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One-step synthesis of Pt based electrocatalysts encapsulated by polyoxometalate for methanol oxidation

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Abstract

Methanol oxidation is a very important reaction in diret methanol fuel cells. Developing stable and efficient Pt-based catalysts with a convenient method has been on the stage recently. Herein, we employed a convenient one-pot method to synthesize Pt nanoparticles encapsulated by polyoxometalates (POMs) spreading on a few layers of graphene oxide with a nickel foam as a conductive substrate. Four kinds of samples with different Pt loadings were finally obtained by adjusting the H2PtCl6 concentration, named as PPGN-n (n = 1, 2, 3, 4). The microscopic structure of the sample was characterized using 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 a diameter of ca. 2.47 nm spreaded on graphene oxide (GO) with the nickle foam support were successfully synthesized. The synthesized electrocatalysts exhibited higher electrocatalytic activities than commercial Pt/C for methanol oxidation in electrocatalytic tests. The mass activity of PPGN-1 of 250.6 mA mg−1 can be achieved. During the synthesis, POM was used as a bifunctional reagent; as a reductant for reducing chloroplatinic acid and a stabilizer for the regulation of the Pt nanoparticle size simultaneously. POM cooperated rapid synthesis of Pt nanoparticles can offer a new route for designing and synthesising electrocatalysts.

Graphical abstract: One-step synthesis of Pt based electrocatalysts encapsulated by polyoxometalate for methanol oxidation

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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., 2018, Advance Article
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    One-step synthesis of Pt based electrocatalysts encapsulated by polyoxometalate for methanol oxidation

    S. Gao, X. Yang, M. Wei, S. Liang, H. Zang, H. Tan, Y. Wang and Y. Li, New J. Chem., 2018, Advance Article , DOI: 10.1039/C7NJ03593D

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