Nucleation Mechanism and Electrocatalysis of Pd NPs onto ITO Electrode in the Electrochemical Deposition Process

doi:10.3969/j.issn.0251-0790.2012.05.026

Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (05): 1011.doi: 10.3969/j.issn.0251-0790.2012.05.026

• Physical Chemistry • Previous Articles Next Articles

Nucleation Mechanism and Electrocatalysis of Pd NPs onto ITO Electrode in the Electrochemical Deposition Process

TANG Jing¹, TIAN Xiao-Chun¹, LIU Yue-Qiang¹, LIN Jian-Hang²

1. Key Laboratory of Analysis and Detection Technology for Food Safety, Ministry of Education and Fujian Province, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, China;
2. Instrumental Measurement and Analysis Center, Fuzhou University, Fuzhou 350002, China

Received:2011-11-03 Online:2012-05-10 Published:2012-05-10

Abstract

Abstract: Pd nanoparticles(NPs) electrodeposited onto indium tin oxide(ITO) surface were applied to the study of the electrocatalytic activity of ethanol. Firstly, cyclic voltammetry and chronoamperometry were employed to study the deposition mechanism at the initial stage of Pd electrodeposition on ITO. The deposition process was irreversible which was controlled by the diffusion of [PdCl₄]^2-, and the diffusion coefficient of[PdCl₄]^2- was calculated to be 2.19?10^-5 cm²/s. Comparing the current transient data at different potentials with those predicted by the instantaneous and progressive nucleation models under diffusion control, progressive three-dimensional nucleation mechanism was proposed for the nucleation of Pd on ITO at -0.1 V. The mechanism changed to the instantaneous nucleation mode at -0.3 V. FESEM images of the electrodeposits show that the size of Pd NPs is affected by the deposition potential and the deposition period. Secondly, the structure of Pd NPs was analyzed with XRD and the electrochemical behavior on ITO was studied in the solution of 0.5 mol/L H₂SO₄, respectively. Finally, the obtained Pd NPs/ITO were applied in the electrocatalysis of 1.0 mol/L ethanol in alkaline solution, which displayed superior electrocatalytic activity.

Key words: Indium tin oxide(ITO), Pd nanoparticles(Pd NPs), Nucleation mechanism, Electrocatalysis

CLC Number:

O646

TrendMD:

TANG Jing, TIAN Xiao-Chun, LIU Yue-Qiang, LIN Jian-Hang. Nucleation Mechanism and Electrocatalysis of Pd NPs onto ITO Electrode in the Electrochemical Deposition Process[J]. Chem. J. Chinese Universities, 2012, 33(05): 1011.

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Nucleation Mechanism and Electrocatalysis of Pd NPs onto ITO Electrode in the Electrochemical Deposition Process

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