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One-step Synthesis of Polyoxometalate Encapsulating Pt Based Electrocatalyst for Methanol Oxidation

Abstract

Methanol oxidation is a very important reaction in diret methanol fuel cells. Developing stable and efficient Pt-based catalysts with a simple method has been on the stage recently. Herein, we employed a convenient one-pot method to synthesize polyoxometalates (POMs) encapsulating Pt nanoparticles spreading on a few layers of graphene oxide with a nickel foam as a conductive substrate. Four kinds of samples with different Pt loading were finally obtained by adjusting H2PtCl6 concentration, named as PPGN-n (n = 1, 2, 3, 4). The microscopic structure of the sample was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. It was proved that small-sized Pt nanoparticles with ca. 2.47 nm diameter spreaded on graphene oxide (GO) with the nickle foam support were successfully synthesized. The electrocatalytic activities of methanol oxidation for all the electrocatalysts in electrocatalytic tests are higher than commercial Pt/C. The mass activity of PPGN-1 can be achieved 250.6 mAmg−1. During the synthesis, POM was a bifunctional reagent as a reductant for reducing PtCl2-6 and a stabilizer for the regulation of Pt nanoparticle size simultaneously. POM cooperated rapid synthesis of Pt nanoparticles can offer a new route to design and synthesise electrocatalysts.

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Publication details

The article was received on 20 Sep 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ03593D
Citation: New J. Chem., 2017, Accepted Manuscript
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    One-step Synthesis of Polyoxometalate Encapsulating Pt Based Electrocatalyst for Methanol Oxidation

    S. Gao, X. Yang, M. Wei, S. Liang, H. Zang, T. Huaqiao, Y. Wang and Y. Li, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03593D

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