Synergistic effect of Co alloying and surface oxidation on oxygen reduction reaction performance for the Pd electrocatalysts

Yu Chen Wei, Chen Wei Liu, Hung Wen Lee, Shu Ru Chung, Sheng Long Lee, Ting Shan Chan, Jyh Fu Lee, Kuan Wen Wang

研究成果: 雜誌貢獻期刊論文同行評審

28 引文 斯高帕斯(Scopus)

摘要

The synergistic effect of Co alloying and oxidation treatment induced progressive enhancement on oxygen reduction reaction (ORR) activities of Pd/C catalysts is studied. Based on the XPS characterization, a new term, degree of surface oxidation (DSO), is proposed to illustrate their relationship between ORR activity and surface oxidation extent. TPR characterization also provides the evolution of surface species within the topmost region. It can be obviously found the optimal temperature for the promotion of ORR activity on various oxidized samples is 520 K. On the other hand, various heat treatment atmospheres (H2 and CO) are applied on Pd-Co system without changing their particle size. It is clearly evident that the oxidized catalysts can exhibit the superior performance relative to that of the non-oxidized ones, confirming the improved ORR activity is solely ascribed to the formation of surface PdO species with 100% DSO value rather than large particle size effect. Moreover, an explainable model is demonstrated to illustrate the promotional effect of ORR performance on the oxidized PdCo/C catalysts.

原文???core.languages.en_GB???
頁(從 - 到)3789-3802
頁數14
期刊International Journal of Hydrogen Energy
36
發行號6
DOIs
出版狀態已出版 - 3月 2011

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