TiO2 基光催化 CO2 还原研究进展.

The search for alternatives to fossil fuels has received a great deal of attention based on the urgency of reducing CO2 levels in the atmosphere and the demand for energy at this stage. Solar energy is the world's most abundant renewable energy source, and photocatalysis is a sunlight-driven chemical reaction process carried out on the surface of the photocatalyst. The realization of the carbon cycle is an urgent need for the development of human society. Photocatalysis has the advantages of low energy consumption and mild reaction conditions, and realizing the resource utilization of CO2 by simulating natural photosynthesis, which is one of the most promising means to solve this problem, and is of great significance for realizing carbon neutrality. The central issue in the case is the development of efficient, environmentally friendly and inexpensive catalysts. Titanium dioxide (TiO2 ) is favored in photocatalysis because of its high catalytic activity and excellent chemical stability. However, some bottlenecks still restrict the photocatalytic activity. Various methods have been tried to optimize the photocatalytic performance. This article summarizes the photocatalytic CO2 reduction based on TiO2 photocatalysts in recent years, which helps to comprehensively understand and grasp the research progress and trends in this field. This paper mainly discusses the mechanism of photocatalytic CO2 reduction, reaction system, and the research progress of TiO2-based catalysts in photocatalytic CO2 reduction. The active sites of TiO2-based photocatalysts are elaborated, focusing on the applications of titanium-oxo clusters, the construction of Lewis acid-base pairs, the establishment of heterojunctions, and the modulation of surface wettability. These strategies can not only increase the effective active sites on the catalyst surface, but also effectively enhance the separation efficiency of electron-hole pairs, so as to improve the photocatalytic CO2 reduction performance. Finally, the future opportunities and challenges in this field are prospected. [ABSTRACT FROM AUTHOR]