• 文献标题:   N-doped graphene coupled with Co nanoparticles as an efficient electrocatalyst for oxygen reduction in alkaline media
  • 文献类型:   Article
  • 作  者:   ZHANG G, LU WT, CAO FF, XIAO ZD, ZHENG XS
  • 作者关键词:   oxygen reduction reaction, noble metalfree electrocatalyst, ndoped graphene, encapsulation, pyrolysi
  • 出版物名称:   JOURNAL OF POWER SOURCES
  • ISSN:   0378-7753 EI 1873-2755
  • 通讯作者地址:   Huazhong Agr Univ
  • 被引频次:   84
  • DOI:   10.1016/j.jpowsour.2015.10.055
  • 出版年:   2016

▎ 摘  要

Development of low-cost and highly efficient electrocatalysts for oxygen reduction reaction (ORR) is still a great challenge for the large-scale application of fuel cells and metal-air batteries. Herein, a noble metal-free ORR electrocatalyst in the form of N-doped graphene coupled with part of Co nanoparticles encased in N-doped graphitic shells (named as SUCo-0.03-800) is prepared by facile one-step pyrolysis of the mixture of sucrose, urea and cobalt nitrate. The novel structure is confirmed by High Resolution-TEM, XRD, XPS and Raman spectroscopy. SUCo-0.03-800 presents comparable ORR catalytic activity to commercial Pt/C catalyst with a dominating four-electron pathway under alkaline conditions, and both of its mass activity and volume activity also outperform Co-free N-doped graphene and other COIN C hybrids with higher Co content, which may probably be ascribed to the high specific surface area, novel structure and synergistiC effect between encased Co nanoparticles and N-doped graphitic shell. Additionally, SUC0-0.03-800 also shows outstanding stability and improved selectivity towards ORR, making it a promising alternative to Pt with potential application in fuel cells and metal-air batteries. (C) 2015 Elsevier B.V. All rights reserved,