Oxygen vacancies engineering by coordinating oxygen-buffering CeO_(2) with CoO_(x) nanorods as efficient bifunctional oxygen electrode electrocatalyst  

作　　者：Haihong Zhong Luis Alberto Estudillo-Wong Yuan Gao Yongjun Feng Nicolas Alonso-Vante 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing Engineering Center for Hierarchical Catalysts,College of Chemistry,Beijing University of Chemical Technology,No.15 Beisanhuan East Road,100029 Beijing,China [2]IC2MP,UMR-CNRS 7285,University of Poitiers,F-86022 Poitiers Cedex,France [3]Departamento de Sociedad y Política Ambiental,CIIEMAD,Instituto Politécnico Nacional,Calle 30 de junio de 1520,Alcaldía GAM,C.P.07340 CDMX,Mexico [4]Anqing Research Institute,Beijing University of Chemical Technology,No.8 Huanhu West Road,High-Tech District,Anqing 24600,China

出　　处：《Journal of Energy Chemistry》2021年第8期615-625,I0013,共12页能源化学（英文版）

基　　金：supported by the National Key R&D Program of China(No.2016YFB0301600);the National Natural Science Foundation of China,the Fundamental Research Funds for the Central Universities(JD1716,12060093063);the Programme XU Guangqi(Code Projet:45644RC);the financial support from the China Scholarship Council。

摘　　要：CeO_(2)decorated CoOx rod-like hybrid,supported onto holey reduced graphene(CoOx/CeO_(2)/RGO)composite,was fabricated via a surfactant-assisted route.Its corresponding electrocatalytic performance towards oxygen reduction/evolution reactions(ORR and OER)was systematically investigated in alkaline electrolyte.Structural,morphological and compositional studies revealed changes in electronic and surface properties when CeO_(2)was introduced as an oxygen buffer material.The oxygen vacancies effectively enhanced the electrocatalytic activity,while the synergistic effect of co-catalyst CeO_(2),CoOx activecenters,and defective graphene with many voids facilitate the charge/mass transfer,making CoOx/CeO_(2)/RGO an efficient and stable bifunctional electrocatalyst for OER/ORR with△E=0.76 V(△E=E10mAcm.-2OER-E_(1/2).ORR).This parameter is 70 mV and 270 mV lower than CoOx/RGO and the benchmark Pt/C,respectively.In addition,the OER/ORR bifunctionality of CoOx/CeO_(2)/RGO composite outperforms that of Pt/C catalyst in a H2-O_(2)micro fuel cell platform.

关 键 词：CO3O4 CeO_(2) Oxygen vacancies ORR OER 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学]