ChemElectroChem最新文献_第2页

Surface-Engineered Pt-Ni(111) Nanocatalysts for Boosting Their ORR Performance via Thermal Treatment 表面工程铂镍（111）纳米催化剂通过热处理提高 ORR 性能

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-29 DOI: 10.1002/celc.202400491

Can Li, Xiaobo Chen, Jinfong Pan, Guangwen Zhou, Jiye Fang

{"title":"Surface-Engineered Pt-Ni(111) Nanocatalysts for Boosting Their ORR Performance via Thermal Treatment","authors":"Can Li, Xiaobo Chen, Jinfong Pan, Guangwen Zhou, Jiye Fang","doi":"10.1002/celc.202400491","DOIUrl":"https://doi.org/10.1002/celc.202400491","url":null,"abstract":"The electrochemical oxygen reduction reaction (ORR) is critical for fuel cell application, and modifying surface structures of electrocatalysts has proven effective in improving their catalytic performances. In this study, we investigated surface-engineered Pt−Ni nano-octahedra subjected to annealing in various atmospheres. All octahedral nanocrystals retained their Pt−Ni {111} facets at an elevated temperature following the annealing treatments. Air annealing led to the formation of nickel-rich shells on the Pt−Ni surface. In contrast, hydrogen (H₂) as a reducing gas facilitated the reduction of surface Ni species, incorporating them into the Pt−Ni bulk alloy, which resulted in superior mass activity and specific activity for ORR-approximately 2.4 and 2.3 times as high as those from the unmodified counterpart, respectively. After 20,000 potential cycles, the H₂/Ar-annealed Pt−Ni nano-octahedra maintained a mass activity of 3.92 A/<math></math>\u0000, surpassing the initial mass activity of the unannealed counterparts (2.95 A/<math></math>\u0000). These findings demonstrate a viable approach for tailoring catalyst surfaces to enhance performance in various energy storage and conversion applications.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 22","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400491","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142674108","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}

引用次数: 0

A Uniform Conductive Carbon Coating of Nitrogen-Doped Carbon Improves the Electrochemical Performance of LiMn0.7Fe0.3PO4 Cathode Material for Lithium-ion Batteries 均匀的掺氮导电碳涂层提高了锂离子电池用 LiMn0.7Fe0.3PO4 阴极材料的电化学性能

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-21 DOI: 10.1002/celc.202400440

Hesen Xiong, Zongliang Zhang, Jiaxin Dai, Pei Zhao, Kai He, Jie Gao, Dr. Qiang Wu, Dr. Baofeng Wang

{"title":"A Uniform Conductive Carbon Coating of Nitrogen-Doped Carbon Improves the Electrochemical Performance of LiMn0.7Fe0.3PO4 Cathode Material for Lithium-ion Batteries","authors":"Hesen Xiong, Zongliang Zhang, Jiaxin Dai, Pei Zhao, Kai He, Jie Gao, Dr. Qiang Wu, Dr. Baofeng Wang","doi":"10.1002/celc.202400440","DOIUrl":"https://doi.org/10.1002/celc.202400440","url":null,"abstract":"The practical application of LiMn1−xFexPO4 as a cathode material is hindered considerably by its poor electronic conductivity and slow lithium-ion diffusion. In the present study, a uniform nitrogen-doped carbon coating on LiMn0.7Fe0.3PO4 (LiMn0.7Fe0.3PO4@NC) was achieved using ethylene diamine tetraacetic acid (EDTA) as a chelating agent and carbon source. The nitrogen-doped carbon layer enhanced the electronic conductivity and ionic diffusion of the LiMn0.7Fe0.3PO4 cathode. Furthermore, the uniform carbon layer prevented metal ion dissolution and stabilized the crystal structure. The resulting LiMn0.7Fe0.3PO4@NC-2 sample demonstrated superior performance with a specific capacity of 152.5 mAh g−1 at 0.1 C and preserved 93.7 % of this capacity over 200 cycles at 1 C. Meanwhile, the LiMn0.7Fe0.3PO4@NC-2 sample demonstrated a high Li+ diffusion coefficient (3.98×10−11 cm2 s−1) and electrical conductivity (1.47×10−2 S cm−1). This study presents a novel approach to designing high-performance cathode materials using a cost-effective and straightforward process.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 21","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400440","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666109","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}

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Elucidating the Performance Limitations of a 25 cm2 Pure-Water-Fed Non-Precious Metal Anion Exchange Membrane Electrolyzer Cell 阐明 25 平方厘米纯水非贵金属阴离子交换膜电解槽的性能限制

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-21 DOI: 10.1002/celc.202400334

Michelle Sophie Lemcke, Dr. Stefan Loos, Dr. Nadine Menzel, Prof. Dr. Michael Bron

