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Electrocatalytic Activity of Nano-Sized Ebonex/Pt for Underpotential Deposition of Hydrogen

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Abstract:

The underpotential deposition of hydrogen was studied in 0.5 mol dm-3 HClO4 solution on an electrode based on Ebonex-supported platinum electrocatalyst spread on rotation Au disk electrode (Ebonex/Pt). Pt catalyst was prepared by the impregnation method from 2-propanol solution of Pt(NH3)2(NO2)2 and Ebonex powder. Ebonex support (nonstoichiometric mixture of titanium oxides) was characterized by: X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and BET techniques. The synthesized catalyst was analyzed by TEM technique. Voltammetric profiles at the Ebonex/Pt catalyst surface in 0.5 mol dm-3 HClO4 aqueous solution obtained at different temperatures with the evaluation of the temperature effect on the reversible adsorption of the Hupd state are presented and the thermodynamic state functions for H adatom adsorption process are calculated. The chemisorptive energy strength of the Ebonex/Pt-H state is estimated in order to establish the relationship between the surface structure and the electrocatalytic activity of Ebonex/Pt electrode and compare it to the one for smooth polycrystalline Pt.

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Periodical:

Materials Science Forum (Volume 518)

Pages:

253-258

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.518.253

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Online since:

July 2006

Authors:

Lj.M. Vračar, N. Krstajić, N. Elezović

Keywords:

Ebonex, Hydrogen Underpotential Deposition, Nano-Sized Catalyst

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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