The use of stabilizers having negative charges such as polyacrylic acid for CdS microcrystals in aqueous solutions yielded selectively formate as a photoreduction product of CO2, while positively charged stabilizers such as polyethyleneimine worked well for selective production of CO. Furthermore, it was found that the rate of photo-induced reduction of carbon dioxide was influenced by the amount of charges of the stabilizers used.
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Inoue et al. (1994) studied this question.
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