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Structure–Property–Performance Relationships of Cuprous Oxide Nanostructures for Dielectric Mie Resonance-Enhanced Photocatalysis
ACS Catalysis ( IF 12.9 ) Pub Date : 2022-06-21 , DOI: 10.1021/acscatal.2c00977
Ravi Teja A. Tirumala 1 , Sunil Gyawali 2 , Aaron Wheeler 1 , Sundaram Bhardwaj Ramakrishnan 1 , Rishmali Sooriyagoda 2 , Farshid Mohammadparast 1 , Nishan Khatri 3 , Susheng Tan 4 , A. Kaan Kalkan 3 , Alan D. Bristow 2 , Marimuthu Andiappan 1
Affiliation  

Nanostructured metal oxides, such as Cu2O, CeO2, α-Fe2O3, and TiO2, can efficiently mediate photocatalysis for solar-to-chemical energy conversion and pollution remediation. In this contribution, we report a novel approach, dielectric Mie resonance-enhanced photocatalysis, to enhance the catalytic activity of metal oxide photocatalysts. Specifically, we demonstrate that Cu2O nanostructures exhibiting dielectric Mie resonances can exhibit up to an order of magnitude higher photocatalytic rate as compared with Cu2O nanostructures not exhibiting dielectric Mie resonances. Our finite-difference time-domain (FDTD) simulation and experimental results predict a volcano-type relationship between the photocatalytic rate and the size of Cu2O nanospheres and nanocubes. Using transient absorption measurements, we reveal that a coherent electronic process associated with dielectric Mie resonance-mediated charge carrier generation is dominant in Cu2O nanostructures that exhibit higher photocatalytic rates. Although we experimentally demonstrate dielectric Mie resonance-enhanced photocatalysis with only Cu2O nanoparticles here, based on our FDTD simulations, we anticipate the same can be achieved with other metal oxide photocatalysts, including CeO2, α-Fe2O3, and TiO2.

中文翻译:

用于介电米氏共振增强光催化的氧化亚铜纳米结构的结构-性能-性能关系

纳米结构的金属氧化物,如Cu 2 O、CeO 2、α-Fe 2 O 3和TiO 2,​​可以有效地介导光催化,用于太阳能转化为化学能和污染修复。在此贡献中,我们报告了一种新方法,即介电 Mie 共振增强光催化,以增强金属氧化物光催化剂的催化活性。具体而言,我们证明与 Cu 2相比,表现出介电 Mie 共振的 Cu 2 O 纳米结构可以表现出高达一个数量级的光催化速率。O 纳米结构不表现出介电米氏共振。我们的有限差分时域 (FDTD) 模拟和实验结果预测了光催化速率与 Cu 2 O 纳米球和纳米立方体尺寸之间的火山型关系。使用瞬态吸收测量,我们揭示了与介电 Mie 共振介导的电荷载流子产生相关的相干电子过程在表现出更高光催化速率的 Cu 2 O 纳米结构中占主导地位。尽管我们在这里通过实验证明了仅使用 Cu 2 O 纳米粒子的介电 Mie 共振增强光催化,但基于我们的 FDTD 模拟,我们预计其他金属氧化物光催化剂也可以实现相同的效果,包括 CeO 2、α-Fe2 O 3和TiO 2
更新日期:2022-06-21
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