Abstract
The photoreduction of oxygen on PcH 2 thin films deposited on gold substrates has been investigated in KOH solutions in the presence of known additional amounts of H 2O 2. Under steady-state conditions on a rotating disc, a kinetic current can be determined which appears to be a function of the film thickness. The power of the generator is limited by an internal resistance which is due mainly to the film/electrolyte interface. Impedance measurements were performed using pulse techniques. Transient responses are due mainly to previously absorbed oxygen in the film. The effect of KOH concentration is interpreted through a simple model electron/hole recombination being a function of the concentration of oxygen in the film, both increasing with the pH.
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