Electrochimica ActaPub Date : 2025-09-28DOI: 10.1016/j.electacta.2025.147471
Jinseok Hong, Seung-Yong Lee, Lijun Wu, Altug S. Poyraz, Jianping Huang, Amy C. Marschilok, Esther S. Takeuchi, Kenneth J. Takeuchi, Yimei Zhu
{"title":"Probing the Role of Local Tunnel Variations in Early-Stage Lithiation of α-MnO₂ Nanowires via In Situ TEM","authors":"Jinseok Hong, Seung-Yong Lee, Lijun Wu, Altug S. Poyraz, Jianping Huang, Amy C. Marschilok, Esther S. Takeuchi, Kenneth J. Takeuchi, Yimei Zhu","doi":"10.1016/j.electacta.2025.147471","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147471","url":null,"abstract":"Understanding lithium-ion transport in tunnel-structured manganese oxides is essential for designing high-performance lithium-ion battery electrode materials. Here, we elucidate the early-stage lithiation mechanism of potassium-stabilized α-MnO<sub>2</sub> nanowires using <em>in situ</em> transmission electron microscopy (TEM) coupled with electron energy-loss spectroscopy (EELS), high-resolution TEM (HRTEM), and geometric phase analysis (GPA). Real-time TEM imaging reveals clear volume expansion at the reaction front, while EELS analysis uncovers lithium-ion diffusion far beyond this region, where no visible expansion is observed, indicating fast, defect-assisted transport. GPA and HRTEM analyses show that localized tensile and compressive strain fields, originating from pre-existing local tunnel structural variations, persist after lithiation. The tensile-strained regions enable lithium-ion insertion with minimal lattice distortion, offering additional free volume that facilitates rapid lithium-ion accommodation ahead of the structural transformation. Our results demonstrate a local tunnel variation-mediated fast diffusion pathway that precedes bulk reaction, underscoring the critical role of local strain in enabling early-stage lithium transport. Given the structural versatility of MnO<sub>2</sub> and its ability to accommodate diverse atomic arrangements beyond the well-known tunnel phases (β-, γ-, δ-, λ-, R-phases), our findings highlight the importance of understanding and engineering local structural environments. This work provides fundamental insights into the interplay between defects, strain, and ion dynamics, and presents defect engineering as a promising approach to enhance both rate performance and structural stability in manganese-based cathodes.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"22 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183226","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}
Electrochimica ActaPub Date : 2025-09-27DOI: 10.1016/j.electacta.2025.147470
Sanam Garebaghi, Seyed Mohammad Taghi Gharibzahedi, Zeynep Altintas
{"title":"Recent advances of nanozyme-enhanced electrochemical biosensors for antibiotic detection in foods: Trends, opportunities, and challenges","authors":"Sanam Garebaghi, Seyed Mohammad Taghi Gharibzahedi, Zeynep Altintas","doi":"10.1016/j.electacta.2025.147470","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147470","url":null,"abstract":"Nanozyme (NZ)-enhanced electrochemical (EC) biosensors have significantly advanced as a result of the growing need for quick, sensitive, and on-site detection of antibiotic residues in food. This study thoroughly reviews the latest developments in NZ-based EC biosensors for the detection of antibiotics in food matrices, including conventional EC, electrochemiluminescence (ECL), photoelectrochemical (PEC), and dual-mode colorimetric-electrochemical (CM-EC) platforms. NZ-based biosensors have emerged as viable substitutes for traditional chromatographic techniques (such as HPLC and LC-MS/MS), which are still the gold standard for sensitivity and multi-residue analysis owing to their high cost, labor-intensive procedures, and lack of portability. Because of their enzyme-mimicking catalytic activity, NZs improve signal amplification, allowing for molecularly imprinted polymer (MIP) or aptamer recognition for ultrasensitive detection with low limits of detection and high specificity. Dual-mode CM-EC devices combine visual simplicity with quantitative precision, while ECL and PEC sensors further increase sensitivity by integrating light-driven processes and catalytic precipitation. Despite their advantages, challenges such as matrix effects, synthesis scalability, and cross-reactivity hinder widespread adoption. Miniaturization, smartphone integration, and increased uses in food safety monitoring are potential future developments.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"92 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183332","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}
