Journal of Electroanalytical Chemistry最新文献_第9页

CoF2-modified PEO-LLZTO composite polymer electrolyte to optimize Li+ transport pathway

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-21 DOI: 10.1016/j.jelechem.2025.119035

Hui Li , Hongfang Jiu , Lixin Zhang , Jinfeng Ma , Congli Wang , Sicong Che , Zhixin Guo , Yuxin Han , Luchao Yue , Fan Wu

{"title":"CoF2-modified PEO-LLZTO composite polymer electrolyte to optimize Li+ transport pathway","authors":"Hui Li , Hongfang Jiu , Lixin Zhang , Jinfeng Ma , Congli Wang , Sicong Che , Zhixin Guo , Yuxin Han , Luchao Yue , Fan Wu","doi":"10.1016/j.jelechem.2025.119035","DOIUrl":"10.1016/j.jelechem.2025.119035","url":null,"abstract":"<div><div>Solid-state lithium metal batteries face challenges when utilizing polymer solid-state electrolytes based on poly(ethylene oxide) (PEO), primarily because these materials exhibit low ionic conductivity at room temperature. A common method of modifying polymer electrolytes is to add LLZTO inorganic powder to a PEO matrix to form a composite polymer electrolyte (CPEs). However, PEO-LLZTO CPEs still suffer from ionic conductivity as well as lithium dendrite penetration problems. Therefore, constructing an ideal artificial interfacial layer is crucial to solve the above problems. In this paper, a bilayer heterogeneous SEI layer enriched with LiF inorganic components and Li-Co lithophilic alloys is constituted by adding CoF<sub>2</sub> commercial solid-state electrolyte additive to optimize the lithium homogeneous deposition behavior and accelerate the migration of lithium ions. The CoF<sub>2</sub>@CPEs prepared in the paper have an ionic conductivity of 5.10 × 10<sup>−4</sup> S·cm<sup>−1</sup>, a Li<sup>+</sup> ions migration of 0.32, and an electrochemical window of >4 V. In addition, the Li|CoF<sub>2</sub>@CPEs|Li symmetric cell can be stably cycled at a current density of 0.2 mA·cm<sup>−2</sup> for 1200 h. And the LFP|CoF<sub>2</sub>@CPEs|Li cell formed by pairing with LiFePO<sub>4</sub> (LFP) has good multiplication capability and cycling stability. The initial discharge specific capacity of the cell was 130.07 mAh·g<sup>−1</sup> at 0.5C, with 78.81 % capacity retention and 99.15 % average Coulombic efficiency after 200 cycles.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119035"},"PeriodicalIF":4.1,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vanadium-doped Prussian blue analogues as advanced cathode for sodium-ion batteries

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-19 DOI: 10.1016/j.jelechem.2025.119027

Wei Xu , Yanjiao Li , Peng Bao , Xueying Fu , Lizhuang Chen , Yingying Chen , Dongya Sun , Hongxun Yang

{"title":"Vanadium-doped Prussian blue analogues as advanced cathode for sodium-ion batteries","authors":"Wei Xu , Yanjiao Li , Peng Bao , Xueying Fu , Lizhuang Chen , Yingying Chen , Dongya Sun , Hongxun Yang","doi":"10.1016/j.jelechem.2025.119027","DOIUrl":"10.1016/j.jelechem.2025.119027","url":null,"abstract":"<div><div>Prussian blue analogues (PBAs) have broad application prospects in the field of cathode electrode for sodium ion batteries (SIBs) because they can promote the insertion and extraction process of sodium ions. Unfortunately, PBAs exhibits poor cycling performance and low coulombic efficiency because of their large vacancy flaws and inadequate structural stability during the insertion/extraction of Na<sup>+</sup>. Herein, we have developed a series of vanadium-doped PBAs with different transition metal (Fe, Co, Ni) via chemical co-precipitation method combined with water bath process. Through rigorous regulation of transition metals, the designed sodium vanadium ferrohexacyanate (VFeHCF) exhibits optimal electrochemical properties, including an initial specific capacity of 110 mAh g<sup>−1</sup> at 20 mA g<sup>−1</sup> with a coulombic efficiency of 93.7 %, and a reversible capacity of 80 mAh g<sup>−1</sup> after 100 cycles with a capacity retention of 72.7 %, outperforming VCoHCF and VNiHCF. The enhancement in sodium storage can be attributed to the establishment of a stable Na<sup>+</sup> interspersion potential between V<sup>4+</sup> and Fe<sup>2+</sup>, as well as the extensive coordination environment of the iron ions, which promotes both electron transfer and Na<sup>+</sup> transport.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"983 ","pages":"Article 119027"},"PeriodicalIF":4.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel molybdenum disulfide (MoS2)-biopolymer-coated screen-printed carbon electrode for rapid and simple detection of manganese ions in water

