Microwave Reflectance Studies of Photoelectrochemical Kinetics at Semiconductor Electrodes. 3. Photolectrochemical Reduction of Ru(NH3)6 3+ at p-Si

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...

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Published in:The journal of physical chemistry. B 2004-02, Vol.108 (8), p.2660-2665
Main Authors: Peter, Laurence M, Ushiroda, Shin
Format: Article
Language:English
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Summary: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.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp0311963