Electrochemical Quartz Crystal Microbalance(EQCM) Characterization of Electrodeposition and Catalytic Activity of Pd-based Electrocatalysts for Ethanol Oxidation

被引：0
|
作者：
Ke Xi [1 ]
Deng Lu-lu [1 ]
Shen Pei-kang [1 ]
Cu Guo-feng [2 ]
机构：
[1] Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Sch Phys & Engn, Guangzhou 510275, Guangdong, Peoples R China
[2] Sun Yat Sen Univ, Sch Chem & Chem Engn, Guangzhou 510275, Guangdong, Peoples R China
来源：
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES | 2010年 / 26卷 / 03期
关键词：
Coulombic efficiency; Nucleation and growth mechanism; Electrochemical quartz crystal microbalance; Palladium; Ethanol oxidation; ALCOHOL FUEL-CELLS; UNDERPOTENTIAL DEPOSITION; COUPLING REACTIONS; OXYGEN REDUCTION; NANOWIRE ARRAYS; HOLLOW CARBON; THIN-FILMS; ELECTROOXIDATION; GOLD; NANOPARTICLES;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Pd was electrochemically deposited on gold-coated quartz crystals at nanogram-level. The coulombic efficiency and initial nucleation and growth mechanism of potentiostatic Pd deposition were investigated via in situ electrochemical quartz crystal microbalance(EQCM). The coulombic efficiencies are 84%, 93% and 95% for Pd deposition at 0.3, 0.2 and 0.1 V(vs. SCE), respectively. The results of chronoamperometric measurements show that the Pd deposition proceeded by an instantaneous nueleation(at 0.3 V) or progressive nucleation(at 0.2 and 0.1 V) in a three-dimensional(3D) growth mode. The catalytic activity of Pd-based electrocatalyst for ethanol oxidation was characterized in an alkaline solution. It was found that the highest mass activity for ethanol oxidation on Pd-based electrocatalyst is 1.8x10(4) A/(g Pd) deposited at 0.3 V for 5 s.
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页码：443 / 448
页数：6
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