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-19 DOI: 10.1016/j.jelechem.2025.119028

Jong-Hyun Baik , Zakariya Mohayman , Jae-Hoon Hwang , Jun Kim , Akihiro Kushima , Naoki Kanekawa , Eri Hasegawa , Woo Hyoung Lee

{"title":"A novel molybdenum disulfide (MoS2)-biopolymer-coated screen-printed carbon electrode for rapid and simple detection of manganese ions in water","authors":"Jong-Hyun Baik , Zakariya Mohayman , Jae-Hoon Hwang , Jun Kim , Akihiro Kushima , Naoki Kanekawa , Eri Hasegawa , Woo Hyoung Lee","doi":"10.1016/j.jelechem.2025.119028","DOIUrl":"10.1016/j.jelechem.2025.119028","url":null,"abstract":"<div><div>Monitoring manganese ions (Mn<sup>2+</sup>) in drinking water is crucial for public health and water quality management. Mn<sup>2+</sup> can cause discoloration, odor, or taste in tap water at concentrations above 0.05 mg L<sup>−1</sup> which is the U.S. Environmental Protection Agency's (EPA) secondary maximum contaminant level (SMCL). In this study, a novel molybdenum disulfide (MoS<sub>2</sub>)-biopolymer-coated electrochemical electrode was developed for rapid and sensitive Mn<sup>2+</sup> detection in water. The electrode, fabricated by electrodepositioning MoS<sub>2</sub> and chitosan onto screen-printed carbon electrode (SPCE), demonstrated a low detection limit of 1.03 μg L<sup>−1</sup> in 0.2 M acetate buffer solution (pH 4.5) using square wave adsorptive cathodic stripping voltammetry (SWAdCSV) with the optimized operational parameters: a deposition potential of +0.9 V, a deposition time of 300 s, an amplitude of 75 mV, and a frequency of 50 Hz. Simplified calibration curves were developed to reduce the need for frequent recalibrations, enabling practical applications in diverse water sources. Tests using real water samples achieved recoveries of 94–107 %, confirming the electrode's field applicability. This eco-friendly and cost-effective electrode provides a viable alternative to traditional laboratory-based spectrometric methods for Mn<sup>2+</sup> monitoring, offering high sensitivity, portability, and potential widespread environmental applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"983 ","pages":"Article 119028"},"PeriodicalIF":4.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Why impedance model/characteristics of porous electrodes for supercapacitors can be formulated into single pore mode?

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-19 DOI: 10.1016/j.jelechem.2025.119029

Qiu-An Huang , Zijie Wu , Jia Wang , Weiheng Li , Jiujun Zhang

{"title":"Why impedance model/characteristics of porous electrodes for supercapacitors can be formulated into single pore mode?","authors":"Qiu-An Huang , Zijie Wu , Jia Wang , Weiheng Li , Jiujun Zhang","doi":"10.1016/j.jelechem.2025.119029","DOIUrl":"10.1016/j.jelechem.2025.119029","url":null,"abstract":"<div><div>There have existed several multi-scale impedance models for the porous electrode of supercapacitors (SCs) in literature. However, sometimes the multi-scale impedance model is too complex in mathematics to be easily used in the impedance diagnosis for SCs. Actually, impedance models and the corresponding characteristics of porous electrodes for SCs more often adopt single pore mode instead of the bi-scale mode to simplify the model construction and facilitate the understanding. Currently, there is one doubt for above degeneration, i.e., is this simple and rough approximation for the bi-scale impedance model reasonable and feasible? Based on the rigorous numerical calculations, this work gives a theoretical deduction for the bi-scale impedance model to be formulated into single pore mode. The numerical calculations yield two aspects of important understandings over the whole interested frequency range of 0.01 Hz ∼ 10 kHz under actual application background: (i) impedance model for the single pore can be degenerated into a pure resistor connected in series with a pure capacitor; and (ii) the impedance from the equivalent capacitor is three-order larger than that from the equivalent resistor. Based on the above understandings, the bi-scale impedance model for the porous electrode can be successfully formulated into single pore mode. The degenerated impedance model of the porous electrode not only contains rich information at the multiple scales, but is also mathematically easy to apply.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119029"},"PeriodicalIF":4.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The electrochemical hydroxylation of H-terminated n-Si as revealed by a generalized phase analysis of EIS: Real time detection

