Enhanced electrocatalytic performance on polymer-stabilized graphene decorated with alloy nanoparticles for ethanol oxidation reaction in alkaline media

被引:44
作者
Dutta, Abhijit [1 ]
Ouyang, Jianyong [1 ]
机构
[1] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117548, Singapore
关键词
Electrocatalysis; Graphene; Nanoparticles; Alloy; AuPt; FUEL-CELLS; METHANOL ELECTROOXIDATION; ULTRAFAST REDUCTION; CHEMICAL-REDUCTION; FACILE SYNTHESIS; COMPOSITE FILMS; OXIDE; AU; PD; ACID;
D O I
10.1016/j.apcatb.2014.04.018
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
We explore a green method to grow metal alloy nanoparticles (NPs) on reduced graphene oxide stabilized with polyvinylpyrrolidone (PVP) in aqueous solution with sodium borohydride as a reducing agent for metal ions. PVP was used to stabilize nano-graphene sheets (NGs) in solution and prevent their aggregation. The synthetic experimental conditions were studied to control the size, shape and distribution of alloy nanoparticles anchored on the graphene sheets. AuPt nanoparticles on PVP-stabilized graphene (PVP-NGs-AuPt) show higher catalytic activity and stability than those on graphene without PVP (NGs-AuPt) toward the ethanol oxidation reaction (EOR) in alkaline media. PVP-NGs-AuPt can increase the EOR peak current density by more than 160%, similar to 100% and 78% as compared with Pt on carbon, AuPt on carbon and NGs-AuPt, respectively. Moreover, the poisoning of PVP-NGs-AuPt during the EOR is less significant than that of NGs-AuPt, as revealed by analyzing the intermediates products, acetate and carbonate, by ion exchange chromatography. The high electrocatalytic activity of PVP-NGs-AuPt is attributed to the surface activation by OH- and the interaction between the AuPt NPs and graphene, which can improve the CO oxidation within the applied potential range. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:119 / 128
页数:10
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