Jin Guo, Lixuan Wang, Lihong Song, Xiaoyan Yan, Shijian Yan, Zhanlong Li, Huaying Li, Wei Kong Pang
{"title":"Synthesis of Bi2Se3 Nanosheets on COF Surfaces as Cathode for Lithium-Sulfur Batteries: Synergistic Mechanism of Anchoring and Catalyzing Polysulfides","authors":"Jin Guo, Lixuan Wang, Lihong Song, Xiaoyan Yan, Shijian Yan, Zhanlong Li, Huaying Li, Wei Kong Pang","doi":"10.1002/celc.70321","DOIUrl":"https://doi.org/10.1002/celc.70321","url":null,"abstract":"<p>Lithium-sulfur (Li-S) batteries are one of the popular choices for the high energy storage systems due to their high theoretical energy density, cheap raw materials, and environmental friendliness. This work adopts a hydrothermal method to prepare covalent organic frameworks (COFs). Bi<sub>2</sub>Se<sub>3</sub> nanosheets are synthesized on COFs to obtain Bi<sub>2</sub>Se<sub>3</sub>/COFs composites serving as sulfur hosts. The porous COFs accommodate active sulfur and restrain the diffusion and migration of lithium polysulfides simultaneously. Furthermore, polar Bi<sub>2</sub>Se<sub>3</sub> immobilizes lithium polysulfides via chemical adsorption and efficiently alleviates the shuttle effect. Its layered nanostructure not only improves the structural stability of the cathode, but also endows the composites with superior electrical conductivity to accelerate the the redox reaction of sulfur. The results illustrate that the S/Bi<sub>2</sub>Se<sub>3</sub>/COFs electrode shows a remarkable initial discharge specific capacity of 961.2 mAh g<sup>−1</sup> at 0.5 C. After 700 cycles, the capacity decay rate is 0.047% per cycle, showing excellent cycle stability. Therefore, the Bi<sub>2</sub>Se<sub>3</sub>/COFs are a desirable sulfur-loading host for high-performance Li-S batteries.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 21","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70321","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149177391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparison of Different Electrochemical Setups for Noninvasive Impedance Measurements on Archeological Coins","authors":"Enrico Verlato, Marco Musiani","doi":"10.1002/celc.70318","DOIUrl":"https://doi.org/10.1002/celc.70318","url":null,"abstract":"<p>The electrochemical characterization of cultural heritage objects requires noninvasive approaches. In the case of patina-covered bronze objects, two essential features of the setups recently proposed to satisfy this requirement are (i) the use of gel electrolytes and (ii) the absence of metal contacts that might damage the patina (or, at least, the control of the size of the damaged area to make it invisible to the naked eye). In the present work we show how the impedance of model coins is most conveniently measured using a four-electrode setup where the sample is mounted in a symmetrical two-compartment cell filled with a gel electrolyte which contacts both coin faces. Results are presented for model coins with polished surfaces, patina-covered coins, coins pretreated with a corrosion inhibitor (benzotriazole), and coins coated with a commercial acrylate/methacrylate copolymer (Paraloid B-72<sup>(R)</sup>). Compared with alternative approaches involving two-electrode or three-electrode setups, our approach is the only one which simultaneously warrants a noninvasive character and the direct determination of the sample impedance without needing any correction. Although only model coins were used in this study, the above conclusion applies as well to true archaeological coins.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 20","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70318","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jungmyung Kim, Joseph B. Russell, Shaan Bibi Jaffri, Edward Brightman, Stuart D. Robertson, Jaewoo Seo, Dowon Bae
{"title":"Bromine Retention Versus Electrochemical Accessibility in a Ferri-/Ferrocyanide–Bromine Flow Battery","authors":"Jungmyung Kim, Joseph B. Russell, Shaan Bibi Jaffri, Edward Brightman, Stuart D. Robertson, Jaewoo Seo, Dowon Bae","doi":"10.1002/celc.70319","DOIUrl":"https://doi.org/10.1002/celc.70319","url":null,"abstract":"<p>Bromine retention in aqueous redox flow batteries can be improved by complexation, but the resulting gain in stability is often accompanied by losses in electrochemical accessibility and transport. Here, we investigate a ferri-/ferrocyanide–bromine flow battery based on soluble ferri-/ferrocyanide and bromine/bromide redox electrolytes. Three bromine/bromide positive-electrolyte conditions were compared: a pristine bromide electrolyte, an electrolyte containing the bromine-complexing agent (BCA) <i>N</i>-ethyl-<i>N</i>-methylpyrrolidinium bromide ([EMPyrr]Br), and