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-19 DOI: 10.1016/j.jelechem.2025.119025

Aldo Matthaeus Cutrim Gomes , Carleane Patrícia da Silva Reis , Daiana Silva , Muriel de Pauli , Rafael Bento Serpa , Francoise Toledo Reis , Everton Fabian Jasinski , Maria Luisa Sartorelli

{"title":"The electrochemical hydroxylation of H-terminated n-Si as revealed by a generalized phase analysis of EIS: Real time detection","authors":"Aldo Matthaeus Cutrim Gomes , Carleane Patrícia da Silva Reis , Daiana Silva , Muriel de Pauli , Rafael Bento Serpa , Francoise Toledo Reis , Everton Fabian Jasinski , Maria Luisa Sartorelli","doi":"10.1016/j.jelechem.2025.119025","DOIUrl":"10.1016/j.jelechem.2025.119025","url":null,"abstract":"<div><div>Based on the conceptual generalization of a constant phase element (CPE) an improved set of fractional-order functions is defined to describe the flow and accumulation of charge in an electrochemical interface, as measured by EIS. The so-called <em>gpe</em> method has five major advantages: (i) it is a differential analysis, which enables the detection of subtle faradaic reactions; (ii) it generates a dispersionless interfacial capacitance whenever the system is in a blocking state; (iii) it gives a better estimate for the electric double layer capacitance than the widely accepted Brug's expression; (iv) it allows real-time tracking of a moderately fast evolving system; (v) it is model-free. The far-reaching benefits of the <em>gpe</em> method will be demonstrated by analyzing the impedance evolution of an H-terminated n-Si (100) electrode under the action of a staircase anodic potential scan in a fluoride-free aqueous electrolyte in the dark. It will be shown that this interface undergoes an electrochemical hydroxylation reaction involving a hole, a dangling bond and an electron.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119025"},"PeriodicalIF":4.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unveiling the characteristic EIS fingerprint of the ion-transfer process in air electrodes for solid oxide cells

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-18 DOI: 10.1016/j.jelechem.2025.119026

Davide Cademartori

{"title":"Unveiling the characteristic EIS fingerprint of the ion-transfer process in air electrodes for solid oxide cells","authors":"Davide Cademartori","doi":"10.1016/j.jelechem.2025.119026","DOIUrl":"10.1016/j.jelechem.2025.119026","url":null,"abstract":"<div><div>The development of high-performing electrodes for the new generation of solid oxide cells requires in-depth understanding of the physical processes that lie behind their resistive contributions. The performance limitation provided by the ion-transfer step scales with the properties of the electrode-electrolyte heterointerface and must be optimized to increase the cells durability. During long-term testing, the electrode dynamic response can be affected by the increased limitation of the ion-transfer step due to the delamination of the electrode from the electrolyte or the generation of secondary phases. In this study, a 1-D physics-based model is used to unravel the characteristic fingerprint of the ion-transfer process in impedance spectra. The model reproduces the qualitative dynamic behavior of LSCF and LSCF-CGO air electrodes and perform sensitivity analyses to elucidate the role played by the electrode-electrolyte adherence and the governing kinetic regime. The effect provided by a parallel reaction pathway and its identifiability in experimental data were also investigated. The obtained simulations highlight that the ion-transfer resistive peak can emerge in the 10<sup>4</sup>–10<sup>6</sup> Hz range, depending on the electrode kinetics and surface properties. Furthermore, in experimental data, its characteristic contribution can be masked by the wires inductance and result as a higher ohmic resistance.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119026"},"PeriodicalIF":4.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel electrochemical sensor for detection of cysteine based on a Methacrylic Ester compound probe 基于甲基丙烯酸酯化合物探针的新型半胱氨酸检测电化学传感器

