Synergistical Dual Strategies Based on in Situ-Converted Heterojunction and Reduction-Induced Surface Oxygen Vacancy for Enhanced Photoelectrochemical Performance of TiO2
Synergistical Dual Strategies Based on in Situ-Converted Heterojunction and Reduction-Induced Surface Oxygen Vacancy for Enhanced Photoelectrochemical Performance of TiO2
复制标题
基于原位转换异质结和还原诱导表面氧空位的协同双重策略增强 TiO2 的光电化学性能
DOI：
10.1021/acsami.9b12537
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发表时间：
2019-10-09
影响因子：
9.5
通讯作者：
Yan, Xiaohong
中科院分区：
文献类型：
--
作者：
He, Yanfang;Wang, Peipei;Yan, Xiaohong
确定改善充分表面反应辅助的电荷分离性能的有效方法是开发高效的TiO2光阳极的重大挑战。在这里，我们报告了密切接触异质结和表面氧空位之间的结构协同策略，以显着提高电荷分离效率和TIO2纳米线（NWS）在PEC水分中的电荷注入效率。为了完成这项任务，首先是由原位转换构建的TIO2/SRTIO3（TIO2/STO）异构型，导致界面之间紧密接触，从而促进了光诱导的电荷载体的分离，与TIO2相比，电荷分离效率提高了107％。在SRTIO3涂层表面建立的无定形层之后，所得的TIO2/SRTIO3/R-SRTIO3（TIO2/STO/R-STO）提高了光电极的光吸收特性，并提高了对氢氧化物的压力的增强功能，从而使氢氧化物离子均与6.3％相比，将其与6.3％相比。这种增强电荷分离和增强表面反应的互补修饰表明，可以改善一种光阳极的光电化学（PEC）性能的重要能力，这对于包括光催化和PEC二氧化碳减少在内的其他领域可能具有启发性。
Identifying effective means to improve the charge separation performance assisted by adequate surface reaction represents a significant challenge for developing a highly efficient TiO2 photoanode. Here we report a structural synergistic strategy between a close contact heterojunction and a surface oxygen vacancy to significantly boost the charge separation efficiency and charge injection efficiency of TiO2 nanowires (NWs) in PEC water splitting. To accomplish this task, a TiO2/SrTiO3 (TiO2/STO) heterojunction was first constructed by in situ conversion, resulting in close contact between interface, promoting separation of the photoinduced charge carriers, which increased charge separation efficiency by 107% compared to TiO2. After the amorphous layer established on the surface of the SrTiO3 coating, the resulting TiO2/SrTiO3/r-SrTiO3 (TiO2/STO/r-STO) improved the light absorption property of the photoelectrodes and boosted the ability to adsorb the reactant hydroxide ions, resulting in charge injection efficiency improvement by 67.3% compared with pure TiO2. This complementary modification for enhancing charge separation and boosting the surface reaction demonstrates a significant capacity to improve the photoelectrochemical (PEC) performance of one photoanode, which could be instructive for other fields including photocatalysis and PEC carbon dioxide reduction.