期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 32, 页码 16867-16873出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta04330a
关键词
-
资金
- Australian Research Council [DP150100765]
The development of non-precious metal catalysts for efficient oxygen reduction is of significance for many advanced electrochemical devices such as fuel cells and metal-air batteries. Herein, we develop a graphene-directed assembly route to synthesize hierarchically nanoporous Co-N-x/C materials with a macro/meso/microporous structure, high specific surface area (i.e. 512 m(2) g(-1)) and excellent conductivity using graphene oxide (GO) supported zeolitic imidazolate framework nanocrystal arrays as a catalyst precursor, followed by the carbonization and acid leaching process. In this route, GO acts as a structure-directing agent to construct ZIF nanocrystal arrays supported on GO nanosheets. During the carbonization process, the resulting reduced graphene oxide functions as a binder and electrical conductor to connect individual ZIF-derived carbon nanoparticles into the macroporous structure and increase the overall conductivity. ZIF nanocrystals themselves are also converted into meso/microporous carbon nanoparticles without using any other template. The hierarchically porous Co-N-x/C materials exhibit high ORR catalytic activity, superior stability and good methanol tolerance under both alkaline and acidic conditions.
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