Spectroelectrochemical Evaluation of Rh Microparticles as Electrocatalyst for Carbon Monoxide and Formic Acid Oxidation

 

R. Ortiz,^a) O. P.  Márquez,^a)* J. Márquez,^a) Claudio Gutiérrez^b)

 

^a)Universidad de Los Andes, Facultad de Ciencias. Departamento de Química. Laboratorio de Electroquímica. Mérida 5101 – Venezuela

^b)Consejo Superior de Investigaciones Científicas, Instituto de Química Física “Rocasolano”, Madrid – España.

 

Received 20 April 2005; accepted in revised form 17 October 2005

 

 

Abstract

Electrooxidation of carbon monoxide and formic acid was performed on Rh microparticles deposited on both, Glassy Carbon (Rh/GC) and polyaniline films (Rh/PANI), to evaluate the electrocatalytic activity of those electrodes. The deposit of Rh microparticles on those substrates provides a higher surface and exhibits a better electrocatalytic activity compared with that shown by smooth Rh for the electrochemical oxidation of formic acid in sulphuric acid. The oxidation of CO and HCOOH on Rh/GC and Rh/PANI was followed using in situ Multi-Step FTIR Spectroscopy (MS-FTIRS). Either linear or bridge bonded adsorbed CO (CO_l, CO_b), has been observed by FTIRS as the main species. In comparison to the adsorption of CO on smooth Rh surface, the IR features of CO adsorbed on Rh/GC and Rh/PANI electrodes showed an anomalous behaviour.

Keywords: rhodium microparticles, electrocatalysis, carbon monoxide, formic acid, FTIR study.

 

 

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* Corresponding author. E-mail address: reynaldo@ula.ve