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    Porous Core‐Shell Platinum‐Silver Nanocatalyst for the Electrooxidation of Methanol


    Singh, Baljit and Seddon, Brian and Dempsey, Eithne and Redington, Wynette and Dickinson, Calum (2015) Porous Core‐Shell Platinum‐Silver Nanocatalyst for the Electrooxidation of Methanol. Electroanalysis, 27 (1). pp. 135-143. ISSN 1040-0397

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    Abstract

    A new class of platinum‐silver nanomaterial for the catalytic electrooxidation of methanol is considered here. The material was synthesised on a carbon nanochips platform via a combination of chemical reduction to form a particulate bimetallic alloy (Pt2Ag1/f‐CNC) and an anodic‐etching process to form a unique porous core‐shell platinum‐silver nanoparticle (np‐Pt2Ag1/f‐CNC). Morphology, structural and compositional characterisations of the alloy were performed using transmission electron microscopy (TEM), energy‐dispersive X‐ray spectrometry (EDX), thermogravimetric analysis (TGA) and X‐ray diffraction (XRD) techniques. Data confirms average particle size of 2.07 nm (median 1.73 nm). The alloy nature of the nanoparticle was confirmed by XRD and TEM/EDX analysis. The np‐Pt2Ag1/f‐CNC material was examined in electrochemical studies as a catalyst for the oxidation of methanol in sulfuric acid electrolyte. Catalytic efficiency is reported in terms of oxidation current density, 134.8 mA mg−1 (platinum mass) and a current ratio, If/Ib=0.86. The electrochemical data is indicative of high catalytic rates for methanol conversion, as well as the effectiveness of porous core‐shell platinum‐silver particles to resist carbon monoxide poisoning. The work demonstrates improved long‐term catalytic performance of a novel nanomaterial electrode offering promising energy applications.

    Item Type: Article
    Keywords: Fuel cell; Platinum‐silver nanocatalyst; Core‐shell nanoparticle; Methanol electrooxidation;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 12526
    Identification Number: https://doi.org/10.1002/elan.201400434
    Depositing User: Eithne Dempsey
    Date Deposited: 05 Mar 2020 16:56
    Journal or Publication Title: Electroanalysis
    Publisher: Wiley
    Refereed: Yes
    URI:

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