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Promoting effects of La for improved oxygen reduction activity and high stability of Pt on Pt-La alloy electrodes
- Authors
- Yoo, Sung Jong; Hwang, Seung Jun; Lee, June-Gunn; Lee, Seung-Cheol; Lim, Tae-Hoon; Sung, Yung-Eun; Wieckowski, Andrzej; Kim, Soo-Kil
- Issue Date
- Jun-2012
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- ENERGY & ENVIRONMENTAL SCIENCE, v.5, no.6, pp 7521 - 7525
- Pages
- 5
- Journal Title
- ENERGY & ENVIRONMENTAL SCIENCE
- Volume
- 5
- Number
- 6
- Start Page
- 7521
- End Page
- 7525
- ISSN
- 1754-5692
1754-5706
- Abstract
- The design of polymer electrolyte fuel cell electrocatalysts depends on two equally important fundamental principles: the optimization of electrocatalytic activities as well as the long-term stability under operating conditions (e.g., pH < 1 and E > 0.8 V). Pt-based alloys with transition metals (i.e., Pt-La) address both of these key issues. The oxygen reduction kinetics depends on the alloy composition which, in turn, is related to the d-band center position. The stability of the oxygen reduction reaction is predictable by correlation of the d-band fillings and vacancies of Pt-M (M = Ti, Fe, Zr and La).
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