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

被引：8

作者：

Xu, Shuhong ^{[1
]}

Ye, Lingting ^{[2
]}

Li, Zhongshui ^{[1
]}

Wang, Yanli ^{[1
]}

Lei, Fengling ^{[1
]}

Lin, Shen ^{[1
]}

机构：

[1] Fujian Normal Univ, Coll Chem & Chem Engn, Fuzhou 350007, Peoples R China

[2] Chinese Acad Sci, Key Lab Design & Assembly Funct Nanostruct, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R China

来源：

CATALYSTS | 2016年 / 6卷 / 09期

基金：

中国国家自然科学基金;

关键词：

platinum; silver; graphene; methanol oxidation; electro-photo catalysis; REDUCED GRAPHENE OXIDE; ONE-POT SYNTHESIS; ELECTROCATALYTIC ACTIVITY; OXYGEN REDUCTION; NANOPARTICLES; NANOSPHERES; NANOSHEETS; HYBRID; ELECTROOXIDATION; PERFORMANCE;

D O I：

10.3390/catal6090144

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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)).

引用

页数：13

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