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Catalysts 2016, 6(9), 144; doi:10.3390/catal6090144

Facile Synthesis of Bimetallic Pt-Ag/Graphene Composite and Its Electro-Photo-Synergistic Catalytic Properties for Methanol Oxidation

1
College of Chemistry & Chemical Engineering, Fujian Normal University, Fuzhou 350007, China
2
Key Lab of Design & Assembly of Functional Nanostructure, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian, China
*
Author to whom correspondence should be addressed.
Academic Editors: Vincenzo Baglio and David Sebastián
Received: 25 July 2016 / Revised: 7 September 2016 / Accepted: 9 September 2016 / Published: 16 September 2016
(This article belongs to the Special Issue Catalysis for Low Temperature Fuel Cells)
View Full-Text   |   Download PDF [7284 KB, uploaded 16 September 2016]   |  

Abstract

A Pt-Ag/graphene composite (Pt-Ag/GNs) was synthesized by the facile aqueous solution method, in which Ag+ was first transformed into Ag2O under UV light irradiation, and then Ag2O, Pt2+, and graphene oxide (GO) were simultaneously reduced by formic acid. It was found that Pt-Ag bimetallic nanoparticles were highly dispersed on the surface of graphene, and their size distribution was narrow with an average diameter of 3.3 nm. Electrocatalytic properties of the Pt-Ag/GNs composite were investigated by cyclic voltammograms (CVs), chronoamperometry (CA), CO-stripping voltammograms, and electrochemical impedance spectrum (EIS) techniques. It was shown that the Pt-Ag/GNs composite has much higher catalytic activity and stability for the methanol oxidation reaction (MOR) and better tolerance toward CO poisoning when compared with Pt/GNs and the commercially available Johnson Matthey 20% Pt/C catalyst (Pt/C-JM). Furthermore, the Pt-Ag/GNs composite showed efficient electro-photo-synergistic catalysis for MOR under UV or visible light irradiation. Particularly in the presence of UV irradiation, the Pt-Ag/GNs composite exhibited an ultrahigh mass activity of 1842.4 mA·mg−1, nearly 2.0 times higher than that without light irradiation (838.3 mA·mg−1). View Full-Text
Keywords: platinum; silver; graphene; methanol oxidation; electro-photo catalysis platinum; silver; graphene; methanol oxidation; electro-photo catalysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Xu, S.; Ye, L.; Li, Z.; Wang, Y.; Lei, F.; Lin, S. Facile Synthesis of Bimetallic Pt-Ag/Graphene Composite and Its Electro-Photo-Synergistic Catalytic Properties for Methanol Oxidation. Catalysts 2016, 6, 144.

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