Phase Stabilized and Enhanced PtCu3/C Oxygen Reduction Electrocatalysts via Au Galvanic Displacement

被引：0
|
作者：
Liu, Zengcai [1 ]
Yu, Chengfei [1 ]
Strasser, Peter [1 ]
机构：
[1] Univ Houston, Dept Chem & Biomol Engn, Houston, TX 77204 USA
来源：
NANOTECH CONFERENCE & EXPO 2009, VOL 3, TECHNICAL PROCEEDINGS: NANOTECHNOLOGY 2009: BIOFUELS, RENEWABLE ENERGY, COATINGS FLUIDICS AND COMPACT MODELING | 2009年
关键词：
stabilization; PtCu3/C; oxygen reduction electro catalysts; galvanic displacement; SURFACE SEGREGATION; PT-CO; PLATINUM; CARBON; CU; DURABILITY; CATALYSTS; DISSOLUTION; CORROSION;
D O I：
暂无
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Dealloyed PtCu3/C catalysts have shown 3-4 times higher mass and specific activities for oxygen reduction over pure Pt/C catalysts. We reported here that the enhanced electrocatalytic oxygen reduction activity of PtCu3/C catalysts was stabilized using Au galvanic displacement of Cu in PtCu3/C. The results showed that mass activities decreased by 24 and 29%, and specific activities decreased by 6 and 26% for Pt/C and PtCu3/C catalysts, respectively, while PtCu3/C modified by Au can retain both mass and specific activities after 1000 potential cycles between 0.6 and 1.0V vs RHE. XRD patterns showed that additional peaks related to Au-rich phase appeared, while the peaks related to PtCu alloy phase didn't change much. Au atoms inhibited Pt oxidation and helped to keep favorable Pt-Pt distances created by dealloying, thus improving the stability of ORR activity on PtCu3/C catalysts.
引用
收藏
页码：66 / 69
页数：4
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