The photoelectrochemical properties of TiO2 electrodes modified by quantumsized PbS and thiols

Photoelectrochemical electrodes have been prepared by chemical deposit of q uantum sized PbS particles (Q-PbS) on TiO2 nanocrystalline films and follow ed by the modification of such electrodes with thiols. The photoelectrochem ical properties have been studied. The results show that Q-PbS modified TiO 2 electrodes generate photocurrent as high as 542.5 muA/cm(2) under irradia tion of a 400 nm light, but it undergoes photodegradation. The modification with thiols leads to an improvement in terms of increased photostability, although the photocurrent decreases due to the resistance brought about by the carbon chains of thiols. (C) 2001 Elsevier Science BN. All rights reser ved.