Abstract
Ac-modulated UV-vis reflectance spectroscopy was applied to elucidate the electrode reaction rate of the species immobilized on electrode surfaces. The electroreflectance (ER) with respect to the electrode potential at constant wavelength, denoted as ER voltammetry, was analyzed theoretically using numerical calculation. In the present calculation, the amplitude of the ac modulation, the IR drop due to the solution resistance, and the double layer capacitance were taken into account. The results of the calculation were compared to the electrode reaction of cytochrome c immobilized on an SH(CH2)9COOH self-assembled monolayer modified gold electrode, which has previously been studied. The standard rate constant of the electrode reaction of cytochrome C3 adsorbed directly on gold electrode was determined to be 200 s-1 using non-linear least square fitting to the experimental data. This approach is applicable to unstable redox species at the electrode surface, e.g. cytochrome c3, which desorbs gradually from the gold electrode surface at negative electrode potential. That is, one can determine the kinetic parameters of adsorbed redox species by a single potential scan.
| Original language | English |
|---|---|
| Pages (from-to) | 15-20 |
| Number of pages | 6 |
| Journal | Journal of Electroanalytical Chemistry |
| Volume | 408 |
| Issue number | 1-2 |
| Publication status | Published - 1996 May 30 |
| Externally published | Yes |
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Keywords
- Cytochrome c
- Cytochrome c
- Electron transfer rate
- Electroreflectance (ER) voltammogram
- Thiol-modified gold electrode
ASJC Scopus subject areas
- Chemical Engineering(all)
- Analytical Chemistry
- Electrochemistry
Cite this
Determination of the electrode kinetic parameters of a species immobilized on electrodes using the electroreflectance (ER) voltammogram. / Feng, Zhi Qiang; Imabayashi, Shinichiro; Kakiuchi, Takashi; Niki, Katsumi.
In: Journal of Electroanalytical Chemistry, Vol. 408, No. 1-2, 30.05.1996, p. 15-20.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Determination of the electrode kinetic parameters of a species immobilized on electrodes using the electroreflectance (ER) voltammogram
AU - Feng, Zhi Qiang
AU - Imabayashi, Shinichiro
AU - Kakiuchi, Takashi
AU - Niki, Katsumi
PY - 1996/5/30
Y1 - 1996/5/30
N2 - Ac-modulated UV-vis reflectance spectroscopy was applied to elucidate the electrode reaction rate of the species immobilized on electrode surfaces. The electroreflectance (ER) with respect to the electrode potential at constant wavelength, denoted as ER voltammetry, was analyzed theoretically using numerical calculation. In the present calculation, the amplitude of the ac modulation, the IR drop due to the solution resistance, and the double layer capacitance were taken into account. The results of the calculation were compared to the electrode reaction of cytochrome c immobilized on an SH(CH2)9COOH self-assembled monolayer modified gold electrode, which has previously been studied. The standard rate constant of the electrode reaction of cytochrome C3 adsorbed directly on gold electrode was determined to be 200 s-1 using non-linear least square fitting to the experimental data. This approach is applicable to unstable redox species at the electrode surface, e.g. cytochrome c3, which desorbs gradually from the gold electrode surface at negative electrode potential. That is, one can determine the kinetic parameters of adsorbed redox species by a single potential scan.
AB - Ac-modulated UV-vis reflectance spectroscopy was applied to elucidate the electrode reaction rate of the species immobilized on electrode surfaces. The electroreflectance (ER) with respect to the electrode potential at constant wavelength, denoted as ER voltammetry, was analyzed theoretically using numerical calculation. In the present calculation, the amplitude of the ac modulation, the IR drop due to the solution resistance, and the double layer capacitance were taken into account. The results of the calculation were compared to the electrode reaction of cytochrome c immobilized on an SH(CH2)9COOH self-assembled monolayer modified gold electrode, which has previously been studied. The standard rate constant of the electrode reaction of cytochrome C3 adsorbed directly on gold electrode was determined to be 200 s-1 using non-linear least square fitting to the experimental data. This approach is applicable to unstable redox species at the electrode surface, e.g. cytochrome c3, which desorbs gradually from the gold electrode surface at negative electrode potential. That is, one can determine the kinetic parameters of adsorbed redox species by a single potential scan.
KW - Cytochrome c
KW - Cytochrome c
KW - Electron transfer rate
KW - Electroreflectance (ER) voltammogram
KW - Thiol-modified gold electrode
UR - http://www.scopus.com/inward/record.url?scp=0030145080&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030145080&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0030145080
VL - 408
SP - 15
EP - 20
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 0022-0728
IS - 1-2
ER -