Research progress on structural design of photocatalysts for diluted carbon dioxide reduction
Photocatalytic conversion of carbon dioxide(CO2)into value-added chemicals and fuels is one of the promising strategies for mitigating global warming and achieving the goal of carbon neutrality.In order to promote the development of this field,the design and synthesis of efficient photocatalysts is critical.Compared with previous studies,low-concentration CO2 photoreduction received intensive research in the past five years.Hence,this review explores the latest advancements in structure design of photocatalyst for diluted CO2 reduction.Firstly,the mechanism and pathways of CO2 photoreduction as well as their influencing factors are briefly introduced.Secondly,the structural characteristics and regulation strategies are reviewed in term of four types of photocatalyst,including metal-organic framework,covalent organic framework,metal oxides,and single atom photocatalysts.The effects of CO2 adsorption and enrichment,electron-hole separation and migration and surface site activity on the efficiency and selectivity were deeply investigated.Finally,in response to the opportunities and challenges of photocatalyst for efficient diluted CO2 reduction,including product selectivity,conversion efficiency and the synthesis of high-value C2 products,we proposed relevant solutions and strategies regarding catalyst structure design.
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