Abstract
A photo-active anode involving lanthanum chromite has been studied. The electrodes were made by firing lanthanum and chromium oxides, or salts which are converted upon heating to the oxide, in a paste of citric acid on a titanium oxide base. The anodic photo currents obtained were around four times greater than on an TiO 2 single crystal in the same potential region on a conventional scale. The photoelectrochemical spectrum showed a pronounced and characteristic peak which differed markedly in wave length region from that on TiO 2. The efficiency of conversion of solar light at a LaCrO 3-TiO 2 electrode is at least one order of magnitude greater than on TiO 2. Hence, the situation for photo-assisted electrolysis is improved. In self-generating photo-electrolysis cells in solar light, the expected efficiency of conversion is calculated to be about one order of magnitude more than the hitherto most efficient couple, GaP-TiO 2. The efficiency of hydrogen production from solar light is expected to be about 1.8% (up from 0.2175%), but the implication for the use of transition metal oxides for photo anodes is encouraging.
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