Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7724246 | International Journal of Hydrogen Energy | 2011 | 14 Pages |
Abstract
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 520Â 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.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yu-Chen Wei, Chen-Wei Liu, Hung-Wen Lee, Shu-Ru Chung, Sheng-Long Lee, Ting-Shan Chan, Jyh-Fu Lee, Kuan-Wen Wang,