Effect of doping order on metal-free heteroatoms dual-doped carbon as oxygen reduction electrocatalyst

作     者：Hui-Juan Zhang Jing Geng Chunlei Cai Zi-Feng Ma Zhong Ma Wenli Yao Junhe Yang Hui-Juan Zhang;Jing Geng;Chunlei Cai;Zi-Feng Ma;Zhong Ma;Wenli Yao;Junhe Yang

作者机构：School of Materials Science and EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Department of Chemical and Biomolecular Engineering.University of Illinois at Urbana-ChampaignUrbanaIllinois 61801United States Department of Chemical EngineeringShanghai Jiaotong UniversityShanghai 200240China Department of Chemical EngineeringWaterloo Institute for Nanotechnology(WIN)University of WaterlooWaterlooOntario N2L3G1Canada Jiangxi Key Laboratory of Power Battery and MaterialFaculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2021年第32卷第2期

页      面：745-749页

核心收录：

学科分类：0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：the financial support of this work by the National Natural Science Foundation of China (No.21406139) the Development Project of University of Shanghai for Science and Technology (No.2019KJFZ019) the Scientific Research Innovation Project of Shanghai Education Commission (No.2019-01-07-0007-E00015) the Basic Research Project (No.19JC1410402) 

主　　题：Oxygen reduction reaction Metal-free electrocatalyst Heteroatoms dual-doped carbon Doping order N P S and F 

摘      要：Metal-free heteroatoms dual-doped carbon has been recognized as one of the most promising Pt/C-substitutes for oxygen reduction reaction(ORR).Herein,we optimize the preparation process by doping order of metal-free heteroatoms to obtain the best electrocatalytic performance through three types of dual-doped carbon,including XC-N(first X doping then N doping),NC-X(first N doping then X doping) and NXC(N and X doping)(X=P,S and F).XC-N has more defect than the other two indicated by Raman spectra.X-ray photoelectron spectrom(XPS) measurements indicate that N and X have been dual-doped into the carbon matrix with different doping contents and modes,Electrocatalytic results,including the potential of ORR peak(Ep),the half-wave potential,the diffusion-limiting current density mainly follows the order of XC-NNC-X NXC,Furthermore,the synergistic effect of second atom doping are also compared with the single doped carbon(NC,PC,SC and FC).The differences in electronegativity and atomic radius of these metal-free heteroatoms can affect the defect degree,the doping content and mode of hete roatoms on carbon matrix,induce polarization effect and space effect to affect O2 adsorption and product desorption,ultimately to the ORR electrocatalytic performance.