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As an extremely promising new class of materials, MXenes (two-dimensional layered materials) have attracted much interest and become a research hotspot in many fields. Owing to the typical layered structure, excellent electronic performance, it can be used as co-catalysts to recombine other photocatalytic materials to enhance the separation of photo-generated charges, inhibit the rapid recombination of charges, and finally convert solar energy into chemical energy. MXenes, which exhibit extraordinary catalytic activity in photocatalytic reactions, are increasingly being widely used as co-catalysts. This article summarizes and discusses two photocatalytic reactions with MXenes as co-catalysts, the dehydrogenation reaction (HER) and the CO2 reduction reaction (CO2RR), as well as their physical and chemical properties, preparation and synthesis methods, and the latest research progress. Summarized related applications and photocatalysis principles. Finally, the prospects and expectations of MXenes in photocatalytic applications are presented.

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