{"title":"Elucidating the Performance Limitations of a 25 cm2 Pure-Water-Fed Non-Precious Metal Anion Exchange Membrane Electrolyzer Cell","authors":"Michelle Sophie Lemcke, Dr. Stefan Loos, Dr. Nadine Menzel, Prof. Dr. Michael Bron","doi":"10.1002/celc.202400334","DOIUrl":"https://doi.org/10.1002/celc.202400334","url":null,"abstract":"Anion exchange membrane (AEM) water electrolysis has emerged as a promising technology for producing hydrogen in a carbon-neutral economy. To advance its industrial application, performance evaluations of non-precious metal AEM electrolyzers with electrode areas of 25 cm2 were conducted. The focus was on pure water operation, achieving a current density of 0.26 A cm−2 at a voltage of 2.2 V. To gain a better understanding, the AEM electrolyzer was also operated in aqueous KOH, yielding 1.2 A cm−2 at 2.2 V. By adding a liquid electrolyte and by varying cell components, causes of the occurring performance limitations and ways to improve the AEM electrolyzer were identified. Electrochemical impedance analysis showed that the activation loss at the anode due to sluggish OER kinetics was the limiting factor at low current densities. At higher current densities, which is the operating range of interest for industrial application, the ohmic resistance from the membrane was the dominant factor limiting high performance in pure water operation.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 21","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400334","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666108","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}

引用次数: 0

Electrohydrogenation of Unsaturated Bonds Catalyzed by Earth-Abundant Metal Complexes 富含地球的金属络合物催化的不饱和键电加氢反应

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-21 DOI: 10.1002/celc.202400462

Ying Hua, Huihua Bi, Jie Liu

引用次数: 0

Photoelectrochemical Hydrogen Production from Water Using Copper-based Chalcopyrite Thin Films 利用铜基黄铜矿薄膜光电化学法从水中制氢

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-21 DOI: 10.1002/celc.202400365

Shigeru Ikeda, Shogo Ishizuka

{"title":"Photoelectrochemical Hydrogen Production from Water Using Copper-based Chalcopyrite Thin Films","authors":"Shigeru Ikeda, Shogo Ishizuka","doi":"10.1002/celc.202400365","DOIUrl":"https://doi.org/10.1002/celc.202400365","url":null,"abstract":"Copper (Cu)-based chalcopyrite compounds are promising photoabsorber materials not only for solar cells but also for photoelectrochemical (PEC) systems for conversion of sunlight energy into chemical energy. PEC water splitting to generate hydrogen (H2) is one of the most advanced technologies in a PEC system for the use of Cu-based chalcopyrite compounds. In this review, we firstly introduce crystallographic/energetic structures of Cu-based chalcopyrite compounds in view of their applications to PEC water splitting. Explanations for the operation of PEC water splitting using semiconductor materials are then overviewed. Based on these backgrounds, studies on PEC H2 evolution over photocathodes based on CuInS2 and CuGaSe2 thin films that we have developed are reviewed in detail. For realizing efficient PEC H2 evolution over these thin films, surface modifications with an n-type layer such as CdS and a catalytic site such as Pt deposit were found to be indispensable. Precise controls of p-n heterointerfaces formed by introducing an n-type layer should also be required to enhance PEC performance. Although PEC water splitting has not reached the required efficiency to be useful, effective combinations of appropriate surface and interface modifications should lead to further improvements of properties to be close to practical applications.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 21","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400365","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666105","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}

引用次数: 0

Professor Flavio Maran 弗拉维奥-马兰教授

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-21 DOI: 10.1002/celc.202400507

引用次数: 0

Open-ESyn: A 3D-Printed Toolkit for Expanded ElectraSyn Functionality and Reproducibility for Electrosynthesis Open-ESyn：用于扩展电合成功能和再现性的三维打印工具包

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-21 DOI: 10.1002/celc.202400454

Anthony Choi, David M. Heard, Calum S. Haydon, Alastair J. J. Lennox

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Lithium Demand and Cyclability Trade-Off in Conductive Nanostructure Scaffolds in Terms of Different Tortuosity Parameters 不同曲率参数下导电纳米结构支架的锂需求与循环能力权衡

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-21 DOI: 10.1002/celc.202400428