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-18 DOI: 10.1016/j.jelechem.2025.119024

Jing Chen , Xia Gu , Hao Yang , Dandan Wang , Yafei Li , Hua Ma , Xue Mi , Yu Huang , Yanru Fan

{"title":"A novel electrochemical sensor for detection of cysteine based on a Methacrylic Ester compound probe","authors":"Jing Chen , Xia Gu , Hao Yang , Dandan Wang , Yafei Li , Hua Ma , Xue Mi , Yu Huang , Yanru Fan","doi":"10.1016/j.jelechem.2025.119024","DOIUrl":"10.1016/j.jelechem.2025.119024","url":null,"abstract":"<div><div>1,4-bis(2-methacryloxy)benzene (BMOB) was synthesized through a facile one-step reaction and was used as an electrochemical probe for the selective determination of cysteine. BMOB reacted with the sulphydryl group of cysteine by a Michael addition reaction, then underwent the intramolecular cyclization reaction and released the electroactive phenolic substance. The accurate determination of cysteine was realized by detecting the oxidation electrical signal of the electroactive phenolic substance on the bare glassy carbon electrode. The reaction mechanism between BMOB and cysteine was proved by high-resolution mass spectrum and differential pulse voltammetry. The experimental conditions were optimized to obtain higher sensitivity. A plot of peak current versus cysteine concentration exhibited a well-linear relationship in the range of 5.0 μM - 100.0 μM, with a correlation coefficient of 0.9978. The limit of detection was calculated to be 0.29 μM (S/N = 3). BMOB was insensitive to 6-Mercapto-1-hexanol, homocysteine and glutathione, indicating relatively high selectivity. The developed electrochemical sensor based on BMOB-cysteine reaction successfully detected cysteine in spiked rat serum and Paediatric Compound Amino Acid Injection(18AA-I)with high selectivity, reproducibility and accuracy. Compared with other complicated analytical methods or tedious electrode modification processes, this work provided a simple and convenient approach for the accurate detection of cysteine on traditional unmodified electrodes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"983 ","pages":"Article 119024"},"PeriodicalIF":4.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic effect of Nitrogen and Boron co-doped porous actived carbon encapsulated NiCo2O4 nanosphere composite for enhanced Oxygen Eevolution Reaction

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-18 DOI: 10.1016/j.jelechem.2025.119023

S. Nagarani , Moorthy Krishnamachari , Mohanraj Kumar , Jih-Hsing Chang , N. Balagowtham

{"title":"Synergistic effect of Nitrogen and Boron co-doped porous actived carbon encapsulated NiCo2O4 nanosphere composite for enhanced Oxygen Eevolution Reaction","authors":"S. Nagarani , Moorthy Krishnamachari , Mohanraj Kumar , Jih-Hsing Chang , N. Balagowtham","doi":"10.1016/j.jelechem.2025.119023","DOIUrl":"10.1016/j.jelechem.2025.119023","url":null,"abstract":"<div><div>There is a growing interest in developing highly efficient, cost-effective, and noble metal-free electrocatalysts. In this study, we synthesized porous activated carbon (AC) derived from waste <em>Agathis dammar</em> cone biomass, co-doped with nitrogen (N) and boron (B), and encapsulated with NiCo₂O₄ nanosphere composites using simple hydrothermal and pyrolysis methods. Characterization results reveal that the incorporation of N and B atoms into the AC lattice significantly enhances the material's surface and electronic structure, improving electron conductivity and increasing the number of active sites. The porous nature of the AC, combined with the synergistic effect of the NiCo₂O₄ binary metal oxide, results in exceptional oxygen evolution reaction (OER) performance, achieving a low overpotential of 289 mV and a small Tafel slope of 84.5 mV dec<sup>-1</sup> at 10 mA cm<sup>-2</sup> in 1 M KOH alkaline medium. Additionally, the N, B-AC/NiCo₂O₄ electrode exhibits excellent stability, maintaining performance for over 50 h. This work demonstrates a promising strategy for synthesizing efficient, noble metal-free electrocatalysts from waste biomass, offering significant potential for future energy production technologies.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"983 ","pages":"Article 119023"},"PeriodicalIF":4.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ti3C2Tx MXene-based (Cobalt–Vanadium) bimetallic sulfides 0D@2D heterostructure composite for asymmetric supercapacitor application

