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


Article Preview

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.



Edited by:

Dragan P. Uskokovic, Slobodan K. Milonjic and Dejan I. Rakovic




L.M. Vračar et al., "Electrocatalytic Activity of Nano-Sized Ebonex/Pt for Underpotential Deposition of Hydrogen", Materials Science Forum, Vol. 518, pp. 253-258, 2006

Online since:

July 2006




[1] J. Clavilier, A. Rodes, K.E. Achi and M.A. Zamakhchari: J. Chim. Phys. Vol. 88 (1991), p.1291.

[2] J. Clavilier, A. Rodes, K.E. Achi and M.A. Zamakhchari: J. Chim. Phys. Vol. 372 (1994), p.268.

[3] N. Furuya and S. Motoo: J. Electroanal. Chem. Vol. 172 (1984), p.339.

[4] G. Jerkiewicz and A. Zolfaghari: J. Electrochem. Soc. Vol. 143 (1996), p.1240.

[5] G. Jerkiewicz and A. Zolfaghari: J. Phys. Chem. Vol. 100 (1996), p.8454.

[6] K. Christmann: Surf. Sci. Rep. Vol. 9 (1988), p.1.

[7] S. Trasatti: J. Electroanal. Chem. Vol. 39 (1972), p.163.

[8] Lj. Vračar, N. Krstajić, S.G. Neophytides and J. Jakšić: Int. J. of Hydrogen Energ Vol. 30 (2005), p.393.

[9] L. Brewer: Science Vol. 161 (1968), p.115.

[10] M.L.B. Rao, A. Damjanović and J.O. M. Bockris: J. Phys. Chem. Vol. 67 (1963), p.2508.

[11] A. Zalfaghari and G. Jerkiewicz: Solid-Liquid Electrochemical Interfaces, G. Jerkiewicz, M.P. Soriaga, K. Uosaki, K. Wieckowski (Eds. ) (Washington 1997), Ch. 4.

DOI: https://doi.org/10.1021/bk-1997-0656

[12] A. Zolfaghari, S. Blais and G. Jerkiewicz: Electrochemical Surface Science of Hydrogen Adsorption and Absorption, G. Jerkiewicz, P. Marcus (Eds. ) (The Electrochemical Society, PV 97-16, Pennington 1995).

[13] A. Zolfaghari and G. Jerkiewicz: J. Electroanal. Chem. Vol. 467 (1999), p.177.