Well-dispersed fine and stable colloidal platinum is easily prepared by refluxing the solution of chloroplatinic acid in alcohol (and water) in the presence of poly(vinyl alcohol) or polyvinylpyrrolidone under air. The catalytic activity of the colloidal platinum for light-induced hydrogen evolution from water depends on the particle size of the platinum indicating the maximum activity for the colloid of about 30 Å in diameter.
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Toshima et al. (1981) studied this question.
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