Abstract
Overall solar energy conversion efficiencies of at least 0.8%, somewhat greater than those previously reported, have been obtained in the photocatalytic production of hydrogen using TiO 2 semiconductor electrodes prepared by heat-treatment of titanium metal foils. A shift in the threshold frequency for hydrogen evolution toward energies slightly lower than the 3.02 eV bandgap of TiO 2 has been observed for some of these electrodes. This result supports the possibility of utilizing a greater portion of the solar spectrum, thereby increasing overall conversion efficiency even further. A tentative explanation of this shift involves the presence of mixed phases of the titanium-oxygen system (Magneli phases) in the semiconducting film. An outline of the work in progress is given.
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