Photocatalysis under thermally shifted bandgap
Photocatalysis under thermally shifted bandgap
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DOI：
10.1016/j.apcata.2022.118772
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发表时间：
2022-07
期刊：
影响因子：
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通讯作者：
Yohei Cho;Akira Yamaguchi;Aaron Sinaga;Yue Yang;M. Miyauchi
中科院分区：
文献类型：
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作者：
Yohei Cho;Akira Yamaguchi;Aaron Sinaga;Yue Yang;M. Miyauchi
光的吸收会引起半导体的温度升高，因此应注意半导体的热效应。本研究在室温及升温条件下，探讨半导体光触媒之能带及作用光谱。在整个光电化学、气相和液相光催化实验中，我们发现，当温度从室温升高到75或90 °C时，不仅源于二氧化钛（TiO 2）的带隙激发的吸收，而且光催化反应的作用光谱也向较低能量移动。这种现象意味着，当带结构被热能“修改”时，光催化反应可以由具有较低能量的光驱动。这一结果不仅使我们能够利用更多的入射光子，而且还可以控制还原或氧化能力。因此，这种金属氧化物半导体的“热改性”为工程半导体光催化剂的能带提供了一种新的策略。
The heat effect on photocatalysis should be taken care because light absorption causes a temperature rise in semiconductor. In this research, bandgaps and action spectra of semiconductor photocatalysts were investigated at room and increased temperature. Throughout the photoelectrochemical, gas-phase, and liquid-phase photocatalysis experiments, we found that when the temperature is increased from room temperature to 75 or 90 °C, not only the absorption originating from the bandgap excitation of titanium dioxide (TiO2) but also the action spectrum of the photocatalytic reaction shifted to lower energy. This phenomenon implies that the photocatalytic reaction can be driven by light with lower energy when the band structure is ‘modified’ by heat energy. This result not only enables us to utilize more incident photons but also to control the reduction or oxidation ability. Thus, this ‘thermal modification’ of metal oxide semiconductors provides a new strategy for engineering the bands of semiconductor photocatalysts.