摘要
碳点因其精确的尺寸控制、独特的光电性能和丰富的表面活性位点而在光催化剂设计和机理研究中受到广泛关注,但其催化性能仍受到严重电荷复合、团聚和稳定性差等问题的限制,这主要源于其尺寸小、表面积大.解决这些问题的一个主要方法是将零维(0D)碳点加载到超薄二维(2D)纳米片上,形成0D/2D纳米复合材料.本综述系统地介绍了基于碳点的0D/2D异质结光催化剂的设计和构筑方面的进展,以及它们在不同光催化反应中的应用,如制氢、二氧化碳还原和过氧化氢合成.我们还讨论了各种类型的0D/2D异质结所起的关键作用,根据不同的光催化机制以及相应的促进策略,以提高催化活性、加速电荷转移以及表面氧化/还原反应不同位点的耦合.最后,讨论了与这些系统相关的挑战以及未来的研究方向.
Abstract
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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