Chemo-mechanical strain effects on band engineering of the TiO2 photocatalyst for increasing the water splitting activity
Chemo-mechanical strain effects on band engineering of the TiO2 photocatalyst for increasing the water splitting activity
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DOI：
10.1039/c9ta11048h
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发表时间：
2020-01
影响因子：
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通讯作者：
Yoonyoung Kim;Motonori Watanabe;J. Matsuda;A. Staykov;H. Kusaba;Atsushi Takagaki;T. Akbay;T. Ishihara
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文献类型：
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作者：
Yoonyoung Kim;Motonori Watanabe;J. Matsuda;A. Staykov;H. Kusaba;Atsushi Takagaki;T. Akbay;T. Ishihara
光催化分解水是利用太阳能生产有用化学品的最理想系统。为了提高TiO 2光催化剂的光催化活性，人们进行了许多尝试，例如负载助催化剂和掺杂剂，以及引入氧空位。应变效应也引起了人们的极大兴趣，以增加体氧化物中的电荷迁移率。在这里，我们报告的有效性，拉伸应变稳定的二氧化钛在高温下，并增加了光催化活性的电荷分离与一个独特的混合相结构的增加。放电等离子体烧结（SPS）处理后，由于表面积的减少，TiO 2上的H2形成速率降低;然而，用Au分散体进行SPS处理显著增加了H2形成速率，使其高于负载有Au的市售P-25 TiO 2（无SPS处理）。O2的形成速率也增加了TiO 2的应变效应。此外，应变效应是有效的可见光敏感性的TiO 2。
Photocatalytic water splitting is the most ideal system to harvest solar energy for the production of useful chemicals. There have been many attempts to increase the photocatalytic activity of the TiO2 photocatalyst, such as loading co-catalysts and dopants, and the introduction of oxygen vacancies. Strain effects have also attracted much interest to increase the charge mobility in bulk oxide. Here, we report on the effectiveness of tensile strain in stabilizing the anatase phase of TiO2 at high temperature and increasing the photocatalytic activity by an increase in the charge separation with a unique mixed phase structure. The rate of H2 formation over TiO2 was decreased upon spark plasma sintering (SPS) treatment because of a decrease in the surface area; however, SPS treatment with Au dispersion significantly increased the H2 formation rate to higher than that over commercially available P-25 TiO2 (no SPS treatment) loaded with Au. The O2 formation rate was also increased by strain effects in TiO2. Furthermore, strain effects were effective for visible light sensitivity on TiO2.