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South African Journal of Chemistry
versão On-line ISSN 1996-840X
versão impressa ISSN 0379-4350
S.Afr.j.chem. (Online) vol.65 Durban 2012
RESEARCH ARTICLE
Highly active, carbon-supported, PdSn nano-core, partially covered with Pt, as catalysts for methanol oxidation
Hui WangI; Vladimir LinkovII; Shan JiII, *; Wei ZhangI; Ziqiang LeiI; Rongfang WangI, II, *
IKey Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Gansu Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China
IISouth African Institute for Advanced Materials Chemistry, University of the Western Cape, Cape Town, 7535, South Africa
ABSTRACT
Carbon-supported, Pt partially covered, PdSn alloy nanoparticles (Pt-PdSn/C) were synthesized via a metathetical reaction of PdSn alloy nanoparticles, and a platinum precursor. The electrochemical activity was evaluated by methanol oxidation. The Pt-PdSn/C catalysts were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and cyclic voltammograms (CV). TEM showed that Pt grows layer-by-layer on the surface of PdSn cores and the thickness of the Pt shell is 0.2 nm, about 1-2 monolayers thick. Cyclic voltammetry results showed that PdSn/C nanoparticles, partially covered by Pt, have a better electrocatalystic performance than conventional PtRu/C and PtPdSn/C catalysts. Electrochemical active surface areas of the Pt-PdSn/C was 2.30 times larger than that of PtRu/C and 1.8 times higher than that of PtPdSn/C catalysts. The results showed that a metathetical reaction is an efficient way of preparing, low Pt loading, highly active electrocatalyst, for methanol oxidation, thus offering great potential for producing Pt-based electrocatalyst for direct methanol fuel cells on a large scale.
Keywords: Electrocatalyst, fuel cell, methanol oxidation, Pt-decorated
Full text available only in PDF format.
Acknowledgements
The authors would like to thank the State Natural Science Foundation of China (21163018), the Postdoctoral Science Foundation of China (20110490847) and the South African NRF (SUR2008060900021) for financially supporting this work.
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Received 8 December 2011
Revised 16 February 2012
Accepted 13 March 2012
* To whom correspondence should be addressed. E-mail: sji@uwc.ac.za (S.J.) / wrf38745779@26.com (R.W.)