• 文献标题:   Synergistic enhancement of oxygen reduction reaction with BC3 and graphitic-N in boron- and nitrogen-codoped porous graphene
  • 文献类型:   Article
  • 作  者:   QIN L, WANG LC, YANG X, DING RM, ZHENG ZF, CHEN XH, LV BL
  • 作者关键词:   b ncodoped porous graphene, orr, znair battery, specific activity, dft
  • 出版物名称:   JOURNAL OF CATALYSIS
  • ISSN:   0021-9517 EI 1090-2694
  • 通讯作者地址:   Chinese Acad Sci
  • 被引频次:   14
  • DOI:   10.1016/j.jcat.2018.01.013
  • 出版年:   2018

▎ 摘  要

Rational design and optimization of metal-free electrocatalysts for the oxygen reduction reaction (ORR) is crucial for fuel cells and metal-air batteries. However, identifying design principle that links the active sites and their synergistic effects is far from satisfactory, especially for B,N-codoped graphene. Herein, we provide four B,N-codoped porous graphenes with tunable contents of pyridinic N, graphitic N, BC3 and C-B(N)O. BC3 shows multiple-fold specific activity compared with graphitic N and pyridinic N, while C-B(N)O offers no positive contribution. Density functional theory calculations indicate that the synergistic effect between graphitic N and BC3 can effectively facilitate the reduction of O-2. These pinpoint that graphitic N and BC3 are the main active sites among various nitrogen or/and boron doping configurations. The most active catalyst exhibits superior activity than the commercial Pt/C catalyst using the RDE method in alkaline media, and displays comparable power density to Pt/C catalyst in Zn-air battery. (C) 2018 Elsevier Inc. All rights reserved.