Oxygen-Reconstituted Active Species of Single-Atom Cu Catalysts for Oxygen Reduction Reaction  

作　　者：Liu Yang Haoxiang Xu Huibing Liu Xiaofei Zeng Daojian Cheng Yan Huang Lirong Zheng Rui Cao Dapeng Cao 

机构地区：[1]Beijing Advanced Innovation Center for Soft Matter Science and Engineering,State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China [2]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]Stanford Synchrotron Radiation Lightsource,SLAC National Accelerator Laboratory,Menlo Park,California 94025,USA

出　　处：《Research》2020年第1期1330-1341,共12页研究（英文）

基　　金：This work is supported by the National Key Research and Development Project from MOST(2019YFA0210300);Outstanding Talent Fund from Beijing University of Chemical Technology.

摘　　要：Identification of an active center of catalysts under realistic working conditions of oxygen reduction reaction(ORR)still remains a great challenge and unclear.Herein,we synthesize the Cu single atom embedded on nitrogen-doped graphene-like matrix electrocatalyst(abbreviated as SA-Cu/NG).The results show that SA-Cu/NG possesses a higher ORR capability than 20%Pt/C at alkaline solution while the inferior activity to 20%Pt/C at acidic medium.Based on the experiment and simulation calculation,we identify the atomic structure of Cu-N_(2)C_(2) in SA-Cu/NG and for the first time unravels that the oxygenreconstituted Cu-N_(2)C_(2)-O structure is really the active species of alkaline ORR,while the oxygen reconstitution does not happen at acidic medium.The finding of oxygen-reconstituted active species of SA-Cu/NG at alkaline media successfully unveils the bottleneck puzzle of why the performance of ORR catalysts at alkaline solution is better than that at acidic media,which provides new physical insight into the development of new ORR catalysts.

关 键 词：ALKALINE OXYGEN abbreviated 

分 类 号：O64[理学—物理化学]