Carbon dots-based 0D/2D heterostructures and their photocatalytic applications
Carbon dots(C-Dots)have received much attention in photocatalyst design and mechanism stud-ies due to their precise size control,unique photoelectrical properties,and abundant surface-active sites,but their catalytic performance is still limited by issues such as severe charge recombination,agglomera-tion,and poor stability,which mainly stem from the small size and high surface area.A major solution to these problems is loading the zero-dimensional(0D)C-Dots onto ultrathin two-dimensional(2D)nanoshe-ets to form 0D/2D nanocomposites.In this review,we systematically introduce the progress on the design and construction of 0D/2D heterojunction photocatalysts based on C-Dots,and their applications across different photocatalytic reactions,such as hydrogen production,carbon dioxide reduction,and hydrogen peroxide synthesis.We also discuss the key role of various types of 0D/2D heterojunctions according to different photocatalytic mechanisms and corresponding promoting strategies for enhancing the catalytic ac-tivity,accelerating charge transfer,and coupling different sites for the surface oxidation/reduction reac-tions.Finally,the challenges and future research directions associated with these systems are discussed.
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