Stability of ceria supports in Pt-CeOx/C catalysts

Ou, Ding Rong, Mori, Toshiyuki, Fugane, Keisuke, Togasaki, Hirotaka, Ye, Fei and Drennan, John (2011) Stability of ceria supports in Pt-CeOx/C catalysts. Journal of Physical Chemistry C, 115 39: 19239-19245. doi:10.1021/jp205640k

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Author Ou, Ding Rong
Mori, Toshiyuki
Fugane, Keisuke
Togasaki, Hirotaka
Ye, Fei
Drennan, John
Title Stability of ceria supports in Pt-CeOx/C catalysts
Formatted title
Stability of ceria supports in Pt-CeOx/C catalysts
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
Publication date 2011-10
Sub-type Article (original research)
DOI 10.1021/jp205640k
Volume 115
Issue 39
Start page 19239
End page 19245
Total pages 7
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2012
Language eng
Formatted abstract
Pt–CeOx/C (1.5 ≤ x ≤ 2) catalysts are promising electrode materials in polymer electrolyte membrane fuel cells (PEMFCs), especially in direct methanol fuel cells. In this study, the chemical and microstructural features of the catalysts before and after electrocatalytic reactions were compared, and then the stability of ceria supports in the catalysts was studied. It was found that, during the impregnation of Pt on ceria, Pt particles will invade into the ceria supports and the ceria will be partly reduced. Subsequently, in an acidic condition that is required in a fuel cell using an acid-based polymer electrolyte, the ceria supports were instable and easily dissolved into the sulfuric acid solution. As a result, only a small amount of ceria remains around/between the Pt particles. The experimental result suggested that the dissolution of ceria could be due to the partial reduction of the ceria supports in the as-prepared catalysts. Although only a small amount of ceria could remain in the catalysts, it can effectively prevent the growth and sintering of Pt particles and contribute to the CO tolerance and higher catalytic activities of the Pt–CeOx/C catalysts.
Keyword Energy-loss spectroscopy
Methanol fuel-cell
Oxide nanoparticles
Co oxidation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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