We have synthesized and characterized a series of TiO₂(B)/anatase photocatalysts in the form of nanobelts. Spectroelectrochemical measurements (SE-DRS) revealed the staggered type of the band alignment for anatase and TiO₂(B) composites, with higher potentials of band edges for anatase. The photoactivity of the materials and photocurrent generation have been studied. Similarly to anatase/rutile composites, a synergistic effect of the presence of two phases has been observed for TiO₂(B)/anatase (2:98) material in the reaction of hydroxyl radicals generation. In the case of hydrogen generation reaction, such synergy was not noticed, likewise in the case of IPCE measurements. On the other hand, singlet oxygen generation takes place preferably at TiO₂(B), despite worse oxygen adsorption at this polymorph. Our findings shed new light on the general understanding of the photocatalytic activity of TiO₂(B) and its composites with anatase. Unlike suggested elsewhere, instead of facilitating hydrogen evolution reaction, TiO₂(B), as a minor admixture, should rather be considered as a component of photocatalysts optimized for oxidation reactions involving hydroxyl radicals.

我们已经合成和表征了一系列的纳米带形式的TiO ₂（B）/锐钛矿型光催化剂。光谱电化学测量（SE-DRS）揭示了锐钛矿和TiO ₂（B）复合材料的能带排列交错类型，锐钛矿的带边缘电位更高。已经研究了材料的光活性和光电流产生。与锐钛矿/金红石复合材料相似，在羟基自由基的生成反应中，对于TiO ₂（B）/锐钛矿（2:98）材料，已观察到存在两相的协同效应。在氢发生反应的情况下，与在IPCE测量的情况下一样，没有注意到这种协同作用。另一方面，单线态氧的产生优选在TiO 2处发生。_如图2（B）所示，尽管在该多晶型物上氧吸附较差。我们的发现为对TiO ₂（B）及其锐钛矿型复合材料的光催化活性的一般理解提供了新的思路。与其他地方所建议的不同，TiO ₂（B）作为辅助混合物，而不是促进氢的释放反应，而应被认为是为涉及羟基自由基的氧化反应而优化的光催化剂成分。