Action spectra in semiconductor photocatalysis,Chemical Society Reviews

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Action spectra in semiconductor photocatalysis
Chemical Society Reviews ( IF 40.4 ) Pub Date : 2017-06-30 00:00:00 , DOI: 10.1039/c7cs00136c
Soo-Keun Lee _{1,

2,

3} , Andrew Mills _{4,

5,

6} , Christopher O'Rourke _{4,

5,

6}

Affiliation

Action spectra are an increasingly important part of semiconductor photocatalyst research, and comprise a plot of photonic efficiency, η, versus excitation wavelength, λ. The features and theory behind an ideal photocatalytic system are discussed, and used to identify: (i) the key aspect of an ideal action spectrum, namely: it is a plot of η vs. λ which has the same shape as that of the fraction of radiation absorbed by the semiconductor photocatalyst, f, versus λ and (ii) the key requirement when running an action spectrum, namely, that the initial rate of the photocatalytic process is directly proportional to incident photon flux, ρ, at wavelengths where η > 0. The Pt/TiO₂/MeOH system is highlighted as an example of a photosystem that yields an ideal action spectrum. Most photocatalytic systems exhibit non-ideal action spectra, mostly due to one or more of the following: light intensity effects, crystal phase effects, dye-sensitisation, dye photolysis, charge transfer complex, CTC, formation and localized surface plasmon radiation, LSPR, absorption by a deposited noble metal catalyst. Each of these effects is illustrated using examples taken from the literatures and discussed. A suggested typical protocol for recording the action spectrum and absorption/diffuse reflectance spectrum of a photocatalytic system is described. The dangers of using a dye to probe the activity of a photocatalysts are also discussed, and a possible way to avoid this, via reductive photocatalysis, is suggested.

中文翻译：

半导体光催化作用谱

作用谱是半导体光催化剂的研究的一个越来越重要的部分，并且包括的光子效率，曲线η，对激发波长λ。讨论了理想光催化系统的特征和理论，并将其用于识别：（i）理想作用谱的关键方面，即：它是η与λ的关系图，其形状与馏分的形状相同辐射的吸收由半导体光催化剂，˚F，与λ运行的作用光谱时，即和（ii）的关键要求，即光催化过程的初始速率正比于入射光子通量，ρ，波长处η >0。Pt / TiO ₂ / MeOH系统以产生理想作用谱的光系统为例突出显示。大多数光催化系统表现出非理想的作用谱，这主要归因于以下一种或多种：光强度效应，晶相效应，染料敏化，染料光解，电荷转移络合物，CTC，形成和局部表面等离激元辐射，LSPR，被沉积的贵金属催化剂吸收。这些效果中的每一个都使用从文献中获得的示例进行说明并进行了讨论。描述了用于记录光催化系统的作用光谱和吸收/扩散反射光谱的建议的典型协议。还讨论了使用染料探测光催化剂活性的危险，并提出了避免这种情况的可能方法，建议通过还原性光催化。

更新日期：2017-07-02

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