期刊
ELECTROCHIMICA ACTA
卷 161, 期 -, 页码 115-123出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.02.048
关键词
LaMn1-xCoxO3; Graphene; Nanocomposite; Oxygen reduction reaction
资金
- National Natural Science Foundation of China [51402253]
- Independent Research Program for the Young Teachers of Yanshan University [14LGA007]
Cobalt doped LaMnO3-graphene composites are prepared by sol-gel process assisted with chelating effect of citric acid. The structure, morphology and valence state of samples are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). Results show that LaMn1-xCoxO3 particles are homogeneously dispersed on graphene nanosheets, and that doping Co does not change the pervoskite structure. Electrochemical properties are characterized by rotating disk electrode (RDE), rotating ring-disk electrode (RRDE), galvanostatic discharge and AC impedance spectra techniques. The sample prepared with x = 0.1 possesses excellent electrocatalytic activity for oxygen reduction reaction (ORR) and good electrochemical stability in alkaline medium. The measurements of RDE and RRDE reveal that the electron transfer number of LaMn0.9Co0.1O3-graphene is calculated to be 3.87. All the above results indicate that the LaMn1-xCoxO3-graphene composites are promising catalysts with a high catalytic activity toward ORR. (C) 2015 Elsevier Ltd. All rights reserved.
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