the same electrolyte after nitrogen presparging. Charge–capacity retention after 70 cycles increased from 23.4% for the pristine electrolyte to 34.9% with [EMPyrr]Br and 66.0% with [EMPyrr]Br and nitrogen presparging. Because neither a nitrogen-pre-sparged BCA-free control nor an alternative inert-gas control was examined, the higher retention cannot be attributed uniquely to nitrogen; deaeration and sparging-induced redistribution of bromine-rich phases may also contribute. Improved retention was accompanied by increased polarization, higher ex situ electrolyte impedance, and an initial voltage rise associated with bromine-rich phase formation. Postcycling cyclic voltammetry provides qualitative evidence of bromine crossover, while Raman spectroscopy shows condition-dependent bromine-related signatures in the sampled liquid phase. These findings show that improved charge–capacity retention does not necessarily translate into better cell performance unless the retained bromine remains electrochemically accessible.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 20","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70319","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Parker Evans, Vishnu B. Sundaresan, Katrina Cornish
{"title":"Finite Element Analysis of Programmable Chemical Actuators","authors":"J. Parker Evans, Vishnu B. Sundaresan, Katrina Cornish","doi":"10.1002/celc.70322","DOIUrl":"https://doi.org/10.1002/celc.70322","url":null,"abstract":"<p>Spatiotemporal modulation of electrochemical gradients to control enzyme activity in biological systems has been achieved using programmable chemical actuators (PCAs). The electronic-ionic coupling by polypyrrole is the operational physics foundation of PCAs. In a previous study, pH-indicating dyes were used to measure the effects of potential application techniques on the temporal control over the gradient. Also, when PCAs were operated under duplex pulse amperometry, the duty cycle was studied as a control variable over soluble alkaline phosphatase activity. The data were used here to develop numerical models of the ion transport mechanisms in three PCAs differing in size and geometry based on finite element analysis. The models considered electric fields, ion flux, diffusion, and Coulombic repulsion and were implemented and solved with COMSOL Multiphysics using the Secondary Current Distribution and Transport of Diluted Species predefined application modes. The new models were able to accurately predict ion transport patterns induced by PCAs in a 6-well plate and a 10 mL beaker but were less accurate for a PCA in a semi-microcuvette, probably due to the dependence of current density on the surface roughness of the working electrode. Nonetheless, these models provide a good foundation to design PCAs for new applications.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 20","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70322","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kawthar Shaheen, Kangkang Ge, Pierre-Louis Taberna, Patrice Simon
{"title":"Molten Salt-Derived Double Transition Metal MXene (Ti2NbC2Tx) as a Capacitive Material for Energy Storage Applications","authors":"Kawthar Shaheen, Kangkang Ge, Pierre-Louis Taberna, Patrice Simon","doi":"10.1002/celc.70259","DOIUrl":"https://doi.org/10.1002/celc.70259","url":null,"abstract":"<p>MXene, a class of two-dimensional material have attracted wide attention as an energy storage material. In this work, a double transition metal MXene Ti<sub>2</sub>NbC<sub>2</sub>T<sub><i>x</i></sub> was prepared via molten salt (MS) etching with controlled –Cl and –O terminations. The results demonstrate that the introduction of O-terminated MXene enhances electrochemical performance, resulting in a high Li<sup>+</sup> storage capacity up to 320 mAh/g and high rate capability 220 mAh/g at 1C rate. These findings highlight double transition metal MXene prepared by MS etching as a promising negative electrode material for energy storage in a nonaqueous electrolyte.