Titanium dioxide (TiO₂) is regarded as an important prototype photocatalytic material for several decades. The charge carrier kinetics determines the photocatalytic properties of TiO₂ materials; this is found to be greatly dependent on electronic structures. It has been revealed that the intrinsic intermediate gap states (intrinsic GSs) play a significant role in charge carrier kinetics that drive the photocatalytic processes of TiO₂ materials, which are not well summarized until now. Motivated by this thought, the purpose of this review focuses on physiochemical science of the intrinsic GSs of TiO₂ materials and their important role in charge carrier kinetics. We first give a summary on the chemical resources of the intrinsic GSs in TiO₂ and their physiochemical nature. Their general energy distribution, charge carrier population, and the associated thermodynamic properties are also elaborated from an overall viewpoint. We further carefully summarize and compare the experimental studies on the energy and the density distribution of the intrinsic GSs and discuss the associated chemical resources and charge carrier localizations. Trapping is the dominant function of intrinsic GSs in the charge carrier kinetics of TiO₂ materials. The significant effect of trapping on the transport, recombination, and interfacial transfer of charge carriers are also comprehensive summarized. Furthermore, the effects of charge carrier kinetics on photocatalytic performances are also discussed to some extents. Because of the importance of intrinsic GSs in modulating charge carrier kinetics, it is expected to increase the photocatalytic activity by engineering the intrinsic GSs, not only for TiO₂ materials, but also for the other semiconductor photocatalysts.

几十年来，二氧化钛（TiO ₂）被认为是重要的原型光催化材料。载流子动力学决定了TiO ₂材料的光催化性能。发现这很大程度上取决于电子结构。已经发现，固有的中间间隙态（本征GSs）在驱动TiO ₂材料的光催化过程的电荷载流子动力学中起着重要作用，到目前为止还没有很好地总结。受此思想的激励，本综述的重点是TiO ₂内在GS的物理化学科学。材料及其在电荷载流子动力学中的重要作用。首先，我们对TiO _2中内在GS的化学资源及其理化性质进行了概述。从总的观点出发，还详细说明了它们的一般能量分布，电荷载流子总数以及相关的热力学性质。我们将进一步仔细总结和比较本征GS的能量和密度分布的实验研究，并讨论相关的化学资源和电荷载流子的位置。陷获是本征GS在TiO ₂电荷载流子动力学中的主要功能。材料。陷阱对电荷载流子的迁移，重组和界面转移的重要影响也得到了全面总结。此外，在一定程度上也讨论了载流子动力学对光催化性能的影响。由于本征GS在调节电荷载流子动力学中的重要性，因此有望通过工程改造本征GS来提高光催化活性，这不仅适用于TiO ₂材料，而且适用于其他半导体光催化剂。