan, RM. Gnanamuthu","doi":"10.1016/j.electacta.2024.145519","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145519","url":null,"abstract":"A one-step hydrothermal method is employed to synthesize a composite of nickel-cobalt sulfide (NiCo₂S₄) integrated with reduced graphene oxide (rGO) as an electrode for energy storage applications in the supercapcitor. The distribution of NiCo₂S₄ nanoparticles on the rGO surface is optimized to be enhance the supercapacitor performance. The resulting NiCo₂S₄/rGO composite showed impressive electrochemical characteristics such as capacitance (C) and specific capacitance (Cs) of 1950 F g⁻¹ at a current density of 1 Ag⁻¹. Furthermore, investigation of constructing a hybrid supercapacitor (HSC) using a NiCo₂S₄/rGO positive electrode and a graphene oxide (GO) as negative electrode, respectively. In the configuration achieved exceptional specific energy (Es) of 41.52 W h kg⁻¹ at a specific power (Ps) of 1067 W kg⁻¹, surpassing previous NiCo₂S₄ based supercapacitors. The HSC maintained an Es of 36.51 Wh kg⁻¹ at a Ps of 2065 W kg⁻¹ and exhibited an outstanding cycling stability also retaining 82% of its capacitance after 3000 charge-discharge cycles. Thus, the prepared materials are findings of the NiCo₂S₄/rGO composite one of suitability for advanced supercapacitors.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"7 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MoF-derived CuCo2S4@FeS2 nanohybrids for supercapacitor applications","authors":"Perumal Naveenkumar, Munisamy Maniyazagan, Nayoung Kang, Hyeon-Woo Yang, Sun-Jae Kim","doi":"10.1016/j.electacta.2024.145546","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145546","url":null,"abstract":"Metal-organic framework-derived CuCo₂S₄ nanomaterials are a potential target for supercapacitors, because of their structural and electrochemical features. In this study, we constructed nanohybrids of MoF-derived CuCo₂S₄ nanoparticles@FeS₂ nanoplates using a solvothermal method. The presence of conductive carbon in the MoF-derived CuCo₂S₄ nanoparticles increases their electrical conductivity. MoF-derived CuCo₂S₄ exhibited a nanoparticle morphology and FeS₂ exhibited a nanoplate morphology in HR-TEM resutls. The good surface area, porous structure with increseaed pore diameter of the hybrids of the CuCo₂S₄@FeS₂ are offers the good super-capacitor performances. Nanostructured electrode materials have shortened ion diffusion paths and larger the contact areas for electrolyte ions. In a conventional three-electrode system, the hybrids of the CuCo₂S₄@FeS₂ electrode delivered a capacity of 400.10 C g^-1 at 1A g^-1. Even, at a high current density of 10 A g^-1, it delivered 210.19 C g^-1 with an exceptional rate capability. Herein, the long-standing ability study demonstrated good capacity retention of 89.41 % after 5500 cycles. Furthermore, the AC//CuCo₂S₄@FeS₂ device has a working voltage window of 0 - 1.5 V, and delivered the high capacity of 204.77 C g^-1 @ 1 A g^-1. After 10000 cycles, 90.01% capacity was retained at 5 A g^-1 with a coulombic efficiency of 95.63 %. AC//CuCo₂S₄@FeS₂ exhibited a maximum energy density of 63.99 Wh kg^-1 at a power density of 1125 W kg^-1 (1 A g^-1), when increasing the current density to 5A g^-1, the device maintained its energy/power density of 17.61 Wh kg^-1 / 5625 W kg^-1, respectively. Consequently, the exceptional characteristics exhibited by hybrids of CuCo₂S₄@FeS₂ have established them as dependable contenders for implementation in supercapacitors.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"23 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability of the Au/electrolyte interface during hydrogen evolution: A Cyclic Plasmo-Voltammetry study","authors":"Moritz J. Feil, Simon Leisibach, Markus Becherer, Katharina Krischer","doi":"10.1016/j.electacta.2024.145509","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145509","url":null,"abstract":"Metal-electrolyte interfaces are dynamic entities, the potential and electrolyte dependent mobility of the metal atoms leading to surface restructuring with possible dissolution and degradation. In this work, we investigate the stability of the Au/aqueous electrolyte interface with in situ differential Cyclic Plasmo-Voltammetry (dCPV), augmented by ex situ atomic force microscopy and finite differential time domain simulations. We demonstrate that even the onset of hydrogen evolution is accompanied by pronounced morphological changes of the interface which are by far more prominent than those occurring during Au oxidation and reduction. Furthermore, the stability of the interface heavily depends on pH, the degradation of the electrode being considerably stronger in acidic than in neutral electrolyte. In addition, a clear hydrogen adsorption peak was observed in neutral electrolytes during the cathodic scan, which was more pronounced on a freshly prepared Au electrode than on an aged one. The measured dCPVs in acidic and neutral electrolytes can be explained consistently assuming that (1) adsorbed hydrogen is absorbed into the subsurface region of the Au electrode once HER starts; its subsequent removal as molecular hydrogen causes morphological changes; (2) in the presence of metal cations, adsorbed hydrogen is stabilized through the formation of ternary metal hydrides on the gold surface that stabilize the surface Au-H bonds and hinder further absorption of H into the subsurface region as well as the release of hydrogen into the electrolyte.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"264 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “An experimentally validated numerical model of pH changes in surrogate tissue induced by electroporation pulses” [Electrochimica Acta, Volume 511, 2025, 145363]","authors":"Rok Šmerc, Damijan Miklavčič, Samo Mahnič-Kalamiza","doi":"10.1016/j.electacta.2024.145506","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145506","url":null,"abstract":"It has come to our attention that one of the curves was missing in <span><span>Fig. 7</span></span>d in the final published version of our paper. The correct Figure is below.