Z型异质结光催化还原CO_(2)研究进展

RESEARCH PROGRESS OF Z-SCHEME HETEROJUNCTION PHOTOCATALYTIC SYSTEMS FOR CO_(2) REDUCTION

Z型异质结(Z Scheme heterojunctions)可将电子和空穴在不同半导体材料上实现空间分离,具有光谱响应宽、电荷分离效率高、氧化还原能力强、稳定性高等优势,在光催化CO_(2)还原(CO_(2) reduction reaction,CO_(2)RR)等应用中具有广阔前景,是未来光催化剂材料设计等领域的重点研究方向。综述了Z型异质结在光催化还原CO_(2)领域的研究进展,具体阐述了液相、全固态和直接型三代Z型异质结的电荷转移机制,分别讨论了各类Z型异质结光催化体系的优缺点,并结合CO_(2)RR原理总结了三类Z型异质结光催化剂在光催化CO_(2)RR领域的应用现状。指出未来高性能Z型异质结光催化剂设计及光催化还原CO_(2)研究应重点关注CO_(2)还原产物(特别是C_(2)及C_(2)+产物)的生成机理,深入研究Z型异质结中电荷转移机理,重视还原产物溯源、提高实验设计与反应结果评价的严谨性,同时应面向大规模工业化应用开展系统性研究。

Z-scheme heterojunctions separate photogenerated electrons and holes to different semiconductors,featuring broad spectrum response,high charge separation efficiency,strong redox capacity as well as high stability.Z-scheme heterojunctions have emerged as a powerful material to catalyze CO_(2) reduction reaction(CO_(2)RR)and have attracted much research effort in the field of photocatalysis.The recent research progress on Z-scheme photocatalytic systems for CO_(2) reduction is reviewed.Different charge transfer mechanisms in three types of Z-scheme heterojunctions(liquid-phase,all-solid-state and direct Z-scheme)are elaborated.Relative merits of different Z-scheme heterojunctions and their applications in CO_(2)RR are summarized.It is pointed out that in the future,more effort needs be devoted to investigate the generation mechanisms of photocatalytic CO_(2)RR products(especially C_(2) and C_(2)+products),to elucidate the charge transfer mechanisms in photocatalytic Z-scheme heterojunctions,to trace back to the origin of CO_(2)RR products,to improve experimental design and evaluation,and to conduct systematic researches for large-scale industrial trials.