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Role of Electronic Perturbation in Stability and Activity of Pt-Based Alloy Nanocatalysts for Oxygen Reduction

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Title
Role of Electronic Perturbation in Stability and Activity of Pt-Based Alloy Nanocatalysts for Oxygen Reduction
Author(s)
Hwang, Seung Jun; Kim, Soo-Kil; Lee, June-Gunn; Lee, Seung-Cheol; Jang, Jong Hyun; Kim, Pil; Lim, Tae-Hoon; Yung Eun Sung; Yoo, Sung Jong
Publication Date
2012-12
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.134, no.48, pp.19508 - 19511
Publisher
AMER CHEMICAL SOC
Abstract
The design of electrocatalysts for polymer electrolyte membrane fuel cells must satsify two equally important fundamental principles: optimization of electrocatalytic activity and long-term stability in acid media (pH <1) at high potential (0.8 V). We report here a solution-based approach to the preparation of Pt-based alloy with early transition metals and realistic parameters for the stability and activity of Pt3M (M = Y, Zr, Ti, Ni, and Co) nanocatalysts for oxygen reduction reaction (ORR). The enhanced stability and activity of Pt-based alloy nanocatalysts in ORR and the relationship between electronic structure modification and stability were studied by experiment and DFT calculations. Stability correlates with the d-band fillings and the heat of alloy formation of Pt3M alloys, which in turn depends on the degree of the electronic perturbation due to alloying. This concept provides realistic parameters for rational catalyst design in Pt-based alloy systems.
URI
https://pr.ibs.re.kr/handle/8788114/1416
ISSN
0002-7863
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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