期刊
NANO ENERGY
卷 11, 期 -, 页码 366-376出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2014.11.008
关键词
Carbon nanofiber aerogels; Nitrogen-doped; Electrocatalyst; Zinc-air battery; Oxygen reduction; Bacterial cellulose
类别
资金
- Ministry of Science and Technology of China [2014CB931800, 2013CB933900]
- National Natural Science Foundation of China [21431006, 91022032, 91227103]
- Chinese Academy of Sciences [KJZD-EW-M01-1]
- Hainan Province Science and Technology Department [CXY20130046]
The prohibitive cost and scarcity of the platinum-based eletrocatalysts for oxygen reduction reaction (ORR) in fuel cells and metal-air batteries hamper dramatically the commercialization of theses clean-energy technologies. Here, we develop a highly active nitrogen-doped carbon nanofiber (N-CNF) aerogel metal-free ORR electrocatalyst, prepared by direct pyrolysis of a cheap, green, and mass-producible biomass, i.e., bacterial cellulose, followed by NH3 activation. The N-CNF aerogel inherits the three-dimensional nanofibrous network of bacterial cellulose and meanwhile possess high density of N-containing active sites (5.8 at%) and high BET surface area (916 m(2)/g). Such N-CNF aerogel shows superior ORR activity (half-wave potential of 0.80 V versus reversible hydrogen electrode) and high selectivity (electron-transfer number of 3.97 at 0.8 V), and excellent electrochemical stability (only 20 mV negative shift of half-wave potential after 10,000 potential cycles) in alkaline media. The ORR activity of N-CNF aerogel exceeds that of NH3-treated carbon blacks, carbon nanotubes as well as reduced graphene oxide aerogels, and that of most reported metal-free catalysts. Importantly, when used as a cathode catalyst for constructing the air electrode of Zn-air battery, the N-CNF aerogel exhibits high voltages of 1.34 and 1.25 V at the discharge current densities of 1.0 and 10 mA cm(-2), respectively, which are highly comparable with the state-of-the art Pt/C catalyst (20 wt% Pt, BASF), indicating the great potential of this metal-free catalyst as a promising alternative to the Pt/C for alkaline fuel cells and metal-air batteries. (C) 2014 Elsevier Ltd. All rights reserved.
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