Abstract Photocatalysis shows great promise in the field of solar energy conversion. One of the reasons for this is because it promotes the development of multi-field-coupled catalysis. In order to explore the principles of multi-field-coupled catalytic reactions, an in situ multi-field-coupled characterization technique is required. In this study, we obtained hydrogenated ST-01 TiO2 and observed enhanced catalytic activity by thermal coupled photocatalysis. In situ photoconductivity was employed to understand the activity enhancement. The effects of the reaction temperature, reaction atmosphere, and oxygen vacancy (Ov) on the photoconductivity of TiO2 were studied. After coupling thermal into photoconductivity measurement, highly active Ov-TiO2 displayed rapid decay of photoconductivity in a CO2 atmosphere and slow decay of photoconductivity in a N2 atmosphere. These phenomena revealed that photothermal coupling assisted the detrapping of electrons at the Ov surface and promoted electron transfer to CO2, which clearly explained the high photothermal catalytic activity of Ov-TiO2. This study demonstrated that photoconductivity is a useful tool to help understand photothermal catalytic phenomena.

中文翻译：

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热耦合光电导作为了解 CO2 光热催化还原的工具

摘要 光催化在太阳能转换领域具有广阔的应用前景。其原因之一是因为它促进了多场耦合催化的发展。为了探索多场耦合催化反应的原理，需要一种原位多场耦合表征技术。在这项研究中，我们获得了氢化 ST-01 TiO2，并通过热耦合光催化观察到催化活性增强。采用原位光电导来了解活性增强。研究了反应温度、反应气氛和氧空位（Ov）对TiO2光电导率的影响。在将热耦合到光电导测量中后，高活性的 Ov-TiO2 在 CO2 气氛中显示出光电导率的快速衰减，而在 N2 气氛中显示出光电导率的缓慢衰减。这些现象表明光热耦合有助于在 Ov 表面释放电子并促进电子转移到 CO2，这清楚地解释了 Ov-TiO2 的高光热催化活性。这项研究表明，光电导是帮助理解光热催化现象的有用工具。