期刊
ELECTROCHIMICA ACTA
卷 192, 期 -, 页码 196-204出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.201
关键词
Oxygen reduction reaction; Layered double hydroxides; Reduced graphene oxide; Electrocatalysts; Transition metals
资金
- Anhui Provincial Natural Science Foundation [1408085QB27]
- National Natural Science Foundation of China [21471007]
- AHNU Innovation Foundation [2014yks081]
Precious metal-free electrocatalysts with high efficiency and durability for the oxygen reduction reaction (ORR) are strongly desired in the field of energy technology. Herein, the CoAl layered double hydroxides (CoAl-LDHs)/reduced graphene oxide (rGO) composites were successfully prepared by growing CoAl-LDHs on the surface of GO in situ via coprecipitation and subsequently hydrothermal treatment. The structure, composition, morphology and ORR catalytic activity of the CoAl-LDHs/rGO composites were investigated as a function of mass ratios of CoAl-LDHs and GO. The results show that there is an optimum mass ratio of CoAl-LDHs and GO (w(CoAl-LDHs): w(GO) = 1:5) for the ORR catalytic activity, where the electron transfer number for ORR at the CoAl-LDHs/rGO composites reaches to 3.5, closing to the full four-electron process. The synergistic effect between CoAl-LDHs and rGO is discussed in detail and the discussion is instructive for the construction of the better transition metal oxides/carbon composite-based ORR catalysts. (C) 2016 Elsevier Ltd. All rights reserved.
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