Abstract
Ag@Cr/Ga2O3 is one of the most active photocatalysts for the photocatalytic conversion of CO2 by H2O; however, the formation rate of CO steadily decreases with increasing photoirradiation time. In this study, the reasons for the decreasing CO evolution were investigated in detail. The formation rate of CO was strongly dependent on the amount of Cr3+ in Ag@Cr/Ga2O3. Dissolution of Cr3+ during the reaction led to a decrease in the thickness of the Cr(OH)3·xH2O shell. The Cr3+ in Ag@Cr/Ga2O3 was oxidized to dissolvable Cr6+ during the photocatalytic conversion of CO2 in a NaHCO3 aqueous solution under UV light irradiation. NaHCO3 as an additive facilitated the dissolution of Cr3+.
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