Microwave reflectance studies of photoelectrochemical kinetics at semiconductor electrodes. 3. Photolectrochemical reduction of Ru(NH3)(6)(3+) at p-Si

L M Peter, S Ushiroda

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Abstract

The reduction of Ru(NH3)(6)(3+) at illuminated p-Si in ammonium fluoride solutions was studied by a light modulated microwave reflectivity method. Ru(NH3)(6)(3+) was chosen as an example of a one electron outer sphere redox system that is expected to exhibit facile electron transfer kinetics. The results of the microwave measurements show that the transfer of photogenerated electrons to Ru(NH3)(6)(3+) at an illuminated p-Si electrode is very slow compared to an order of magnitude estimate for outer sphere electron transfer. It is concluded that the reduction of Ru(NH3)(6)(3+) does not involve direct electron transfer from the conduction band but is instead mediated by photogenerated hydrogen states.
LanguageEnglish
Pages2660-2665
Number of pages6
JournalJournal of Physical Chemistry B
Volume108
Issue number8
DOIs
StatusPublished - 2004

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Microwaves
Semiconductor materials
Electrodes
Kinetics
Electrons
Microwave measurement
Conduction bands
Hydrogen

Cite this

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title = "Microwave reflectance studies of photoelectrochemical kinetics at semiconductor electrodes. 3. Photolectrochemical reduction of Ru(NH3)(6)(3+) at p-Si",
abstract = "The reduction of Ru(NH3)(6)(3+) at illuminated p-Si in ammonium fluoride solutions was studied by a light modulated microwave reflectivity method. Ru(NH3)(6)(3+) was chosen as an example of a one electron outer sphere redox system that is expected to exhibit facile electron transfer kinetics. The results of the microwave measurements show that the transfer of photogenerated electrons to Ru(NH3)(6)(3+) at an illuminated p-Si electrode is very slow compared to an order of magnitude estimate for outer sphere electron transfer. It is concluded that the reduction of Ru(NH3)(6)(3+) does not involve direct electron transfer from the conduction band but is instead mediated by photogenerated hydrogen states.",
author = "Peter, {L M} and S Ushiroda",
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TY - JOUR

T1 - Microwave reflectance studies of photoelectrochemical kinetics at semiconductor electrodes. 3. Photolectrochemical reduction of Ru(NH3)(6)(3+) at p-Si

AU - Peter,L M

AU - Ushiroda,S

N1 - ID number: ISI:000189152000026

PY - 2004

Y1 - 2004

N2 - The reduction of Ru(NH3)(6)(3+) at illuminated p-Si in ammonium fluoride solutions was studied by a light modulated microwave reflectivity method. Ru(NH3)(6)(3+) was chosen as an example of a one electron outer sphere redox system that is expected to exhibit facile electron transfer kinetics. The results of the microwave measurements show that the transfer of photogenerated electrons to Ru(NH3)(6)(3+) at an illuminated p-Si electrode is very slow compared to an order of magnitude estimate for outer sphere electron transfer. It is concluded that the reduction of Ru(NH3)(6)(3+) does not involve direct electron transfer from the conduction band but is instead mediated by photogenerated hydrogen states.

AB - The reduction of Ru(NH3)(6)(3+) at illuminated p-Si in ammonium fluoride solutions was studied by a light modulated microwave reflectivity method. Ru(NH3)(6)(3+) was chosen as an example of a one electron outer sphere redox system that is expected to exhibit facile electron transfer kinetics. The results of the microwave measurements show that the transfer of photogenerated electrons to Ru(NH3)(6)(3+) at an illuminated p-Si electrode is very slow compared to an order of magnitude estimate for outer sphere electron transfer. It is concluded that the reduction of Ru(NH3)(6)(3+) does not involve direct electron transfer from the conduction band but is instead mediated by photogenerated hydrogen states.

U2 - 10.1021/jp0311963

DO - 10.1021/jp0311963

M3 - Article

VL - 108

SP - 2660

EP - 2665

JO - Journal of Physical Chemistry B

T2 - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

SN - 1520-6106

IS - 8

ER -