Time-Resolved Infrared Absorption Study of NaTaO3 Photocatalysts Doped with Alkali Earth Metals
Time-Resolved Infrared Absorption Study of NaTaO3 Photocatalysts Doped with Alkali Earth Metals
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DOI：
10.1021/jp903142n
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发表时间：
2009-07
影响因子：
3.7
通讯作者：
M. Maruyama;Akihide Iwase;H. Kato;A. Kudo;H. Onishi
中科院分区：
文献类型：
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作者：
M. Maruyama;Akihide Iwase;H. Kato;A. Kudo;H. Onishi
采用时间分辨红外吸收法观察了掺Ca、Sr、Ba和La的NaTaO3光催化剂的电子空穴复合动力学。将重组速率与水裂解反应中紫外光衍生的H2产率进行比较，以估计电子到H2的转化效率。转换效率对光催化剂表面纳米形貌敏感。未掺杂和0.5 mol % sr掺杂光催化剂的特别高的效率与光催化剂颗粒上暴露的平坦（100）晶体表面有关。通过对复合速率的动力学模拟，发现掺杂限制了空穴的迁移率。
Electron−hole recombination kinetics was observed in NaTaO3 photocatalysts doped with Ca, Sr, Ba, and La using time-resolved infrared absorption. The recombination rate was compared with the ultraviolet light-derived H2 production rate in the water splitting reaction to estimate the electron-to-H2 conversion efficiency. The conversion efficiency was sensitive to the nanometer-scale topography of the photocatalyst surface. The particularly high efficiency on the nondoped and 0.5 mol % Sr-doped photocatalysts was related to the flat (100) crystalline surfaces exposed on the photocatalyst particles. The mobility of holes was suggested to be restricted by doping on the basis of a kinetic simulation of the recombination rate.