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Ammonia was formed photocatalytically from an aqueous solution of azide ion by using illuminated Pt/TiO2 semiconductor powder. The reaction products, NH3, N2, and small amounts of N2O and NO3−, were detected. Hydrogen, O2 and N2H4 were not formed in the primary reaction products. From these results, together with photoelectrochemical measurements, a mechanism of the ammonia formation from azide ion and water is presented.

The effect of electrochemical doping on the photoelectrochemical properties was studied for p-type semiconducting trans-polyacetylene. The magnitude of photocurrent, the response spectrum, the electrode capacitance and resistance were measured and discussed in terms of the effect of the doping.

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