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Type: Artigo de periódico
Title: Ferrocenecarboxylic acid adsorbed on Nb2O5 film grafted on a SiO2 surface: NADH oxidation study
Author: Pessoa, CA
Gushikem, Y
Kubota, LT
Abstract: Ferrocenecarboxylic acid was adsorbed on a Nb2O5 film grafted on a porous SiO2 surface, resulting in a modified silica, presenting the following characteristics: amount of attached Nb2O5 = 0.58 mmol g(-1), amount of ferrocenecarboxylic acid (HOOCFeCp2) = 0.12 mmol g(-1) and specific surface area S-BET = 294 m(2) g(-1) with an average surface density delta = 0.23 molecules nm(-2) or an average intermolecular distance of 2 nm. The organometallic complex is adhered to the surface by forming the Nb-OOC bond and, thus, the electroactive species is not easily leached out from the surface under various oxidation-reduction cycles of the central metal in a cyclic voltammetry experiment. The midpoint potential, E,,, is observed at 0.29 V versus SCE and it remains practically unchanged in various supporting electrolyte solutions and also is not significantly affected by pH changes between 1 and 7.5. An electrode made with this material, SiNb-O2CFeCp2, mediates NADH oxidation at 0.35 V in solution at pH 6. Kinetics studies were evaluated by using the rotating disk electrode technique in order to understand the mechanism of NADH oxidation on the SiNb-O2CFeCp2 modified electrode. (C) 2001 Elsevier Science Ltd. All rights reserved.
Subject: ferrocenecarboxylic acid
niobium oxide
NADH oxidation
cyclic voltammetry
RDE studies
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: Electrochimica Acta. Pergamon-elsevier Science Ltd, v. 46, n. 16, n. 2499, n. 2505, 2001.
Rights: fechado
Identifier DOI: 10.1016/S0013-4686(01)00453-4
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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