期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 712, 期 -, 页码 223-229出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2013.11.011
关键词
Heat-treatment; Pd oxide-based catalysts; Oxide reduction; ORR; ESA
资金
- Department of Science and Technology (DST), India [SR/S1/PC-68/2012]
Pd-Co catalysts of various compositions are subjected to heat-treatment in an oxygen-containing atmosphere (5% oxygen and 95% argon by volume) and the catalysts are found to form oxides. On exposure to electrochemical conditions, the oxides get reduced in the potential range of 0.05-0.4 V of the voltammogram and the voltammetric features of the heat-treated catalyst are comparable to that of the corresponding as-prepared catalyst of same composition. The trends in electrochemical surface area (ESA), current due to formation of adsorbed-oxygenated species and activity towards oxygen reduction reaction (ORR) with catalyst composition are similar and they are in the order of Pd << Pd1.5Co < PdCo < Pd6.3Co < Pd2Co < Pd3Co. The ORR activity of the catalyst subjected to the oxidative thermal treatment is higher than that of Pd and the corresponding as-prepared catalyst of same composition. (C) 2013 Elsevier B.V. All rights reserved.
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