Electrochimica ActaPub Date : 2025-09-27DOI: 10.1016/j.electacta.2025.147469
Chengjin Liu , Jiaxiang Wan , Linling Jiang , Zhicheng Yi , Zhiyan Wang , Jiajun Chen , Rui Li , Wei Xiao
{"title":"Effective collaborative strategy enabling stable interphase and crystal structure for high-performance Ni-rich single-crystal LiNi0.83Co0.11Mn0.06O2 cathode","authors":"Chengjin Liu , Jiaxiang Wan , Linling Jiang , Zhicheng Yi , Zhiyan Wang , Jiajun Chen , Rui Li , Wei Xiao","doi":"10.1016/j.electacta.2025.147469","DOIUrl":"10.1016/j.electacta.2025.147469","url":null,"abstract":"<div><div>To address the structural and interfacial degradation of Ni-rich layered cathodes, a collaborative strategy combining Ti<sup>4+</sup> ions doping with <em>in situ</em>-formed Li<sub>3</sub>PO<sub>4</sub> coating is designed to regulate and optimize Ni-rich single-crystal LiNi<sub>0.83</sub>Co<sub>0.11</sub>Mn<sub>0.06</sub>O<sub>2</sub> (SC-NCM-TP) cathode. The introduced Ti<sup>4+</sup> ions not only strengthen the crystal framework and inhibit harmful phase transition by forming stronger Ti-O bonds, but also boost Li<sup>+</sup> ions kinetics by expanding migration channels. Moreover, a uniform Li<sub>3</sub>PO<sub>4</sub> conductive coating with a thickness of about 3 nm, generated by converting surface residual lithium salts through NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub> treatment, enhances cathode/electrolyte interfacial stability. Benefiting from these advantages, the SC-NCM-TP based cell demonstrates exceptional capacity retention ratio of 90.3 % at 25 °C and 84.6 % at 60 °C after 100 cycles under 1.0 <em>C</em>, and maintains excellent capacity retention ratio of 81.3 % after 200 cycles even at 5.0 <em>C</em>. Hence, this work sheds new light on the design of advanced single-crystal cathodes for lithium-ion batteries.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147469"},"PeriodicalIF":5.6,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154049","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}
Electrochimica ActaPub Date : 2025-09-27DOI: 10.1016/j.electacta.2025.147472
{"title":"Electrochemical detection of fusion genes: Advancing cancer diagnosis and therapy","authors":"","doi":"10.1016/j.electacta.2025.147472","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147472","url":null,"abstract":"Fusion genes are formed by joining segments of two different genes through translocations, deletions, chromosomal insertions, or aberrant gene splicin…","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"1 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183225","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-performance MXene/reduced graphene oxide/carbon nanofibers@MoS2 composite films for flexible asymmetric supercapacitors","authors":"Lihua Chen, Ruidong Li, Bingyue Zheng, Shuxin Song, Huimin Shu, Dongtai Gao, Tingxi Li, Yong Ma","doi":"10.1016/j.electacta.2025.147468","DOIUrl":"10.1016/j.electacta.2025.147468","url":null,"abstract":"<div><div>Electrode materials for supercapacitors often suffer from limitations such as restricted ion accessibility, suboptimal cycling stability, and inadequate electrical conductivity, which compromise their electrochemical performance and practical utility. To overcome these challenges, strategic incorporation of intercalation materials to enhance ion transport and active site availability presents a viable approach. In this study, we used MoS<sub>2</sub> coated carbon nanofibers (CNFs) and reduced graphene oxide (rGO) nanosheets as intercalation agents to construct a strong 3D interlayer framework within MXene nanosheets and prepared MXene/rGO/CNF@MoS<sub>2</sub> composite films by vacuum-assisted filtration. The designed architecture notably enlarged the interlayer distance, facilitated rapid ion diffusion, and enhanced the availability of electroactive sites. The resulting film exhibited an exceptional specific capacitance of 1015 F g<sup>-1</sup> at 1 A g<sup>-1</sup>. Additionally, an asymmetric supercapacitor (ASC) was constructed with the composite film as the positive electrode and activated carbon (AC) as the negative electrode, delivering a broad operating voltage of 1.5 V and a capacitance of 212.7 F<sup>-1</sup> at 1 A g<sup>-1</sup>. The device reached an impressive energy density of 66.45 Wh kg<sup>-1</sup> at 750 W kg<sup>-1</sup>, while retaining 80.4% of its capacitance over 20,000 charge-discharge cycles at 5 A g<sup>-1</sup>, confirming outstanding long-term stability. This work demonstrates a scalable and effective strategy to enhance MXene-based electrodes, offering great potential for high-performance, flexible energy storage systems.