Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, PR China; School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China.
Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, PR China; Swagelok Center for Surface Analysis of Materials, Case Western Reserve University, Cleveland, OH 44106, United States.
J Colloid Interface Sci. 2019 Mar 15;539:194-202. doi: 10.1016/j.jcis.2018.12.022. Epub 2018 Dec 7.
TiO microsphere with tunable pore and chamber size are prepared by a simple solventhermal method and used as catalyst for the photocatalytic CO reduction. It is found that the hollow microsphere with relative lower surface area of 73.8 m g exhibits increased pore size of 18.1 nm and cavity structure, leading to higher CO diffusion coefficient of 5.40 × 10 cm s compared with the solid and yolk/shell microspheres. Therefore, the hollow microsphere possesses more accessible sites for CO adsorption, which finally gives rise to the enhanced CO production rate of 10.9 ± 0.7 μmol g h under simulated sunlight, which is respectively 1.6 and 1.4 times higher than that of solid and yolk/shell microspheres. Electron dynamic study further demonstrates that hollow microsphere shows the highest photocurrent density and the lowest charge recombination among three microspheres structure, which is attributed to the swift CO diffusion providing fresh CO molecules to rapidly scavenge the photo-generated electrons and finally leading to the excellence catalytic reduction performances. This method could be adopted as a general strategy to prepare high performance TiO catalysts with desirable structural qualities for the photocatalytic CO reduction under nature sunlight.
通过简单的溶剂热法制备了具有可调孔和腔室尺寸的 TiO 微球，并将其用作光催化 CO 还原的催化剂。研究发现，相对较低的比表面积为 73.8 m²/g 的空心微球具有较大的孔尺寸（18.1 nm）和腔结构，导致 CO 扩散系数为 5.40×10cm²/s，与实心和蛋黄/壳微球相比有所提高。因此，空心微球具有更多的 CO 吸附活性位，从而在模拟太阳光下产生更高的 CO 生成速率（10.9±0.7 μmol g h），分别是实心和蛋黄/壳微球的 1.6 倍和 1.4 倍。电子动力学研究进一步表明，空心微球在三种微球结构中表现出最高的光电流密度和最低的电荷复合率，这归因于 CO 的快速扩散，为迅速捕获光生电子提供了新鲜的 CO 分子，最终导致了出色的催化还原性能。这种方法可以作为一种通用策略，用于制备具有理想结构质量的高性能 TiO 催化剂，以实现自然光下的 CO 光催化还原。
