Defect structure analysis of heterointerface between Pt and CeOx promoter on Pt electro-catalyst

Fugane, Keisuke, Mori, Toshiyuki, Yan, Pengfei, Masuda, Takuya, Yamamoto, Shunya, Ye, Fei, Yoshikawa, Hideki, Auchterlonie, Graeme and Drennan, John (2015) Defect structure analysis of heterointerface between Pt and CeOx promoter on Pt electro-catalyst. ACS Applied Materials and Interfaces, 7 4: 2698-2707. doi:10.1021/am507754w

Author Fugane, Keisuke
Mori, Toshiyuki
Yan, Pengfei
Masuda, Takuya
Yamamoto, Shunya
Ye, Fei
Yoshikawa, Hideki
Auchterlonie, Graeme
Drennan, John
Title Defect structure analysis of heterointerface between Pt and CeOx promoter on Pt electro-catalyst
Journal name ACS Applied Materials and Interfaces   Check publisher's open access policy
ISSN 1944-8252
Publication date 2015-02-04
Year available 2015
Sub-type Article (original research)
DOI 10.1021/am507754w
Open Access Status
Volume 7
Issue 4
Start page 2698
End page 2707
Total pages 10
Place of publication Washington, DC United States
Publisher American Chemical Society
Collection year 2016
Language eng
Formatted abstract
Pt–CeOx/C (1.5 ≤ x ≤ 2) electro-catalyst is one of the most promising cathode materials for use in polymer membrane electrolyte fuel cells. To clarify the microstructure of Pt–CeOx heterointerface, we prepared Pt-loaded CeOx thin film on conductive SrTiO3 single crystal substrate by using a stepwise process of pulse laser deposition method for the preparation of epitaxial growth CeOx film followed by an impregnation method which loaded the Pt particles on the CeOx film. The electrochemistry observed for the Pt-loaded CeOx thin film on the conductive single crystal substrate was examined by using cyclic voltammetry in 0.5 M H2SO4 aqueous solution, and a cross-sectional image of the aforementioned Pt–CeOx thin film electrode was observed using a transmission electron microscope. The electrochemistry observed for Pt–CeOx thin film electrode clearly showed the promotion effect of CeOx. Also, the microanalysis indicated that unique, large clusters that consisted of C-type rare-earth-like structures were formed in the Pt–CeOx interface by a strong interaction between Pt and CeOx. The present combination analysis of the electrochemistry, microanalysis, and atomistic simulation indicates that the large clusters (i.e., 12 (PtCe′′–Vo••) + 2 (PtCe′′–2Vo••–2CeCe′)) that were formed into the Pt–CeOx interface promoted the charge transfer between Pt surface and CeOx, suggesting that the oxygen reduction reaction activity on Pt can be maximized by fabrication of C-type rare-earth-like structure that consists of the aforementioned large clusters in the Pt–CeOx interfaces.
Keyword Pt-CeOx interfaceatomistic simulation
Promotion effect of CeOx
Pt cathode
Fuel cell
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Centre for Microscopy and Microanalysis Publications
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