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首页> 外文期刊>Electrochimica Acta >A kinetic model for evaluating the dependence of the quantum yield of nano-TiO_2 based photocatalysis on light intensity, grain size, carrier lifetime, and minority carrier diffusion coefficient: Indirect interfacial charge transfer
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A kinetic model for evaluating the dependence of the quantum yield of nano-TiO_2 based photocatalysis on light intensity, grain size, carrier lifetime, and minority carrier diffusion coefficient: Indirect interfacial charge transfer

机译：用于评估基于纳米TiO_2的光催化的量子产率对光强度，晶粒尺寸，载流子寿命和少数载流子扩散系数的依赖性的动力学模型：间接界面电荷转移

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摘要

A model based on spherical TiO_2 nanoparticles was developed to study heterogeneous photocatalysis based on TiO_2 in the case of indirect interfacial charge transfer. In this model, the effect of light intensity (I_0), grain size (r_0), carrier lifetime (τ_p), and minority carrier diffusion coefficient (D_p) on the quantum yield (QY) of photocatalytic reactions was investigated in detail. Under conditions of sufficiently low incident-light intensity, the QY was found to be ∝I_0, while it decreased rapidly with an increase in I_0. In addition, the QY went to zero at a critically high light intensity. Furthermore, the QY was found to decrease with increasing r_0 due to the bulk-recombination loss, and the effect of r_0 on the QY became increasingly stronger with the increase in I_0. The QY decreased with the decrease in τ_p and D_p, which was more apparent at the critically high I_0. Under conditions of low [(RH_2)_(aq)], the QY increased with an increase in [(RH_2)_(aq)], while it remained nearly constant at high [(RH_2)_(aq)] due to the fact that the photoinduced electron interfacial transfer became the limiting step for photocatalytic reactions in the case of high [(RH_2)_(aq)].
机译：建立了基于球形TiO_2纳米粒子的模型，以研究间接界面电荷转移情况下基于TiO_2的非均相光催化作用。在该模型中，详细研究了光强度（I_0），晶粒尺寸（r_0），载流子寿命（τ_p）和少数载流子扩散系数（D_p）对光催化反应的量子产率（QY）的影响。在足够低的入射光强度的条件下，发现QY为∝I_0，而随着I_0的增加它迅速下降。此外，在非常高的光强度下，QY变为零。此外，发现由于体重组损失，QY随着r_0的增加而降低，并且随着I_0的增加，r_0对QY的影响变得越来越强。 QY随着τ_p和D_p的降低而降低，这在临界高的I_0时更明显。在低[（RH_2）_（aq）]的条件下，QY随着[（RH_2）_（aq）]的增加而增加，而由于[[RH_2] _（aq）]的增加，其QY几乎保持恒定。 [[RH_2] _（aq）]较高的情况下，光诱导的电子界面转移成为光催化反应的限制步骤。

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