HARRICK PLASMA

Indium Tin Oxide Electrodes Modified With Tris(2,2'-bipyridine-4,4'-dicarboxylic acid) Iron(II) and the Catalytic Oxidation of Tris(4,4'-di-tert-butyl-2,2'-bipyridine) Cobalt(II)

Indium tin oxide (ITO) electrodes modified by attachment of tris(2,2'-bipyridine-4,4'-dicarboxylic acid) iron(II) are examined. The mode of attachment is believed to be via the COOH functions in a manner similar to attachment of similar carboxylate-containing compounds to TiO2 surfaces. On the surface the complex resides as a stable electrochemically active monolayer. These modified electrodes can efficiently catalyze the oxidation of certain cobalt complexes, specifically, tris(4,4'-di-tert-butyl-2,2'-bipyridine) cobalt-(II).Onthe unmodified ITO surfaces this cobalt complex is essentially electrochemically inert. The catalytic process approaches diffusional control at very slow scan speeds. Also, the electro-catalysis is sufficiently efficient that the peak oxidation current for Co2+, under certain conditions, exceeds the ip for the surface oxidation of the adsorbed Fe2+ by > x 100 and the current for the uncatalyzed oxidation of Co2+ by considerably more than that.

Elliott, C. Michael, Stefano Caramori, Carlo A. Bignozzi

Langmuir

21

3022-3027

2007-03-01

2005

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