Cu Sites Synergistic Double Heterojunction Engineering for Enhancing CO₂ Photoreduction

Abstract

The weak adsorption capacity of active sites for CO₂ and the rapid recombination of photogenerated charges are the key to limiting the photocatalytic reduction activity. How to construct a system to achieve strong adsorption of CO₂ and rapid charge separation is particularly important. Based on this, ZnS/Bi₂S₃/CuS composite photocatalyst with double heterojunction structure was constructed by a simple in-situ hydrothermal method. The interface charge contact of the double heterojunction structure formed a built-in electric field, which effectively inhibited the recombination of electron holes, thereby promoting charge separation. Electrons were enriched on CuS, and the strong adsorption energy of Cu sites to CO₂ can be used to rapidly react and improve the photocatalytic activity. Compared with the single substance, the performance of CH₄ and CO was improved by up to 4 and 3.26 times. Density functional theory (DFT) and in situ infrared proved the photocatalytic reaction mechanism.

Keywords

Photocatalytic CO₂ reduction / Double heterojunction / Adsorption energy / Charge separation

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Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH