Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (4): 800.doi: 10.7503/cjcu20120658

• Article: Inorganic Chemistry • Previous Articles     Next Articles

Synthesis of Nitrogen-doped Graphene and Its Electrocatalytic Performance Toward Oxygen Reduction Reaction

LI Jing, WANG Xian-Bao, YANG Jia, YANG Xu-Yu, WAN Li   

  1. Faculty of Materials Science and Engineering, Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Ministry of Education, Hubei University, Wuhan 430062, China
  • Received:2012-07-12 Online:2013-04-10 Published:2013-03-18

Abstract:

A series nGs with different electrocatalytic abilities toward oxygen reduction reaction(ORR) was prepared via a two-steps pyrolysis method by controlling the reaction temperature on the physical mixture of graphene oxideand urea. Transmission electron microscopy and scanning electron microscopy display nG with highly wrinkled and overlapping structures. X-ray photoelectron spectroscopy shows that nitrogen is successfu-lly doped in graphene with the formation of pyridinic N, pyrrolic N and graphitic N, and the maximum nitrogen content is 6.6%(molar fraction). Cyclic voltammogram and rotating disk electrode measurement show that nGs exhibit high electrocatalytic activity with an onset potential of 0.1 V in an acid electrolyte. Moreover, the nGs catalyzed oxygen reduction revealed a favorable formation of water via a four-electron pathway and excellent stability over Pt/C catalyst. Furthermore, the nG obtained at 200 ℃ in the first pyrolysis step displays the best catalytic perfor-mance.

Key words: Nitrogen-doped graphene, Urea, Pyrolysis, Oxygen reduction reaction, Electrocatalyst

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