Reversible electrochemistry of cytochrome c on recompressed, binderless exfoliated graphite electrodes


Autoria(s): Rikhie, J; Sampath, S
Data(s)

01/05/2005

Resumo

The direct electrochemistry of cytochrome c (cyt-c) has been investigated on exfoliated graphite (EG) electrodes. The as-polished and roughened (using SiC emery sheet) EG surfaces are inactive for the direct electron transfer. However, when the EG electrode was sonicated before the experiment, a pair of redox waves were obtained for freely diffusing cyt-c in the solution phase. The formal potential was found to be 0.01 V (vs. SCE) in 0.1 M phosphate buffer at a pH of 7.1. The electrochemical response for the adsorbed cyt-c on sonicated EG electrodes, which is shown to have carbonyl functional groups on its surface, shows nearly reversible voltammograms in the same electrolyte. However, the formal potential in the adsorbed state is more negative than that observed for the solution phase cyt-c. A structure based on an open heme conformation proposed by Hildebrandt and Stockburger is probably present on the EG surface. It is suggested that the electrochemistry at the EG electrode is essentially governed by favourable electrostatic interactions.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/27371/1/paper.pdf

Rikhie, J and Sampath, S (2005) Reversible electrochemistry of cytochrome c on recompressed, binderless exfoliated graphite electrodes. In: Electroanalysis, 17 (9). pp. 762-768.

Publicador

John Wiley and Sons

Relação

http://www3.interscience.wiley.com/journal/109801573/abstract

http://eprints.iisc.ernet.in/27371/

Palavras-Chave #Inorganic & Physical Chemistry
Tipo

Journal Article

PeerReviewed