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147468"},"PeriodicalIF":5.6,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154047","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}
Electrochimica ActaPub Date : 2025-09-25DOI: 10.1016/j.electacta.2025.147467
Noorhan F. AlShaikh Mohammad , Ebrahim Nemati-Kande , Ahmad A. Mousa , Mohammed S. Abu-Jafar , Asif Hosen , Awatif Alshamari , Jihad Asad
{"title":"Exploring the structural stability, optoelectronic characteristics, and H2 storage efficiency of ZBaGaH6 (Z = K, Rb, Cs) complex hydrides: A first-principles insight","authors":"Noorhan F. AlShaikh Mohammad , Ebrahim Nemati-Kande , Ahmad A. Mousa , Mohammed S. Abu-Jafar , Asif Hosen , Awatif Alshamari , Jihad Asad","doi":"10.1016/j.electacta.2025.147467","DOIUrl":"10.1016/j.electacta.2025.147467","url":null,"abstract":"<div><div>This work uses density functional theory (DFT) computations to investigate the structural, electronic, optical, mechanical, thermodynamic, and hydrogen storage features of the novel ZBaGaH<sub>6</sub> (Z = K, Rb, Cs) complex hydrides. All hydrides are dynamically stable, according to phonon dispersion studies, and crystallize in the cubic F4̅3m space group. Additionally, AIMD simulations at room temperature verify thermal robustness without structural deterioration. The impact of alkali metal substitution on band alignment and semiconducting character is shown by the electronic band structures, which display indirect band gaps. The VBM in ZBaGaH<sub>6</sub> (Z = K, Rb, Cs) shows flat bands with heavy holes (-2.6 to -3.0 mₑ) from H-localization, while the CBM displays dispersive Ba-d/Ga-s hybridization (44-58% d-orbital). Alkali metals tune properties: Cs widens the gap most (2.4-3.6 eV) via relativistic effects, whereas K minimizes distortion. These materials combine stable H-bonding (VBM) with mobile electrons (CBM), making Cs variants ideal for storage and K versions better for fast cycling, outperforming traditional hydrides in tunability and band separation. The mechanical analysis confirms that all the compounds adhere to the Born stability criteria, indicating a reduction in stiffness as one moves from K to Cs. The evaluation of optical properties reveals high dielectric constants, strong absorption in the UV range, and tunable refractive indices; among the studied compounds, KBaGaH<sub>6</sub> exhibits the highest optical activity. Based on the calculations, the hydrogen storage capacities are determined to be 2.40 wt% for KBaGaH<sub>6</sub>, 2.03 wt% for RbBaGaH<sub>6</sub>, and 1.75 wt% for CsBaGaH<sub>6</sub>. Our computational study demonstrates that ZBaGaH<sub>6</sub> hydrides are thermally robust, with decomposition enthalpies of ∼75 kJ/mol H<sub>2</sub> yielding desorption temperatures of 302–309°C. This stability is a key asset for their potential use in safe, solid-state hydrogen storage systems.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147467"},"PeriodicalIF":5.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134228","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}
Electrochimica ActaPub Date : 2025-09-25DOI: 10.1016/j.electacta.2025.147464
Ziwei Gan , Nengze Wang , Ming Zhang , Ze Wang , Jiandong Chen , Yi Wang , Zhijie Li
