期刊
MATERIALS RESEARCH BULLETIN
卷 47, 期 1, 页码 135-141出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2011.09.016
关键词
Oxides; Chemical synthesis; Electrochemical measurements; Electrochemical properties
The oxygen reduction reaction (ORR) was studied on Sr2MMoO6 (M = Fe and Co) double perovskites, prepared by a solid-state reaction, in 0.5 M NaOH at 25 degrees C with a rotating disk electrode (RDE). The two oxide powders were characterized by X-ray diffraction, scanning electron microscopy and BET analysis. The electrochemical techniques considered are linear voltammetry, steady state polarization and ac impedance spectroscopy. The electrocatalysts (SFMO/C, SCMO/C) consisting of the double perovskite oxides and carbon (Vulcan XC-72) were mixed and spread out into a thin layer on a glassy carbon substrate. At room temperature, a significantly electrocatalytic activity is observed for both electrocatalysts. Compared to SFMO/C, the SCMO/C electrocatalyst was found to show a relatively high electrocatalytic activity for O-2 reduction, which agrees well with the results obtained using the ac impedance spectroscopy. (C) 2011 Elsevier Ltd. All rights reserved.
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