期刊
BIOSENSORS & BIOELECTRONICS
卷 102, 期 -, 页码 101-105出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2017.11.022
关键词
Cobalt phosphide; Durability; Network structure; Nitrogen doping; Residual biomass
类别
资金
- National Natural Science Foundation of China [51578218, 51508342]
- Natural Science Foundation of Heilongjiang Province [QC2015009]
- Scientific and Technological Innovation Talents of Harbin [2016RQQXJ119]
- Graduate Student Innovation Research Projects of Heilongjiang University [YJSCX2017-059HLJU]
Exploration of noble-metal free catalysts with high oxygen reduction reaction (ORR) activity and durability as alternatives for platinum/carbon (Pt/C) in microbial fuel cells (MFCs) remains a great challenge. This study reports the preparation of nitrogen-doped cobalt/cobalt phosphide/carbon (Co/Co2P/NC) catalysts via an in situ simultaneous doping/reduction method by using residual cornstalks as carbon source. Effects of carbonization temperature on structural characteristics and catalytic activity of Co/Co2P/NC catalysts are investigated. Co/Co2P/NC-850 with regular network structure obtains the maximum power density of 972 5 mW m(-2), which is higher than that of Pt/C (808 5 mW m(-2)). The highest Coulombic efficiency (23.1%) and the lowest charge transfer resistance (0.93 Omega) are also obtained by Co/Co2P/NC (850 degrees C). ORR catalyzed by Co/Co2P/NC-850 is mainly via 4e(-) reduction pathway. The better durability of Co/Co2P/NC (850 degrees C) is detected from long-term operation of MFCs. The promising catalytic activity for ORR is attributed to the introduction of Co/Co2P nanoparticles/Schottky junctions and N species in porous carbon skeleton, which are served as active sites to trap and consume electrons. Biomass-derived carbon with good electrical conductivity can provide large specific surface area and abundant interconnected holes, which contribute to efficient permeation and transport of O-2. The synergistic effects between porous structure and sufficient active sites can energetically boost catalytic activity to improve ORR efficiency. These Co/Co2P/NC catalysts with durable power outputs are expected to have more extensive applications in MFCs.
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