| 摘要 |
A planar photoelectrochemical sensing structure includes a thin, porous layer of photoactive semiconductor powder material deposited on an electronically conducting catalyst film which has been fabricated in two regions separated by a narrow stripe. Using incident light absorbed by the semiconductor, the structure is suited to photosensitizing redox reactions of chemical species introduced to the structure in an aqueous gas-phase environment. If photocarriers generated by the incident light are prevented from reaching one of the catalyst regions, for example by use of a light shield, then an EMF develops between the two catalyst regions. The magnitude of the EMF varies with the concentration of one of the gaseous reactants and thus provides a measure of the concentration.
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