{"title":"Multi-component deep eutectic solvents achieve high stability zinc deposition and dissolution for electrochromic devices","authors":"Ziwei Gan , Nengze Wang , Ming Zhang , Ze Wang , Jiandong Chen , Yi Wang , Zhijie Li","doi":"10.1016/j.electacta.2025.147464","DOIUrl":"10.1016/j.electacta.2025.147464","url":null,"abstract":"<div><div>Electrochromic devices based on reversible metal deposition offer superior optical performance, with higher reflectivity and broader modulation ranges than conventional ion intercalation systems. Traditional devices use pre-deposited electrochromic layers on transparent conductive substrates, limited by material properties and ion migration rates. In contrast, metal deposition and dissolution devices achieve rapid, highly reversible color switching by directly controlling metal electrochemical deposition on transparent electrodes, expanding modulation range and response speed. This study proposes a multi-component deep eutectic solvent (MDES) electrolyte enabling reversible, efficient, dense zinc deposition, overcoming loose morphology, low transmittance, and low efficiency issues in aqueous electrolytes. MDES raises zinc nucleation overpotential, promotes fine, uniform particles, decreases light transmission, and enhances modulation depth; it also inhibits hydrogen evolution and zinc corrosion, improving stability and cycling. Trace Cu²⁺ further optimizes zinc kinetics, reduces interfacial polarization, and boosts reversibility and device efficiency. Using this electrolyte, a three-electrode multispectral device was assembled, showing four distinct optical states: fully transparent, semi-transparent blue, intermediate opacity, and nearly opaque. This enables dynamic visible and near-infrared light modulation, enhancing adaptive optical application potential. The work offers new design insights for metal-based reversible electrochemical systems, advancing smart windows, tunable filters, and energy-efficient displays with broad prospects.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147464"},"PeriodicalIF":5.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134227","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}
Electrochimica ActaPub Date : 2025-09-25DOI: 10.1016/j.electacta.2025.147466
Xuefu Che , Lele Wang , Zhen Peng , Zhangpei Chen, Jingshuai Yang
{"title":"Fluorinated poly(arylene ether)s functionalized by bulky imidazolium with excellent chemical stability for high-durability high temperature proton exchange membrane fuel cell applications","authors":"Xuefu Che , Lele Wang , Zhen Peng , Zhangpei Chen, Jingshuai Yang","doi":"10.1016/j.electacta.2025.147466","DOIUrl":"10.1016/j.electacta.2025.147466","url":null,"abstract":"<div><div>The development of polymer electrolyte membranes with superior chemical stability is critical for the widespread application and commercialization of high temperature proton exchange membrane fuel cells (HT-PEMFCs). Herein, we report the synthesis of fluorinated poly(aryl ether) (FPAE) copolymers via nucleophilic polycondensation of decafluorobiphenyl (DFBP) and methylhydroquinone, incorporating 4,4′-(hexafluoroisopropylidene)diphenol (6FDP) as a co-monomer. To enhance phosphoric acid (PA) doping capacity and simultaneously control dimensional swelling, bulky 1-decyl-2-methylimidazole (DeIm) groups are grafted onto the polymer backbone. The resulting homopolymer FPAE-DeIm membrane exhibits an excellent oxidative stability, retaining 68 % of their initial mass after 120 h in Fenton’s reagent (3 wt% H<sub>2</sub>O<sub>2</sub> + 4 ppm Fe<sup>2+</sup>) at 80 °C, vastly outperforming conventional DeIm-grafted poly(2,6-dimethyl-1,4-phenylene oxide), which degrades within 2 h. The introduction of rigid and hydrophobic poly(DFBP-6FDP) units further enhances chemical durability and suppresses volume swelling. Consequently, Co-FPAE<sub>0.65</sub>-DeIm exhibits an optimal balance of properties: 73 % mass retention after Fenton test, a volume swelling of 55 % in 85 wt% PA at 150 °C, a tensile strength of 15.5 MPa at room temperature, and a proton conductivity of 78.3 mS cm<sup>-1</sup> at 180 °C. Remarkably, under constant current operation (200 mA cm<sup>-2</sup>) at 160 °C in dry H<sub>2</sub>/air without backpressure, the membrane showed no signs of degradation over a 617-hour test. During this period, the peak power density increased from 319 to 420 mW cm<sup>-2</sup>, while the cell voltage improved from 0.633 V to 0.683 V. These results position Co-FPAE<em><sub>x</sub></em>-DeIm membranes as highly durable and efficient HT-PEMs, underscoring the potential for long-term operation in HT-PEMFCs.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147466"},"PeriodicalIF":5.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134516","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}
Electrochimica ActaPub Date : 2025-09-24DOI: 10.1016/j.electacta.2025.147462
