Effect of band structure on the hot-electron transfer over Au photosensitized brookite TiO2

Effect of band structure on the hot-electron transfer over Au photosensitized brookite TiO2
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能带结构对 Au 光敏板钛矿 TiO2 热电子转移的影响

DOI:
10.1039/c5cp06874f
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发表时间:
2016
影响因子:
3.3
通讯作者:
Ye Jinhua
Ye Jinhua
中科院分区:
化学2区
文献类型:
--
作者:
Zhao Ming;Xu Hua;Ouyang Shuxin;Li Dewang;Meng Xianguang;Ye Jinhua

文献摘要

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Au光敏化可赋予TiO2可见光驱动的光催化性能。在此,我们发现,以具有可调电子能带结构的面优化板钛矿型TiO2为衬底,强烈的可见光激发Au会导致热电子的积累,从而使Au的EF负移,降低肖特基势垒,从而确保它们连续注入到TiO2的CB中,在这种情况下,具有更高还原电位的热电子将导致上级光催化活性。
Au photosensitization can endow TiO2 visible-light-driven photocatalytic properties. Herein, via facet-optimized brookite TiO2 with tunable electronic band structures as the substrate, we found that intense visible light excitation of Au will result in the accumulation of hot-electrons, which will negatively shift the EF of Au and lower the Schottky barrier, thus ensuring their consecutive injections into the CB of TiO2; in this case, hot-electrons with more reduction potential will lead to superior photocatalytic activity.