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

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (3): 443-448.

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

KE Xi¹, DENG Lu-lu¹, SHEN Pei-kang^1* and CUI Guo-feng^2*

1. State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering;
2. School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China

Received:2009-05-07 Revised:2009-07-03 Online:2010-05-25 Published:2010-07-27
Contact: SHEN Pei-kang. E-mail: stsspk@mail.sysu.edu.cn; CUI Guo-feng. E-mail: cuigf@mail.sysu.edu.cn
Supported by:
Supported by the Guangdong Science and Technology Key Projects, China(Nos.2007A010700001, 2007B090400032), Guangzhou Science and Technology Key Projects, China(Nos.2007Z1-D0051, SKT[2007]17-11) and the Scientific Research Foundation for Young Teachers of the Sun Yat-Sen University, China(No.2006-31000-1131214).

Abstract

Abstract:

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 nucleation(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 1.8×10⁴ A/(g Pd) deposited at 0.3 V for 5 s.

Key words: Coulombic efficiency; Nucleation and growth mechanism; Electrochemical quartz crystal microbalance; Palladium; Ethanol oxidation

KE Xi, DENG Lu-lu, SHEN Pei-kang* and CUI Guo-feng*. Electrochemical Quartz Crystal Microbalance(EQCM) Characterization of Electrodeposition and Catalytic Activity of Pd-based Electrocatalysts for Ethanol Oxidation[J]. Chemical Research in Chinese Universities, 2010, 26(3): 443-448.

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

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