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 20","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70259","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Rational Engineering of Cellobiose Dehydrogenase via Substrate Pocket Redesign and Electron Transfer Optimization for Efficient Bioelectrosynthesis of Lactobionic Acid","authors":"Xinyu Cui, Haiyan Song, Yuanming Wang, Zepeng Kang, Hao Su, Lingling Zhang, Zhiguang Zhu","doi":"10.1002/celc.70296","DOIUrl":"https://doi.org/10.1002/celc.70296","url":null,"abstract":"<p>Cellobiose dehydrogenase (CDH) is a fungal extracellular flavocytochrome crucial for biomass degradation and promising for bioelectrocatalytic applications. However, its practical application remains limited by suboptimal catalytic efficiency and inefficient electron transfer. Here, an integrated engineering strategy was developed that couples substrate-pocket modification with electron-transfer optimization to enhance overall catalytic cycle simultaneously. Structure-guided engineering identified beneficial substrate-pocket mutations, which were subsequently combined with the previously validated electron-transfer-enhancing mutations (W316H and A165C), yielding the triple mutant A165C-N313D-W316H. This variant exhibited a fourfold increase in catalytic specific activity and an 8.5-fold enhancement in electron transfer rate relative to the WT. Molecular dynamics simulations further revealed that the mutation improves the hydrogen-bonding network within the substrate-binding pocket. Moreover, the mutant retained high thermostability, displayed enhanced specificity toward lactose, and reduced hydrogen peroxide generation by 82% compared with the WT. When immobilized on electrodes, A165C-N313D-W316H showed substantially improved electrocatalytic performance. Under optimized conditions, the MET-based bioelectrocatalytic system achieved a 94% conversion yield of lactobionic acid within 18 h. This study demonstrates that the integration of substrate-pocket and electron-transfer engineering effectively improves the overall catalytic cycle of CDH and provides a promising approach for engineering multidomain redox enzymes.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 20","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70296","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Wireless Electrochemical Palladium Membrane Reactor","authors":"Hossein Bemana, Jost Heise, Shuai Yan, Hariprasad Ranganathan, Abolfazl Kiani, Nikolay Kornienko","doi":"10.1002/celc.70324","DOIUrl":"https://doi.org/10.1002/celc.70324","url":null,"abstract":"<p>Electrochemical palladium membrane reactors traditionally rely on direct cathodic polarization of the palladium membrane to drive hydrogen permeation. This work introduces the wireless electrochemical palladium membrane reactor (wPMR), a design that utilizes bipolar electrochemistry to actuate hydrogen transport without direct electrical connections to the membrane. By redefining the palladium membrane as an “ajar” bipolar electrode, we demonstrate that it functions similarly to a diode, requiring a voltage threshold to initiate selective hydrogen transport along an induced external electric field. As a proof-of-concept, we integrated the wPMR with lithium-mediated nitrogen reduction, successfully synthesizing ammonia using hydrogen atoms derived directly from water. Unlike conventional systems that suffer from structural deformation due to lattice expansion, the wPMR maintains membrane integrity by avoiding the lattice-expanded β-PdH. Through isotope labeling and <i>operando</i> monitoring, we confirm the synchronous operation of four Faradaic reactions within this reaction geometry. The wPMR thus emerges as a high-voltage electrosynthetic platform capable of directly delivering hydrogen from water to organic reactions.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 20","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70324","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liu Xing, Feng Ailing, Peng Yue, Guo Yating, Liu Yuhui, Li Lanfen, Zu Yanqing, Liu Peitao, Li Xiaodong
{"title":"Performance Optimization and Prospects of Double Network Hydrogels for Flexible Electronic Devices","authors":"Liu Xing, Feng Ailing, Peng Yue, Guo Yating, Liu Yuhui, Li Lanfen, Zu Yanqing, Liu Peitao, Li Xiaodong","doi":"10.1002/celc.70270","DOIUrl":"https://doi.org/10.1002/celc.70270","url":null,"abstract":"<p>Dual-network (DN) hydrogels possess tunable polymer network architectures, exceptional mechanical robustness, and superior water retention capability. They demonstrate substantial potential in structural optimization and performance stabilization, thus garnering widespread attention from both the academic and industrial sectors in the field of flexible devices such as supercapacitors, temperature sensors, and zinc-air batteries. Focusing on the gelation mechanisms of DN hydrogels, this review systematically classifies them into three categories according to different cross-linking interactions, namely Chemical crosslinking, physical crosslinking, and hybrid crosslinking. Notably, this review details optimization strategies for the electrical conductivity, temperature resistance, and mechanical properties of DN hydrogels, including porosity enhancement, conductive filler incorporation, the salt-in-water strategy, and network structure modulation. Finally, it elaborates on the applications of DN hydrogels in flexible devices (supercapacitors, temperature sensors, zinc-air batteries). Based on the aforementioned findings, an innovative and feasible strategic outlook is put forward, with the aim of facilitating the further advancement of these flexible devices.