• 文献标题:   Graphene Layers-Wrapped Fe/Fe5C2 Nanoparticles Supported on N-doped Graphene Nanosheets for Highly Efficient Oxygen Reduction
  • 文献类型:   Article
  • 作  者:   HU EL, YU XY, CHEN F, WU YD, HU Y, LOU XW
  • 作者关键词:   graphene, iron carbide, nanoparticle, oxygen reduction reaction
  • 出版物名称:   ADVANCED ENERGY MATERIALS
  • ISSN:   1614-6832 EI 1614-6840
  • 通讯作者地址:   Zhejiang Normal Univ
  • 被引频次:   56
  • DOI:   10.1002/aenm.201702476
  • 出版年:   2018

▎ 摘  要

Synthesis of highly efficient nonprecious metal electrocatalysts for the oxygen reduction reaction (ORR) superior to platinum (Pt) is still a big challenge. Herein, a new highly active ORR electrocatalyst is reported based on graphene layers-wrapped Fe/Fe5C2 nanoparticles supported on N-doped graphene nanosheets (GL-Fe/Fe5C2/NG) through simply annealing a mixture of bulk graphitic carbon nitride (g-C3N4) and ferrocene. An interesting exfoliation-denitrogen mechanism underlying the conversion of bulk g-C3N4 into N-doped graphene nanosheets is revealed. Owing to the high graphitic degree, optimum N-doping level and sufficient active sites from the graphene layers-wrapped Fe/Fe5C2 nanoparticles, the as-prepared GL-Fe/Fe5C2/NG electrocatalyst obtained at 800 degrees C exhibits outstanding ORR activity with a 20 mV more positive half-wave potential than the commercial Pt/C catalyst in 0.1 m KOH solution and a comparable onset potential of 0.98 V. This makes GL-Fe/Fe5C2/NG an outstanding electrocatalyst for ORR in alkaline solution.