期刊
CARBON
卷 89, 期 -, 页码 8-19出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.03.026
关键词
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资金
- Key Program Projects of the National Natural Science Foundation of China [21031001]
- National Natural Science Foundation of China [51108162, 20971040, 51210105014, 21001042, 91122018]
- Natural Science Foundation of Heilongjiang Province [B201411]
- Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China [708029]
- Excellent Young Teachers Fund of Heilongjiang University
- Hundred Young Talents in Heilongjiang University
Low efficiency of oxygen reduction reaction (ORR) across cathode interfaces constitutes an obstacle to the bioelectricity generation in microbial fuel cells (MFCs). Advances in the property of carbon-based catalysts for ORR will have far-reaching implications for MFCs. Melamine is used as both carbon and nitrogen sources for preparing nitrogen-doped Fe-species/partly-graphitized carbon (Fe-species/NPGq catalysts at relatively low temperature (640-700 degrees C). Main crystalline phases in Fe-species/NPGC-x (x = 640, 650, 660 and 700) change from iron carbide (Fe(3)G) to alpha-Fe as temperature increases. The O-C=O groups and structurally-bonded nitrogen (Fe-bonded N, pyridinic N and pyrrolic N) in PGC skeleton are favorable for improving electrical conductivity and catalytic activity. Single chamber MFCs with Fe/Fe3C/NPGC-650 generate power density of 1323 mW m(-2), which is higher than those of Fe-species/NPGC-x (x = 640, 660 and 700) and Pt/C (1191 mW m(-2)). Minimum power density decline (1.75%) is achieved by Fe/NPGC-660, which is far lower than that (17.11%) of Pt/C. The highest coulombic efficiency (30%) is obtained by Fe/Fe3C/NPGC-650 due to the sufficient active-sites (embedded Fe3C or Fe-N species) and easy charge transport across the triphase interfaces, which are conducive to capture-consume the electrons for catalyzing ORR. (C) 2015 Elsevier Ltd. All rights reserved.
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