A high-efficiency microwave approach to synthesis of Bi-modified Pt nanoparticle catalysts for ethanol electro-oxidation in alkaline medium

Authors:   Yiyin Huang, Jindi Cai, Yonglang Guo

Abstract:
The Bi-modified Pt nanoparticle catalysts using multi-walled carbon nanotubes as supports are prepared through microwave treatment and long-term standing approaches. Bi can easily modify Pt catalyst because of the strong affinity between Bi and Pt. However, only limited amount of Bi and uneven Bimodified Pt catalyst are obtained through the long-term standing approach. The microwave approach can complete the synthesis rapidly and get uniform Bi–Pt/CNT catalysts. X-ray photoelectron spectroscopy shows that Bi (III) and Pt (0) species are the main form in the Bi–Pt/CNT catalyst. Cyclic voltammetry indicates that the modification of Bi on Pt/CNTs leads to an enhanced activity up to 260% compared to Pt/CNTs for ethanol electro-oxidation. The current of Bi–Pt/CNTs (0.1:1) is 44.8 times higher than that of Pt/CNTs at −0.3V for 1800 s. Linear current sweep results reveal that the electro-oxidation of residual intermediate species can be effectively promoted because the adsorption of OH_ad species is enhanced by the addition of Bi to Pt/CNTs, which is characterized by the higher open circuit potential.

Keywords:
Alkaline fuel cell
Bi modification
Ethanol oxidation
Microwave synthesis
Pt catalyst

Published in: Applied catalysis B: Environmental  (Volume 129, Pages 1-614, 17 January 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

A high-efficiency microwave approach to synthesis of Bi-modified Pt nanoparticle catalysts for ethanol electro-oxidation in alkaline medium

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