Abstract

The surface states at the semiconductor electrolyte interface under illumination for the electrochemical reduction of carbon dioxide has been determined to be 1014 cm-2. Surface states are induced by adsorbed ions and act as faradaic mediators for the photoelectrochemical reduction of carbon dioxide. It is shown that CO2 is adsorbed on platinum and adsorbed CO-2 is the intermediate radical. The rate determining step involves further reduction of CO-2 to give the final products. Adsorption of NH+4 ions on p-GaP has been studied using FTIRRAS. At cathodic potentials adsorbed ammonium ions are reduced and the reduced ammonium radical desorbs. The structure of adsorbed ammonium is investigated.

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