Electric Field Manipulation for Improved Rates of Photocatalysis by Mesoporous TiO 2
Electric Field Manipulation for Improved Rates of Photocatalysis by Mesoporous TiO 2
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电场调控提高介孔 TiO 2 光催化速率
DOI：
10.1021/acs.jpcc.1c09020
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Seebauer, Edmund G.
中科院分区：
文献类型：
--
作者：
Huang, Qilong;Seebauer, Edmund G.
这项工作表明了一个概念，通过操纵附近的标称自由表面的内置电场，提高介孔薄膜的半导体氧化物纳米粒子的介电常数。反应速率通过供体浓度和表面电势的组合而增加，所述供体浓度和表面电势产生宽的空间电荷宽度和相应的由内建场包围的大区域。电场将薄膜深处产生的少数载流子拉向化学反应物最集中的标称表面。在亚甲基蓝水溶液的光氧化由TiO2，优化的参数增加了近3倍的速率。这个概念应该扩展到许多光催化材料和反应。
This work demonstrates a concept for improving rates of photocatalysis by mesoporous thin films of semiconducting oxide nanoparticles through manipulating the built-in electric field near the nominal free surface. The reaction rate increases via combinations of donor concentration and surface potential that yield wide space charge widths and correspondingly large regions encompassed by the built-in field. The field draws minority carriers generated deep within the film toward the nominal surface where the chemical reactant is most concentrated. In the photo-oxidation of aqueous methylene blue by anatase TiO2, optimization of the parameters increases the rate by nearly a factor of 3. The concept should extend to many photocatalytic materials and reactions.