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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 18, Number 6
BKCSDE 18(6)
June 20, 1997 

Photoinduced Electron Transfer from Excited Ruthenium Complexes at Nanocrystalline TiO2 Electrodes
Jong Hyun Bae, Donghwan Kim, Yeong Il Kim, Kang-Jin Kim
Photoinduced electron transfer from the charge-transfer excited states of Ru(tpy)(bpy(COOH)2)CN+, Ru(tpy)(bpy(COOH)2)Cl+, Ru(tpy)(bpy(COOH)2)) H2O2+, and Ru(tpy)(bqu(COOH)2)Cl+ to the conduction band of TiO2 has been studied through photoelectrochemical methods. Ru(tpy)(bpy(COOH)2) CN+ produced the highest current density and open-circuit photovoltage, whereas Ru(tpy)(bqu(COOH)2)Cl+ produced the lowest values. A potential barrier was employed to explain the experimental result that the rate of the electron transfer increases with increasing the energy difference between the donor and acceptor. A sensitizer with a high current density yielded a high photovoltage and a high conversion efficiency. The reduction rate of the oxidized sensitizer decreased with the increases in the reduction potential of the sensitizer, resulting in a poor stability of a photoelectrochemical cell.
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