Integrating single Ni site and PtNi alloy on two-dimensional porous carbon nanosheet for efficient catalysis in fuel cell  

作　　者：Fangyao Zhou Yaner Ruan Feng Li Lin Tian Mengzhao Zhu Wenan Tie Xiaoyan Tian Bo Wang Peigen Liu Jie Xu Xiaoping Gao Peng Li Huang Zhou Yuen Wu 

机构地区：[1]Key Laboratory of Precision and Intelligent Chemistry,University of Science and Technology of China,Hefei 230026,China [2]Shanxi Yanchang Petroleum(Group)Co.Ltd.,Xian 710065,China [3]College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,China

出　　处：《Nano Research》2024年第8期6916-6921,共6页纳米研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFA1501003);the National Natural Science Foundation of China(Nos.92261105 and 22221003);the Anhui Provincial Natural Science Foundation(Nos.2108085UD06 and 2208085UD04);the Anhui Provincial Key Research and Development Project(Nos.2023z04020010 and 2022a05020053);the Collaborative Innovation Program of Hefei Science Center,CAS(No.2021HSC-CIP002);the Joint Funds from Hefei National Synchrotron Radiation Laboratory(Nos.KY2060000180 and KY2060000195);the Yanchang foundation(No.KD2203220074).

摘　　要：The performance of catalyst depends on the intrinsic activity of active sites and the structural characteristics of the support.Here,we simultaneously integrate single nickel(Ni)sites and platinum-nickel(PtNi)alloy nanoparticles(NPs)on a two-dimensional(2D)porous carbon nanosheet,demonstrating remarkable catalytic performance in the oxygen reduction reaction(ORR).The single Ni sites can activate the oxygen molecules into key oxygen-containing intermediate that is further efficiently transferred to the adjacent PtNi alloy NPs and rapidly reduced to H_(2)O,which establishes a relay catalysis between active sites.The porous structure on the carbon nanosheet support promotes the transfer of active intermediates between these active sites,which assists the relay catalysis by improving mass diffusion.Remarkably,the obtained catalyst demonstrates a half-wave potential of up to 0.942 V,a high mass activity of 0.54 A·mgPt^(−1),and negligible decay of activity after 30,000 cycles,which are all superior to the commercial Pt/C catalysts with comparable loading of Pt.The theoretical calculation results reveal that the obtained catalyst with defect structure of carbon support presents enhanced relay catalytic effect of PtNi alloy NPs and single Ni sites,ultimately realizing improved catalytic performance.This work provides valuable inspiration for developing low platinum loading catalyst,integrating single atoms and alloy with outstanding performance in fuel cell.

关 键 词：two-dimensional porous carbon nanosheet Pt-based alloy single atom catalysts relay effect proton-exchange membrane fuel cells 

分 类 号：O64[理学—物理化学]