期刊
JOURNAL OF POWER SOURCES
卷 251, 期 -, 页码 55-65出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.11.031
关键词
Nitrogen doped holey graphene; Oxygen reduction reaction; Supercapacitor; Hydrothermal synthesis; Potassium hydroxide etching
资金
- Chinese National Natural Science Foundation [11105078]
- Outstanding Talent and Team Plans Program South China University of Technology
Nitrogen doped holey graphene (NHG), with in-plane holes in its sheet plate, has been synthesized in this work through the potassium hydroxide (KOH) etching and ball milling of nitrogen doped graphene (NG). It shows that the KOH etching and ball milling does not distinctly alter the elemental composition and the relative percentages of functional groups in NG, but produce holes in its in-plane sheet plate. The obtained NHG can then be used as an active electrode material for supercapacitors and as an active electrocatalyst for oxygen reduction reaction, and exhibits significantly higher electrochemical performance than the corresponding NG. Its improved electrochemical performance could be attributed to its specific holey structure in the sheet plate and porous structure in its randomly stacked solid, which provide it with more active edge atoms, better accessibility to electrolyte, larger accommodation space for ions, faster electrolyte diffusion and movement and so on. (C) 2013 Elsevier B.V. All rights reserved.
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