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Intrinsic nature of photocatalysis by comparing with electrochemistry
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020/03/18 , DOI: 10.1039/d0cp00771d Yoshio Nosaka 1, 2, 3, 4 , Atsuko Y. Nosaka 1, 2, 3, 4
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020/03/18 , DOI: 10.1039/d0cp00771d Yoshio Nosaka 1, 2, 3, 4 , Atsuko Y. Nosaka 1, 2, 3, 4
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Photocatalysis has been gathering much attention because of the unique applications of photoenergy for environmental cleaning and solar fuel production. Electron transfer (ET) at the solid–liquid interface, which initiates photocatalytic reactions, has been the subject of electrochemistry, and hence the reactions are often analyzed in terms of electrochemistry. However, how extensively the concept of electrochemistry can be incorporated has not been discussed so far. In this report, by comparing with electrochemistry, the intrinsic nature of photocatalysis is disclosed and the limitation of the use of the concept of electrochemistry was pointed out. The electric potential near the photocatalyst surface was calculated and visualized, showing a potential gradient similar to that at the electrode surface but localized near the positive hole. Since the frequency of the ET at the photocatalyst surface is limited by the photon absorption, the investigation of photocatalysis in terms of energy states and kinetics should be different from those for electrochemistry. Since semiconductor photocatalysts are not wired to the electric source, the estimation of energy band positions may be altered, which was actually discussed in terms of the band alignments of anatase and rutile TiO2 crystals.
中文翻译：
光催化的内在性质与电化学比较
由于光能在环境清洁和太阳能生产中的独特应用，光催化一直备受关注。引发光催化反应的固液界面电子转移（ET）一直是电化学的主题，因此经常根据电化学来分析反应。但是，到目前为止，还没有讨论电化学概念的广泛应用。在本报告中，通过与电化学的比较，揭示了光催化的内在本质，并指出了使用电化学概念的局限性。计算并可视化了光催化剂表面附近的电势，显示出与电极表面相似但位于空穴附近的电势梯度。由于光催化剂表面的ET频率受光子吸收的限制，因此从能量状态和动力学方面进行光催化研究应与电化学研究不同。由于半导体光催化剂未连接到电源，因此能带位置的估计可能会发生变化，这实际上是根据锐钛矿和金红石TiO的能带排列进行讨论的2个晶体。
更新日期：2020-04-08
中文翻译：
光催化的内在性质与电化学比较
由于光能在环境清洁和太阳能生产中的独特应用，光催化一直备受关注。引发光催化反应的固液界面电子转移（ET）一直是电化学的主题，因此经常根据电化学来分析反应。但是，到目前为止，还没有讨论电化学概念的广泛应用。在本报告中，通过与电化学的比较，揭示了光催化的内在本质，并指出了使用电化学概念的局限性。计算并可视化了光催化剂表面附近的电势，显示出与电极表面相似但位于空穴附近的电势梯度。由于光催化剂表面的ET频率受光子吸收的限制，因此从能量状态和动力学方面进行光催化研究应与电化学研究不同。由于半导体光催化剂未连接到电源，因此能带位置的估计可能会发生变化，这实际上是根据锐钛矿和金红石TiO的能带排列进行讨论的2个晶体。
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