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-17 DOI: 10.1016/j.jelechem.2025.119002

Mahmoud Dardeer , Kisan Chhetri , Devendra Shrestha , Rupesh Kandel , Chan Hee Park

{"title":"Ti3C2Tx MXene-based (Cobalt–Vanadium) bimetallic sulfides 0D@2D heterostructure composite for asymmetric supercapacitor application","authors":"Mahmoud Dardeer , Kisan Chhetri , Devendra Shrestha , Rupesh Kandel , Chan Hee Park","doi":"10.1016/j.jelechem.2025.119002","DOIUrl":"10.1016/j.jelechem.2025.119002","url":null,"abstract":"<div><div>2D MXenes are receiving a significant attention in the energy-storage sector, owing to their high surface redox reactivity, hydrophilicity, multi-layered sheet structure, and high conductivity. However, MXenes are subjected to sheets restacking which decrease the number of surface-active sites, and thus limits their capacity value. In this work, CoVS<sub>2</sub> NPs are in-situ grown over the Ti<sub>3</sub>C<sub>2</sub>T<em><sub>×</sub></em> nanosheets using a facile hydrothermal technique. The insertion of the nanoparticles can reduce the restacking of the sheets and creating abundant active sites. As a cathode material for the (ASCs) application, the CoVS<sub>2</sub>@MXene hybrid electrode achieves a high specific capacity value of 423 mAh g<sup>−1</sup> at 1 A g<sup>−1</sup>, with an outstanding cycling stability of more than 93 % capacity retention after 5000 working cycles. Moreover, the obtained CoVS<sub>2</sub>@MXene//VS<sub>2</sub>@MXene ASC device provides a significant energy density of ∼57.78 W h kg<sup>−1</sup> at 832 W kg<sup>−1</sup> power density, and 90.3 % capacity retention. Such results indicate that the CoVS<sub>2</sub>@MXene hybrid material offers excellent potential for future development of a new MXene-based supercapacitor devices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"982 ","pages":"Article 119002"},"PeriodicalIF":4.1,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of cyclic voltammograms for 3D diffusion-controlled growth and dissolution of new phase nuclei

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2025-02-16 DOI: 10.1016/j.jelechem.2025.119020

Olga V. Grishenkova , Alexander V. Kosov

{"title":"Simulation of cyclic voltammograms for 3D diffusion-controlled growth and dissolution of new phase nuclei","authors":"Olga V. Grishenkova , Alexander V. Kosov","doi":"10.1016/j.jelechem.2025.119020","DOIUrl":"10.1016/j.jelechem.2025.119020","url":null,"abstract":"<div><div>The regularities of diffusion-controlled growth and dissolution of a large random ensemble of hemispherical nuclei on an indifferent macroelectrode surface are analyzed using the proposed model under potential sweep conditions. The model considers the relationship between the concentration profiles to the nucleus due to spherical diffusion and to the electrode due to planar diffusion, and the distribution function of Voronoi cell areas. The simulated cyclic voltammograms (CVs) reproduce all the characteristic features of experimental CVs for 3D nucleation/growth processes. The influence of the number density of nuclei and scan parameters on the calculated CVs is studied. It is shown that an increase in the scan rate and a decrease in the number density of nuclei can lead to a significant transformation of the CV cathodic part up to the formation of a current loop. Furthermore, a shift of the peak potential in the cathodic direction can be observed as the scan rate increases in the case of 3D diffusion-controlled growth. The discrepancy with the Berzins-Delahay model is discussed and an approach is proposed for determining the diffusion coefficient of depositing ions in the case of a nonlinear dependence of the peak current density on the square root of the scan rate. The influence of the Voronoi cell area and scan parameters on the nucleus size evolution and size distribution is analyzed.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"982 ","pages":"Article 119020"},"PeriodicalIF":4.1,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0