Enhancement of oxygen reduction reaction activity by grain boundaries in platinum nanostructures

作     者：Enbo Zhu Wang Xue Shiyi Wang Xucheng Yan Jingxuan Zhou Yang Liu Jin Cai Ershuai Liu Qingying Jia Xiangfeng Duan Yujing Li Hendrik Heinz Yu Huang Enbo Zhu;Wang Xue;Shiyi Wang;Xucheng Yan;Jingxuan Zhou;Yang Liu;Jin Cai;Ershuai Liu;Qingying Jia;Xiangfeng Duan;Yujing Li;Hendrik Heinz;Yu Huang

作者机构：Department of Materials Science and EngineeringUniversity of CaliforniaLos AngelesCA90095USA School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081China Department of Chemistry and BiochemistryUniversity of CaliforniaLos AngelesCA90095USA Department of Chemical and Biological EngineeringUniversity of Colorado BoulderBoulderCO80309USA Department of Chemistry and Chemical BiologyNortheastern UniversityBostonMA02115USA California NanoSystems InstituteUniversity of CaliforniaLos AngelesCA90095USA 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2020年第13卷第12期

页      面：3310-3314页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：E.Z.and Y.H.acknowledge the Electron Imaging Center of Nanomachines at University of California,Los Angeles for TEM support.Y.H.acknowledges support from the Office of Naval Research under grant number N000141812491 National Science Foundation DMREF 1437263.S.W.and H.H.acknowledge support by the National Science Foundation(DMREF 1623947,CBET 1530790,OAC 1931587,and CMMI 1940335) The allocation of computational resources is acknowledged at the Argonne Leadership Computing Facility,which is a DOE Office of Science User Facility supported under contract DE-AC02-06CH11357,and at the Summit supercomputer supported by the National Science Foundation(ACI-1532235 and ACI-1532236) The authors declare no competing financial interests.Use of beamline ISS 8-ID of the National Synchrotron Light Source(NSLS)II was supported by the NSLS-II,Brookhaven National Laboratory,under U.S.DOE Contract No.DE-SC0012704 

主　　题：oxygen reduction reaction nanowire peptide grain boundaries 

摘      要：Systematic control of grain boundary densities in various platinum(Pt)nanostructures was achieved by specific peptide-assisted assembly and coagulation of nanocrystals.A positive quadratic correlation was observed between the oxygen reduction reaction(ORR)specific activities of the Pt nanostructures and the grain boundary densities on their *** to commercial Pt/C,the grain-boundary-rich strain-free Pt ultrathin nanoplates demonstrated a 15.5 times higher specific activity and a 13.7 times higher mass *** studies suggested that the specific activity of ORR was proportional to the resident number and the resident time of oxygen on the catalyst surface,both of which correlate positively with grain boundary density,leading to improved ORR activities.