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KMID : 1059519930370020213
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Journal of the Korean Chemical Society
1993 Volume.37 No. 2 p.213 ~ p.219
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Photocurrents in the SnO2 Photoelectrochemical Cell Sensitized by Rhodamine B
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Min Hyun-Jin
Kim Gi-Bum
Yu Jeong-A
Kim Kang-Jin
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Abstract
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The electrochemical spectral sensitization of SnO2 electrodes with rhodamine B was studied. Photocurrent was measured in the presence of a variety of supersensitizers including ascorbic acid and KI. In the presence of ascorbic acid, the increase in the concentration of ascorbic acid, pH of the solution, or the potential applied to SnO2 up to 0.6 V vs. SCE enhanced the photocurrent. However, ascorbic acid produced considerably high dark current due to its low reduction potential. On the other hand, KI produced low but stable photocurrent. The results, together with the solvent effect on the photocurrent, were taken into account to elucidate the mechanism of photosensitization in the presence of ascorbic acid or KI.
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KEYWORD
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