Abstract
BiCl3-solutions in high-boiling alcohols show a remarkable light-sensitivity accompanied by a photochromic effect as well as a substantial electrochemical voltage. Moreover, both effects are reversible on a minute's timescale. Light exposure of transparent, colorless BiCl3-solutions in diethylene glycol leads to an intensive blackening. This photochromic effect is validated as a photocatalytic reduction of Bi3+ to Bi0 nanoparticles as well as an oxidation of the alcoholic solvent. The black suspension can be reversed to a clear solution by contact with air, and thus re-oxidation and dissolution of the nanoparticles. Reversible light absorption/blackening and air-oxidation/decolorization are quantified by UV-Vis spectra. In addition to the photochromic effect, the light-induced redox-process allows a simple electrochemical cell to be established. Herein, a significant electrochemical voltage is measured that indicates the intensity as well as the incidence of the incoming light.
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