Abstract
The H + concentration change was monitored near an electrode surface through an electrolysis using a slab optical waveguide technique. Indium tin oxide transparent electrode modified by porous insulating polymer to which methyl red was covalently immobilized was used as a guiding layer, and the absorbance change of the polymer film was monitored. H + generation at the vicinity of the electrode through the oxidation of ascorbic acid could be monitored by this technique.
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