Enhanced photocatalysis by light-trapping optimization in inverse opals,Journal of Materials Chemistry A

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Enhanced photocatalysis by light-trapping optimization in inverse opals
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-09-09 , DOI: 10.1039/d0ta05655c
Xiwen Zhang _{1,

2,

3,

4} , Sajeev John _{1,

2,

3,

4}

Affiliation

Inverse opal photonic crystals with opal spheres of small diameters in the range of 70 to 170 nm have been widely adopted to enhance photocatalytic efficiency near the TiO₂ conduction band, using the slow-light modes on the red (long-wavelength) and blue (short-wavelength) edges of the fundamental optical stop gap. We show that these two spectral regions have comparable light harvesting abilities, but neither of them are the optimum spectral range for photocatalysis in TiO₂. Instead, the ideal resonant photonic modes are distributed among the higher order 5th to 15th photonic bands. By using larger opal spheres of ∼380 nm diameter, to place these higher order slow-light modes into the visible spectrum of 400 to 550 nm in lightly doped anatase TiO₂, enhanced photocatalytic efficiency is possible. For an imaginary part of the dielectric constant 0.01, the maximum achievable photocurrent density reaches 2.09 mA cm⁻² for a 6-layer inverse opal placed on a mirror substrate. This is 5.6 times the photocatalytic response of blue-edge slow photons near the TiO₂ electronic band edge.

中文翻译：

反蛋白石中的光阱优化增强了光催化作用

使用红色（长波长）和蓝色（慢波长）的慢光模式，具有小直径蛋白石球体的反蛋白石光子晶体在70至170 nm范围内被广泛采用，以提高TiO ₂导带附近的光催化效率。基本光阑间隙的边缘）。我们显示这两个光谱区域具有可比的光收集能力，但它们都不是TiO _2中光催化的最佳光谱范围。取而代之的是，理想的共振光子模式分布在第5至第15高阶光子带之间。通过使用直径约380 nm的较大蛋白石球，在轻掺杂的锐钛矿型TiO ₂中将这些更高阶的慢光模式置于400至550 nm的可见光谱中，可以提高光催化效率。对于介电常数0.01的虚部，对于放置在镜基板上的6层反蛋白石，最大可获得的光电流密度达到2.09mA cm ^-2。这是TiO ₂电子带边缘附近的蓝边慢光子的光催化响应的5.6倍。

更新日期：2020-09-22

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