Room-temperature ligancy engineering of perovskite electrocatalyst for enhanced electrochemical water oxidation  

作　　者：Junchi Wu Yuqiao Guo Haifeng Liu Jiyin Zhao Haodong Zhou Wangsheng Chu Changzheng Wu 

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale,Collaborative Innovation Center of Chemistry far Energy Materials (iChEM),and CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei 230026,China [2]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,China [3]Analytical and Testing Center,Southwest University of Science and Technology,Mianyang 621010,China

出　　处：《Nano Research》2019年第9期2296-2301,共6页纳米研究（英文版）

基　　金：This work was financially supported by the National Key R&D Program of Chnia(No.2017YFA0207301);the National Natural Science Foundation of China(Nos.U1632154,21890751,91745113,11621063,21601172,and J1030412);National Program for Support of Top-notch Young Professionals,the Fundamental Research Funds for the Central Universities(No.WK2090050043);Youth Innovation Promotion Association of CAS(No.2018500);Users with Excellence Project of Hefei Science Center(No.CAS2018HSCUE002).

摘　　要：Perovskite oxides are significant candidates to develop electrochemical catalysts for water oxidation in consideration of their high catalysis capacity,low costing and excellent stability.Rational design of coordination structure and overcoming poor electronic transport are regarded as critical factors for outstanding perovskite-based oxygen evolution reaction (OER) catalysts.Herein,we report a mild chemical oxidation method to realize ligancy engineering from strongly-correlated brownmillerite Sr2Co2O5 to perovskite phase Sr2Co2O5.5,along with abundant oxygen vacancies formation and greatly boosted electric conductivity,which helps to form the active species of Co hydroxide/oxide on the surface of catalysts.The coupling effect of catalytic kinetics and unimpeded electronic movement brings high OER activities in Sr2Co2O5.5 with a low onset potential and a small Tafel slope.Our work not only displays in-depth understanding into the relationship among catalysis performance and multiple physical degrees of freedom,but also paves a new path to develop high-efficient electrochemical catalysts.

关 键 词：PEROVSKITE OXIDES ligancy ENGINEERING oxygen evolution reaction ELECTROCATALYSTS 

分 类 号：O4[理学—物理]