摘要
Platinum-based materials show excellent electrocatalytic performance and have good potential for use in fuel cells.However,the high cost and scarce reserves have restricted their wide application.Therefore,it is a challenging task to reduce the amount of Pt as well as ensure good catalytic performance.Herein,anchoring of Pt single atoms(0.21 wt‰)with ultra-low content on g-C_(3)N_(4)nanosheets(Pt_(0.21)/CN)has been successfully achieved.The obtained Pt_(0.21)/CN catalyst shows excellent two-electron oxygen reduction(2e-ORR)capability for hydrogen peroxide(H_(2)O_(2)).Compared with CN,its H_(2)O_(2)selectivity increased from 80%to 98%in 0.1M KOH,surpassing those in most of the reported studies.Besides,the H_(2)O_(2)production rate of Pt_(0.21)/CN is 767 mmol gcat^(-1)h-1,which is 11.1 times that of CN.This work may pave the way toward the development of an effective method for the design of noblemetal electrocatalysts with low metal loading and high catalytic activity.
基金
This work was financially supported by the Gansu Provincial Natural Science Foundation of China(Nos.21JR7RA493,17JR5RA198,2020HZ‐2,21JR7RA470)
the Cooperation project of Gansu Academy of Sciences(2020HZ‐2)
the Fundamental Research Funds for the Central Universities(Nos.lzujbky‐2018‐119,lzujbky‐2018‐ct08,lzujbky‐2019‐it23)
Key Areas Scientific and Technological Research Projects in Xinjiang Production and Construction Corps(No.2018AB004)
Hubei University of Arts and Science(No.2020kypytd002)
Xiangyang Science and Technology Research and Development(No.2020YL09)
the Science and Technology Research Project of Hubei Provincial Department of Education(No.D20212603)
All the DFT calculations were supported by the Supercomputing Center of Lanzhou University
All SEM,TEM,and HAADFSTEM were supported by the Electron Microscopy Centre of Lanzhou University.