Junjie Zhao , Jian Wu , Ming Zhang , Longteng Qu , Tian Wang , Zhuoran Xu , Ruzhi Wang
{"title":"Copper doped cobalt sulfide hollow polyhedron as efficient bifunctional catalysts for overall water splitting: An experimental and theoretical study","authors":"Junjie Zhao , Jian Wu , Ming Zhang , Longteng Qu , Tian Wang , Zhuoran Xu , Ruzhi Wang","doi":"10.1016/j.electacta.2025.147462","DOIUrl":"10.1016/j.electacta.2025.147462","url":null,"abstract":"<div><div>The development of highly active bifunctional electrocatalysts holds immense significance for achieving efficient overall water splitting. In this work, we successfully synthesize a novel Cu-doped cobalt sulfide hollow polyhedron through an ion-exchange-assisted solvothermal strategy. This catalyst exhibits excellent bifunctional electrocatalytic performance for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). Experimental characterization combined with density functional theory (DFT) calculations reveals a synergistic enhancement mechanism. Cu doping promotes surface reconstruction into the formation of active cobalt oxyhydroxide species, which significantly boosts the density of active sites, optimizes the adsorption energetics of reaction intermediates, reduces the energy barrier of rate-determining steps, and activates the lattice oxygen mechanism (LOM). As a result, it facilitates enhanced OER kinetics. The optimized catalyst, designated as CCS - 2, achieves low overpotentials of 132 mV for HER, outperforming its undoped counterpart by approximately 14 %. For OER, it attains an overpotential of 279 mV, surpassing IrO<sub>2</sub> by about 18 %. When deployed in a two-electrode electrolyzer, the CCS-2 || CCS-2 system reaches a current density of 10 mA cm⁻² at a very low cell voltage of 1.63 V, comparable to the noble-metal benchmark Pt/C || IrO₂ (1.62 V). These findings demonstrate the great potential of CCS-2 as a highly efficient bifunctional electrocatalyst for practical water splitting applications. Moreover, they offer valuable insights into innovative design principles for advancing bifunctional water-splitting electrocatalysts.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147462"},"PeriodicalIF":5.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134230","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":"Unveiling complex lithiation/delithiation mechanism in AgNbO3 model perovskite using operando X-ray absorption spectroscopy","authors":"Abbas Khan , Camille Douard , Antonella Iadecola , Thierry Brousse , Olivier Crosnier","doi":"10.1016/j.electacta.2025.147435","DOIUrl":"10.1016/j.electacta.2025.147435","url":null,"abstract":"<div><div>In AgNbO<sub>3</sub> perovskite structure, electrochemical activation is speculated during the first lithiation cycle enabling the material to reversibly store Li<sup>+</sup> by the contributions of both Ag and Nb cation. However, the origin of electrochemically induced structural activation and understanding of cations involvement in complex Li<sup>+</sup> storage mechanism is still elusive. Herein, <em>operando</em> synchrotron X-ray absorption spectroscopy (XAS) was applied to clarify this mechanism under different cycling conditions. Ag K-edge XAS measurements during first lithiation revealed a gradual Ag<sup>+</sup> to Ag<sup>0</sup> reduction starting at a relatively high potential of 1.0 V <em>vs</em> Li<sup>+</sup>/Li, thus creating vacancies in the lattice for Li<sup>+</sup> insertion and inducing a crystalline-to-amorphous structural transition. Below 0.3 V <em>vs</em> Li<sup>+</sup>/Li, metallic Ag forms multiple intermetallic Li-Ag alloys, resulting in lithium-rich Li<sub>9</sub>Ag at the end of lithiation. Simultaneously, Nb K-edge XAS measurements indicate an irreversible Nb<sup>5+</sup> to Nb<sup>3+</sup> reduction with formation of metastable phases during first lithiation. Upon extended cycling at high current densities, intermediate phases sustain reversible Li<sup>+</sup> storage through Nb-redox activity and Li-Ag (de)alloying reactions, facilitating fast charging capability. This study will help in designing new conversion-alloying type negative electrodes for fast-charging batteries.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147435"},"PeriodicalIF":5.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134284","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}