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Electrochemical Behaviour of a Composite Rh/TiO2 Layer Formed Potentiodynamically on Titanium Surface

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Abstract:

Potentiodynamic polarization of a mechanically polished titanium electrode in a diluted solution of Rhodium(III) chloride in 0.1 M perchloric acid was performed, resulting in simultaneous formation of both Rh and TiO2 films. The morphology of obtained Rh/TiO2 composite film followed the morphology of titanium support, as evidenced by SEM technique. This composite surface was examined by cyclic voltammetry in both acidic and alkaline solutions, in the potential region of both hydrogen and oxygen underpotential deposition. The charge related to hydrogen underpotential deposition corresponded to a surface roughness of 43. As a consequence of high surface roughness, the diffusion current of oxygen reduction in an oxygen saturated 0.1 M NaOH solution, measured by voltammetry on rotating disc electrode, was found to be comparable to the current of hydrogen underpotential deposition.

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Periodical:

Materials Science Forum (Volume 518)

Pages:

265-270

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.518.265

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Online since:

July 2006

Authors:

S. Mentus, Ivan Krstić, Ž. Tešić, Amelia Montone

Keywords:

Electrocatalysis, Hydrogen Underpotential Deposition, Oxygen Reduction Reaction, Rh/TiO2 Composite Layer, Rhodium Electrodeposition

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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