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Issue 39, 2015
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Architecturally designed Pt–MoS2 and Pt–graphene composites for electrocatalytic methanol oxidation

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Abstract

Thin films consisting of platinum nanoparticles (Pt NPs) with uniform size and distribution have been successfully prepared at a liquid–liquid interface. Apart from the usual substrates like glass, Si etc. the films were also deposited on the surfaces of MoS2 thin films and graphene nanosheets (GNS) respectively, by using a layer-by-layer (LbL) deposition technique to form Pt–MoS2 and Pt–GNS composites. The loading concentration of Pt NPs on MoS2 and GNS can be adjusted by selecting the number and sequence of the component layers during LbL deposition. The Pt thin films, Pt–MoS2 and Pt–GNS nanocomposite thin films are characterized using transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). TEM results of the composites show that Pt NPs with sizes in the range of 1 to 3 nm are uniformly dispersed on the MoS2/GNS surface. The catalytic activities of Pt and Pt-composites for the reaction of methanol oxidation are studied using cyclic voltammetry and chronoamperometry. Electrochemical studies reveal that both the Pt–MoS2 and Pt–GNS nanocomposites show excellent electrocatalytic activity towards methanol oxidation. Pt–MoS2 and Pt–GNS nanocomposite electrodes show excellent stability for reuse of the catalyst. A probable mechanism of catalysis has been discussed. We propose that the similar architecture reported here would be promising for the synthesis of high performance catalysts for fuel cells, gas phase reactions, and other applications such as sensors.

Graphical abstract: Architecturally designed Pt–MoS2 and Pt–graphene composites for electrocatalytic methanol oxidation

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Supplementary files

Article information


Submitted
15 Jul 2015
Accepted
30 Aug 2015
First published
01 Sep 2015

Phys. Chem. Chem. Phys., 2015,17, 26101-26110
Article type
Paper

Architecturally designed Pt–MoS2 and Pt–graphene composites for electrocatalytic methanol oxidation

S. H. Patil, B. Anothumakkool, S. D. Sathaye and K. R. Patil, Phys. Chem. Chem. Phys., 2015, 17, 26101
DOI: 10.1039/C5CP04141D

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