A Facile Route to Fabricate Effective Pt/IrO.sub.2 Bifunctional Catalyst for Unitized Regenerative Fuel Cell

In order to fabricate effective bifunctional oxygen catalyst, IrO.sub.2 nanoparticles have been synthesized by hydrothermal method, and Pt/IrO.sub.2 bifunctional catalyst is then prepared by a microwave-assisted polyol process. X-ray diffraction and transmission electron microscopy are employed to c...

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Bibliographic Details
Published in:Catalysis letters 2014-02, Vol.144 (2), p.242
Main Authors: Kong, Fan-Dong, Zhang, Sheng, Yin, Ge-Ping, Liu, Jing, Ling, Ai-Xia
Format: Article
Language:English
Subjects:
Diffraction
Fuel cell industry
Fuel cells
Polyols
X-rays
Online Access:Get full text
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Summary:In order to fabricate effective bifunctional oxygen catalyst, IrO.sub.2 nanoparticles have been synthesized by hydrothermal method, and Pt/IrO.sub.2 bifunctional catalyst is then prepared by a microwave-assisted polyol process. X-ray diffraction and transmission electron microscopy are employed to characterize the catalysts, which reveal that Pt with a particle size of 2-3 nm is deposited on IrO.sub.2 surface. Electrochemical tests indicate that Pt/IrO.sub.2 bifunctional catalyst possesses much higher catalytic activity and durability towards both oxygen reduction reaction and oxygen evolution reaction than pure Pt or pure IrO.sub.2. Kinetic analysis shows that the oxygen reduction reaction on Pt/IrO.sub.2 catalyst mainly follows four-electron pathway.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-013-1150-z