The sufficient supply of energy remains one of the most important challenges for a sustainable development of our society. In this respect, capturing sunlight energy by photocatalytic reduction of the greenhouse gas CO₂ is interesting. In a more general way, the smart use of CO₂ as C₁-feedstock and its conversion to valuable carbon-based materials and energy sources can be the basis to establish a closed-CO₂ cycle. This review summarizes recent advances in photocatalytic utilization of CO₂ catalyzed by most prominent TiO₂ based systems. The influences of different structures (i.e. crystal phase, morphology, vacancies, and defects), co-catalysts, and reaction conditions onto the catalyst performance are specifically highlighted. Furthermore, the reader attention is drawn to the oxidation counter reaction, which has been often neglected in the past.

充足的能源供应仍然是我们社会可持续发展的最重要挑战之一。在这方面，通过光催化还原温室气体CO ₂捕获阳光能量是令人关注的。以更一般的方式，将CO ₂巧妙地用作C ₁原料并将其转化为有价值的碳基材料和能源可以成为建立封闭式CO ₂循环的基础。这篇综述总结了最著名的TiO ₂催化光催化利用CO _2的最新进展。基于系统。特别强调了不同结构（即晶相，形态，空位和缺陷），助催化剂和反应条件对催化剂性能的影响。此外，引起读者注意的是过去常常被忽略的氧化反反应。