Seyed Ali Hoseini, Shams Mohajerzadeh, Zeinab Sanaee

{"title":"Lithium Demand and Cyclability Trade-Off in Conductive Nanostructure Scaffolds in Terms of Different Tortuosity Parameters","authors":"Seyed Ali Hoseini, Shams Mohajerzadeh, Zeinab Sanaee","doi":"10.1002/celc.202400428","DOIUrl":"https://doi.org/10.1002/celc.202400428","url":null,"abstract":"Through alteration of the polarity of DC plasma during the growth of carbon nanotubes in a PECVD reactor, significantly different morphologies of such species have been achieved. By using this approach, for the first time, both Half-aligned and Entangled structures were synthesized, along with Full-aligned carbon nanotubes, introducing three binder-free electrodes with various levels of tortuosity. The crucial parameter and influential effect of tortuosity in these three-dimensional nanostructure scaffolds for application in lithium-ion batteries were investigated. Previous research findings suggested that increasing the tortuosity of the conductive scaffolds leads to preferential accumulation of lithium at the top surface and causes the loss of capacity in subsequent charge-discharge cycles. Our finding reveals that there exists a trade-off between lithium-demand, capacity, and preferential accumulation of lithium at the top surface. Among the presented scaffolds, the Half-aligned MWCNTs was able to maintain a high capacity of 876.9 mAh/g over more than 300 cycles, and demonstrate capacity improvement during this period and excellent rate capability, even at a rate of 5 C. This capacity is almost three times that can be achieved with graphite, showcasing promising and outstanding results for carbon nanotubes.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 21","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400428","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666066","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}

引用次数: 0

Microenvironment Manipulation Strategies for Acidic CO2 Electrolysis 酸性二氧化碳电解的微环境控制策略

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-17 DOI: 10.1002/celc.202400475

Geng Li, Yong Liu, Tanglue Feng, Ruquan Ye

{"title":"Microenvironment Manipulation Strategies for Acidic CO2 Electrolysis","authors":"Geng Li, Yong Liu, Tanglue Feng, Ruquan Ye","doi":"10.1002/celc.202400475","DOIUrl":"https://doi.org/10.1002/celc.202400475","url":null,"abstract":"The electrochemical reduction of CO2 (CO2RR) has gained significant attention due to its potential to reduce carbon emissions and produce valuable fuels and chemicals. CO2RR is typically carried out in neutral or alkaline conditions, while challenges such as the carbon crossover and salt precipitate can hinder the practical application. Conducting CO2RR in acidic media presents a promising method to address these issues, although it faces the problem of low efficiency and poor catalysis stability. Regulating the interface/surface microenvironment near the catalysts is crucial to minimize the competitive hydrogen evolution reaction and enhance CO2RR activity and long-term stability. This review outlines recent advancements in acidic CO2RR, emphasizing various microenvironment engineering strategies for optimizing the CO2RR kinetics including electrolyte composition manipulation, catalyst design, electrode modification and cell configuration optimization. Additionally, the review addresses challenges into developing practical and cost-effective CO2RR systems.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 21","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400475","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665977","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}

引用次数: 0

Composite Separators with Very High Garnet Content for Solid-State Batteries 用于固态电池的石榴石含量极高的复合分离器

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-10-17 DOI: 10.1002/celc.202400323

Kevin Vattappara, Dr. Martin Finsterbusch, Prof. Dr. Dina Fattakhova-Rohlfing, Dr. Andriy Kvasha

{"title":"Composite Separators with Very High Garnet Content for Solid-State Batteries","authors":"Kevin Vattappara, Dr. Martin Finsterbusch, Prof. Dr. Dina Fattakhova-Rohlfing, Dr. Andriy Kvasha","doi":"10.1002/celc.202400323","DOIUrl":"https://doi.org/10.1002/celc.202400323","url":null,"abstract":"Lithium-metal solid-state batteries are attractive as next generation of Li-ion batteries due to higher safety and potentially higher energy density. To improve processability, solid-composite separators combine advantages of inorganic and polymer separators in hybrid structure. We report a systematic approach to fabricate composite separators with high content (90–95 wt %) of ceramic Li-ion conducting Li6.45Al0.05La3Zr1.6Ta0.4O12 (LLZO) powder embedded in a polyethylene oxide (PEO)-LiTFSI (20 : 1) matrix and understand factors affecting their properties and performance. Separators with good mechanical flexibility and excellent thermal stability were obtained, by optimizing materials and processing parameters. It was found that PEO molecular weight strongly influences the microstructure and electrochemical properties of the separators. In optimized separator with 90 wt % of LLZO and PEO with Mw 300,000 g/mol, a total ionic conductivity of 1.4×10−5 S/cm at 60 °C was achieved. The ceramic-rich separator showed excellent long-term cycling stability for more than 460 cycles (1000 h) at 0.1 mA/cm2 in Li/Li symmetrical cells and achieved a critical current density of 0.25 mA/cm2. The separators also enabled initial discharge capacities of more than 160 mAh/g in full cells with Li metal anode and composite solid-state LiNi0.6Co0.2Mn0.2O2 cathode, although rapid capacity fade was observed after 10 cycles in fully solid-state configuration.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 21","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400323","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666034","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}

引用次数: 0