TiO2基催化剂还原CO2研究进展

能源危机和环境污染是当今世界发展面临的两大挑战,如何有效缓解煤、石油等不可再生化石资源过度消耗所引发的能源危机,以及由此造成CO₂过量排放引起的温室效应问题,是当前人类发展亟待解决的重大科学问题之一。基于此,本文综述了近年来以TiO₂为光催化剂,以绿色、清洁的太阳光能催化还原CO₂成低价态含碳燃料(如CH₄、CH₃OH、HCHO、HCOOH、C₂H₅OH等)研究进展。在TiO₂光还原CO₂机理基础上,对元素掺杂、半导体复合与染料敏化、高活性晶面调控、低维纳米结构设计、助催化剂、Z型结构设计和单原子催化等方法来提高光还原CO₂反应效率和选择性进行分析,并指出目前研究存在的关键问题和未来CO₂光还原的发展方向。

Research progress of CO2 reduction via TiO2 based catalysts

Currently,energy crisis and environmental pollution are the two major challenges for our developing world.How to effectively alleviate the energy crisis caused by over-consumption of non-renewable fossil resources such as coal and oil,as well as the greenhouse effect caused by excessive carbon emissions,is one of the major scientific problems which is urgently required to resolve in the present development of human society.Herein,the advanced photocatalytic technology is utilized to reduce CO₂ to low-cost carbon-containing fuels(such as CH₄,CH₃OH,HCOOH, HCHO, C₂H₅OH,etc.) over catalysts photoexcited under light.Based on the photoreduction,the recent development,key problems and future prospects of photocatalytic CO₂ on TiO₂-based on catalysts are reviewed,including elements doping,TiO₂ composites and dye sensitization,high activity crystal surface regulation,cocatalyst,single(double)-atom catalysis etc to improve CO₂ conversion and selectivity.