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 20","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70270","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Practical Guide to First-Principles Calculations for Pseudocapacitive Materials: From Electrochemical Experiments to Atomistic Understanding","authors":"Kenji Oqmhula, Ryo Maezono, Kenta Hongo","doi":"10.1002/celc.70306","DOIUrl":"https://doi.org/10.1002/celc.70306","url":null,"abstract":"<p>We review recent computational advances in understanding the energy storage mechanisms of pseudocapacitive electrode materials, with particular emphasis on first-principles approaches, including density functional theory (DFT), joint density functional theory (JDFT), and computational electrochemistry at electrode/electrolyte interfaces. Representative classes of pseudocapacitive materials are systematically discussed together with the theoretical foundations, practical methodologies, and representative applications of first-principles calculations. Particular attention is devoted to quantitative descriptions of the competition between electric double-layer formation and Faradaic redox reactions, which governs pseudocapacitive charge storage under realistic electrochemical conditions. This review also summarizes practical considerations for computational modeling, software selection, and interpretation of computational results, providing a practical guide for researchers working at the interface between computational and experimental electrochemistry. Finally, recent developments in computational electrochemistry, together with emerging methodologies that extend first-principles calculations, including machine-learning potential, computational electrochemistry, and emerging electrochemoinformatics, are highlighted, along with their future prospects for predictive materials design.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 20","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70306","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149068600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aknachew Mebreku Demeku, Hsin-Te Lin, Zih-Jhong Huang, Daniel Manaye Kabtamu, Hailegnaw Gizaw Workie, Johan Nabiel Raihan, Anteneh Wodaje Bayeh, Sheau-Pyng Ju, Chen-Hao Wang
{"title":"Oxygen-Vacancy-Engineered CoSnO3/rGO Nanocubes as High-Performance Cathode Electrocatalysts for Advanced Vanadium Redox Flow Batteries","authors":"Aknachew Mebreku Demeku, Hsin-Te Lin, Zih-Jhong Huang, Daniel Manaye Kabtamu, Hailegnaw Gizaw Workie, Johan Nabiel Raihan, Anteneh Wodaje Bayeh, Sheau-Pyng Ju, Chen-Hao Wang","doi":"10.1002/celc.70314","DOIUrl":"https://doi.org/10.1002/celc.70314","url":null,"abstract":"<p>Oxygen vacancy-engineered CoSnO<sub>3</sub>/reduced graphene oxide (CoSnO<sub>3</sub>/rGO) serves as a durable cathode electrocatalyst for vanadium redox flow batteries (VRFBs). Structural and spectroscopic analyses confirm the formation of defect-rich amorphous CoSnO<sub>3</sub> uniformly integrated with a conductive rGO network, which exhibits a high fraction (22.54%) of oxygen vacancy-related defect oxygen species as indicated by combined X-ray photoelectron spectroscopy and electron paramagnetic resonance measurements. These defect sites facilitate VO<sup>2+</sup>/VO<sub>2</sub><sup>+</sup> adsorption and accelerate vanadium redox kinetics. At the same time, the synergistic interaction between CoSnO<sub>3</sub> nanocubes and rGO enhances electron transport, increases active-site exposure, and promotes ion diffusion. When deposited onto heat-treated graphite felt (HGF), the CoSnO<sub>3</sub>/rGO-modified positive electrode exhibits reduced overpotential, improved electrochemical reversibility, and stable high-rate cycling performance in VRFB single cells. The assembled VRFB achieves energy efficiencies of 84.12% at 80 mA cm<sup>−2</sup> and 74.22% at 160 mA cm<sup>−2</sup>, significantly surpassing the efficiencies of pristine graphite felt under identical conditions. These findings show that defect-engineered mixed transition-metal oxide–carbon hybrids are a promising design strategy for high-performance VRFB cathodes and offer insights for developing next-generation large-scale electrochemical energy storage systems.</p>","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"13 19","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.70314","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}