期刊
ELECTROCHIMICA ACTA
卷 81, 期 -, 页码 313-320出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.07.022
关键词
Nitrogen doping; Graphene; Oxygen reduction; Non-precious metal catalysts; Fuel cells
资金
- Ministry of Science and Technology of China under the National Basic Research Program [2012CB215500, 2012CB932800]
- National Natural Science Foundation of China [20973131]
A non-precious metal electrocatalyst based on nitrogen-doped graphene (NG) was synthesized through a single step heat-treatment of a precursor mixture containing graphene oxide, urea, carbon black (CB) and small amount of iron species. The structure, morphology and composition of the prepared materials were characterized with a variety of techniques. XRD and Raman measurements showed the presence of distorted graphene layers. BET, TEM and cyclic voltammagram results indicated that CB served as spacer to prevent NG sheets from agglomerating, leading to enhanced dispersion of NG sheets. XPS analysis gave a total surface nitrogen concentration of similar to 4 at.%, with the pyridinic nitrogen being the main component. Rotating electrode measurements revealed that the NG electrocatalyst can efficiently catalyze the oxygen reduction reaction (ORR), with activities equivalent to Pt/C in alkaline medium and approaching to Pt/C in acid medium, and with nearly 4-electron pathway selectivity. (c) 2012 Elsevier Ltd. All rights reserved.
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