Influence of gas environment and heating on atomic structures of platinum nanoparticle catalysts for proton-exchange membrane fuel cells

Kenta Yoshida, Xudong Zhang, Yusuke Shimada, Yasuyoshi Nagai, Tomoki Hiroyama, Nobuo Tanaka, Leonardo Lari, Michael R. Ward, Edward D. Boyes, Pratibha L. Gai

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Atomic-scale relaxations of platinum nanoparticles (Pt NPs) for fuel-cell catalysts are evaluated by spherical-aberration corrected environmental transmission electron microscopy (ETEM) under reference high-vacuum and N 2 atmospheres, and then under reactive H 2 , CO and O 2 atmospheres, combined with ex situ durability test using an electrochemical half-cell. In high-vacuum, increasing roughness due to continuous relaxation of surface-adsorbed Pt atoms is quantified in real-space. Under H 2 and N 2 atmospheres at a critical partial pressure of 1 ×10 -2 Pa the stability of the surface facets is for the first time found to be improved. The adsorption behaviour of CO molecules is investigated using experimentally measured Pt-Pt bond lengths on the topmost surface layer of Pt NPs. The deactivation of Pt NPs in the anode environment of a proton-exchange-membrane fuel-cell is demonstrated at the atomic-scale in the ETEM, and the transformation of NPs into disordered nanoclusters is systematically quantified using the partial size distribution of Pt atomic clusters under controlled heating experiments at 423, 573 and 723 K.

本文言語English
論文番号175701
ジャーナルNanotechnology
30
17
DOI
出版ステータスPublished - 2019

ASJC Scopus subject areas

  • バイオエンジニアリング
  • 化学 (全般)
  • 材料科学(全般)
  • 材料力学
  • 機械工学
  • 電子工学および電気工学

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