A Facile Route to Fabricate Effective Pt/IrO2 Bifunctional Catalyst for Unitized Regenerative Fuel Cell

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

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Bibliographic Details
Published in:Catalysis letters 2014-02, Vol.144 (2), p.242-247
Main Authors: Kong, Fan-Dong, Zhang, Sheng, Yin, Ge-Ping, Liu, Jing, Ling, Ai-Xia
Format: Article
Language:English
Subjects:
Applied sciences
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Chemistry
Chemistry and Materials Science
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
General and physical chemistry
Industrial Chemistry/Chemical Engineering
Nanoparticles
Organometallic Chemistry
Oxygen evolution reactions
Oxygen reduction reactions
Physical Chemistry
Regenerative fuel cells
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Transmission electron microscopy
Ultrafines
X-ray diffraction
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Summary:In order to fabricate effective bifunctional oxygen catalyst, IrO 2 nanoparticles have been synthesized by hydrothermal method, and Pt/IrO 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 2 surface. Electrochemical tests indicate that Pt/IrO 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 2 . Kinetic analysis shows that the oxygen reduction reaction on Pt/IrO 2 catalyst mainly follows four-electron pathway. Graphical Abstract Ultrafine Pt particles (2–3 nm) are supported on the surface of amorphous IrO 2 to form Pt/IrO 2 bifunctional catalyst that possesses higher catalytic activities towards both OER and ORR.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-013-1150-z