物理化学学报2023，Vol.39Issue(9)：119-128,10.DOI:10.3866/PKU.WHXB202212025
微波热冲快速制备二维多孔La0.2Sr0.8CoO3钙钛矿用于高效电催化析氧反应
Microwave Shock Process for Rapid Synthesis of 2D Porous La0.2Sr0.8CoO3 Perovskite as an Efficient Oxygen Evolution Reaction Catalyst
摘要
Abstract
The oxygen evolution reaction(OER)is considered the rate-limiting step in electrochemical water splitting,and has been widely used to solve energy and environmental issues.Perovskite oxides(ABO3)exhibit good OER activity,owing to their tunable electronic structures and highly flexible elemental compositions.However,the preparation of perovskite oxides usually requires long exposure to high temperatures,resulting in metal agglomeration and undesirable effects on intrinsic activity.Vapor-phase microwave technology can significantly reduce the duration of heat treatment and subsequently reduce the associated carbon emissions.This technology not only addresses the growing demand for carbon-neutral processes but also enables increased control of the synthesis to avoid undesirable agglomeration of the product.In this study,a 2D porous La0.2Sr0.8CoO3 perovskite was rapidly prepared using a microwave shock method.The rapid entropy increase associated with the microwave process can effectively expose abundant active sites in the La0.2Sr0.8CoO3 structure.Furthermore,the high-energy microwave shock process can precisely introduce Sr2+into the lattice of LaCoO3,increasing the number of oxygen vacancies by increasing the oxidation state of Co.The oxygen vacancies introduced by replacing La with Sr can considerably improve the intrinsic catalytic activity of the material.For the OER in alkaline electrolytes,the prepared La0.2Sr0.8CoO3 catalyst displayed an excellent overpotential of 360 mV at 10 mA.cm-2 and a Tafel slope of 76.6 mV·dec-1.After a long-term cycle test of 30000 s,97％of the initial current density was maintained.This study presents a facile and rapid strategy for the synthesis of highly active 2D perovskites.关键词
二维/钙钛矿/微波/氧缺陷/析氧反应Key words
Two-dimensional/Perovskite/Microwave/Oxygen vacancy/Oxygen evolution reaction分类
化学引用本文复制引用
胡荣,姜会钰,徐卫林,万骏,姚永刚,韦丽云,鲜靖林,房光钰,吴植傲,樊淼,郭家越,李青翔,刘凯思..微波热冲快速制备二维多孔La0.2Sr0.8CoO3钙钛矿用于高效电催化析氧反应[J].物理化学学报,2023,39(9):119-128,10.基金项目
The project was supported by the National Natural Science Foundation of China(52203070),Open Fund of State Key Laboratory of New Textile Materials and Advanced Processing Technologies,China(FZ2022005),and the Open Fund of Hubei Key Laboratory of Biomass Fiber and Ecological Dyeing and Finishing,China(STRZ202203).国家自然科学基金(52203070),纺织新材料与先进加工技术国家重点实验室开放基金(FZ2022005)及生物质纤维与生态染整理湖北省重点实验室开放基金(STRZ202203)资助 （52203070）
