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The photocurrent-potential curves and the photoluminescence (PL) peak at 840 nm for n-TiO 2 electrodes, in which the n-type semiconductivity is obtained by hydrogen reduction at 550-700°C are investigated in various electrolyte solutions. It is found that a freshly prepared n-TiO 2 electrode shows a weak photocurrent and no PL, but both the photocurrent and the PL intensity increase...
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