<figure><span><img alt=\"Figure 7:\" aria-describedby=\"cap0001\" height=\"441\" src=\"https://ars.els-cdn.com/content/image/1-s2.0-S0013468624017420-gr1.jpg\"/><ol><li><span><span>Download: <span>Download high-res image (726KB)</span></span></span></li><li><span><span>Download: <span>Download full-size image</span></span></span></li></ol></span><span><span><p><span>Figure 7</span>. Comparison of the calculated and experimentally determined pH distributions for 8 rectangular pulses with a duration of 10 ms and a pulse repetition rate of 1 s^-1. The amplitude of the pulses was 200 V in (a) and (b), and 400 V in (c) and (d). The results for the unbuffered medium are shown in (a) and (c), while the results for the buffered medium are shown in (b) and (d). The results are shown for a time of 60 seconds to also include the effect of diffusion in the analysis. The dashed lines represent the results of the models where the diffusion coefficients were reduced to 50% of the values given in Table 1. The anode is located on the left (at 0 mm), and the cathode on the right (at 14.3 mm).</p></span></span></figure>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"74 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Description of ions properties using molecular orbital energy levels: Trends in interaction with model electrodes and solvents","authors":"Sergey V. Doronin","doi":"10.1016/j.electacta.2024.145541","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145541","url":null,"abstract":"The study reveals correlations between the parameters of ions and their HOMO and LUMO orbital energy level values. In particular, it demonstrates a clear correlation for the ion adsorption parameters on model electrodes: the aluminum oxide (0001) surface, graphene and Au (111) surface. Correlations are also observed for the parameters of ion binding to water and dimethyl carbonate molecules, which are often used as solvents. In addition, the dipole moment, polarizability and solvation energy of ions are well correlated with the values of the molecular orbital energies, and for anions a dependence on the oxidation potential is observed. The experimental ion parameters reported in the literature also show correlations with the energy levels of the ion orbitals. The obtained descriptors make it possible to select ions with desired values for a specific problem. As an illustrative example, in this work we consider the problem of displacement of water molecules from the inner electric double layer by ions, which is one of the factors increasing the potential window in electrolytes of aqueous batteries. This approach can be applied in the rapidly developing field of aqueous electrolytes for battery or supercapacitor design, catalysis control through surface composition variations, as well as in studies of heavy metal ion binding to sorption materials.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"11 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scanning impedance microscopy under oxygen reduction reaction conditions. Proof of the concept","authors":"Christian Schott, Luis Hofbauer, Elena Gubanova, Peter Schneider, Aliaksandr Bandarenka","doi":"10.1016/j.electacta.2024.145533","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145533","url":null,"abstract":"In this study, we demonstrate that localized electrochemical impedance spectroscopy (LEIS) can successfully probe the solid-liquid interface of a model gold surface in low-concentrated aqueous electrolytes. The approach utilizes scanning electrochemical microscopy (SECM) under potential control of the sample, marking a notable improvement over previous SECM-based LEIS studies, which were conducted under open circuit potential conditions. The accuracy of the results was validated by comparing the interfacial parameters, such as the double-layer capacitance minimum and the potential of zero charge, with the results obtained from conventional global measurements. Additionally, local kinetic parameters for the oxygen reduction reaction (ORR) were examined <em>via</em> LEIS by fitting the acquired impedance spectra to a simplified, physical equivalent circuit model. Gold was chosen as a model surface for the ORR with its well-defined ORR potential region due to the absence of hydrogen adsorption and overlapping OH⁻ adsorption. The local kinetic parameter determined from the LEIS experiments corresponds to the apparent rate coefficient (k_app) of the ORR, reflecting the average k_app of individual active sites within the probed area. The dependence of k_app on the ORR overpotential aligns well with the kinetics of the 2-electron reduction of O₂ taking place at the gold sample.This proof-of-concept study demonstrates that SECM-based LEIS serves as a powerful tool for the advanced characterization of complex electrochemical interfaces for future experiments, especially those with heterogeneities or different structures/materials.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"114 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eliminate voltage decay of LiCoO2 at 4.6 V through a combined bulk and surface reconfiguration","authors":"Xu Xue, Yaru Zhao, Zhi Wang, Yufei Zhang, Chenchen Li","doi":"10.1016/j.electacta.2024.145540","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145540","url":null,"abstract":"LiCoO₂ is an imperative cathode material for lithium-ion batteries due to its high discharge voltage and volumetric energy density. However, the practical application of LiCoO₂ at high voltage is greatly limited by the detrimental phase transition and interfacial side reactions. Herein, a combined bulk and surface reconfiguration via K⁺–Mg²⁺–Al³⁺–Ti⁴⁺ multi-ion doping and AlPO₄ coating is proposed to design high-voltage LiCoO₂ single crystals. This strategy can significantly change the morphology and microstructure of LiCoO₂, resulting in obviously increased Li⁺ diffusion kinetics and improved structural stability when charged to 4.6 V. In addition, the AlPO₄ coating layer can mitigate the cathode/electrolyte side reactions and contribute to form a robust LiF- and Li₃PO₄-rich cathode/electrolyte interphase during long-term cycling. As a result, voltage decay, particle cracks and the detrimental phase transition up to 4.6 V are effectively inhibited. The modified LiCoO₂ delivers a high discharge capacity of 136 mAh g^–1 at 10 C with outstanding capacity retention of 85.4% and negligible voltage decay after 1000 cycles. This work can be enlightening for designing stable high-voltage cathode materials for lithium-ion batteries with long lifespan.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"16 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}