Participation in Negative Capacitance of Diffusion-Controlled Voltammograms of Hemin.

ABSTRACT: Hemin in dimethyl sulfoxide solution has exhibited voltammograms controlled by diffusion at glassy carbon electrodes for slow scan rates, although it is adsorbed slightly. In contrast, voltammograms for high scan rates, v > 1 V s^-1, were governed by some kinds of kinetics judging from the scan rate dependence of peaks. The kinetics is close to that of a ferrocenyl derivative, in which the currents include the capacitive component with negative values. The capacitive one can be identified with the proportionality to the scan rates. The variation of the peak currents with v yielded -200 μF cm^-2. This negative value, being associated with the charge transfer reaction, makes cyclic voltammograms deviated downward from the diffusion-controlled behavior, resem

SUBMITTER: Aoki KJ 

PROVIDER: S-EPMC7675926 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature