Effect of Cl- and Br- ions and pH on the flatband potentials of silver halide sheet crstal electrodes.
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概要
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Flatband potential (<I>E</I><SUB>fb</SUB>), which coincides with the Fermi level in energy, was determined for AgCl and AgBr electrodes by electrochemical measurement of the capacitance of the space charge layer of a semiconductor in contact with a solution. The values of <I>E</I><SUB>fb</SUB> for both AgCl and AgBr electrodes in an electrolyte solution were −4.8 V <I>vs.</I> vacuum. The energy levels of the electrodes could be determined from this value. The behavior of the AgCl electrode is somewhat like an n-type semiconductor, and that of the AgBr electrode very much like an intrinsic semiconductor. The <I>E</I><SUB>fb</SUB> values for the AgCl and AgBr electrodes change cathodically in electrolyte solutions with Cl<SUP>−</SUP> and Br<SUP>−</SUP> ions, respectively, but not with H<SUP>+</SUP> or OH<SUP>−</SUP> ions. This seems to be associated with the Ag<SUP>+</SUP> ion effect in spectral sensitization. It is concluded that the Ag<SUP>+</SUP> ion effect arises from a downward shift of the band edge of silver halides.
- 公益社団法人 日本化学会の論文
著者
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Honda Kenichi
Department Of Synthetic Chemistry Faculty Of Engineering The University Of Tokyo
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Fujishima Akira
Department Of Applied Chemistry Faculty Of Engineering The University Of Tokyo
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WATANABE Tadashi
Department of Environmental Science and Resources, Faculty of Agriculture, Tokyo-Noko- University
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Sumi Seiichi
Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo
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