期刊
ADVANCED MATERIALS
卷 30, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706330
关键词
covalent organic frameworks; heteroatom-doped carbon; oxygen reduction reaction; template pyrolysis; 2D carbon
类别
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [24245030]
- ENEOSHydrogen Trust Fund
- Ogasawara Foundation for the Promotion of Science and Engineering
Progress over the past decades in porous materials has exerted great effect on the design of metal-free carbon electrochemical catalysts in fuel cells. The carbon material must combine three functions, i.e., electrical conductivity for electron transport, optimal pores for ion motion, and abundant heteroatom sites for catalysis. Here, an ideal carbon catalyst is achieved by combining two strategiesthe use of a 2D covalent organic framework (COF) and the development of a suitable template to guide the pyrolysis. The COF produces nanosized carbon sheets that combine high conductivity, hierarchical porosity, and abundant heteroatom catalytic edges. The catalysts achieve superior performance to authentic Pt/C with exceptional onset potential (0 V vs -0.03 V), half-wave potentials (-0.11 V vs -0.16 V), high limit current density (7.2 mA cm(-2) vs 6.0 mA cm(-2)), low Tafel slope (110 mV decade(-1) vs 121 mV decade(-1)), long-time stability, and methanol tolerance. These results reveal a novel material platform based on 2D COFs for designing novel 2D carbon materials.
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