Tunable Charge Transfer and Dual Plasmon Resonances of Au@WO3-x Hybrids and Applications in Photocatalytic Hydrogen Generation
Tunable Charge Transfer and Dual Plasmon Resonances of Au@WO3-x Hybrids and Applications in Photocatalytic Hydrogen Generation
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Au@WO3-x 杂化物的可调谐电荷转移和双等离子共振及其在光催化制氢中的应用
DOI：
10.1007/s11468-019-01002-y
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发表时间：
2020
期刊：
影响因子：
3
通讯作者：
Wang Qu-Quan
中科院分区：
文献类型：
--
作者：
Chen Kai;Gong Li-Li;Ding Si-Jing;Liu Jia;Ma Song;Wang Jia-Hong;Yang Da-Jie;Pan Gui-Ming;Hao Zhong-Hua;Zhou Li;Wang Qu-Quan
为了提高Au@WO_3−的光催化活性，我们合成了在可见光和近红外区域具有双等离激元共振的Au@WO_3杂化材料。Au核对异质结构的影响不大，对半导体等离子体激元有显著的修饰作用，对WO_3-−壳层的H_2生成有显著的促进作用。随着ρW：Au原子比从2增加到10，可见等离子体共振峰从540 nm蓝移到490 nm，而近红外等离子体共振强度显著增加，最终白光下Au@WO_3−杂化材料光催化产氢的平均增强因子从1.76增加到2.85。此外，H_2的产生与波长的依赖关系表明，随着−W：Au的增加，提高杂化物光催化活性的主要物理机制是从激发能量转移到从Au核到WO_3ρ壳的电子转移。这种具有双等离激元共振的金属-半导体异质纳米结构的构建对于太阳能转换的应用具有重要的现实意义。
We synthesized Au@WO3−xhybrids with dual plasmon resonances in visible and near-infrared (NIR) regions induced by two counterparts for enhancing photocatalytic activity. Au cores slightly influence hetero-morphology, significantly modify semiconductor plasmon, and prominently enhance H2generation of WO3−xshells. As atom ratio ofρW:Auincreases from 2 to 10, visible plasmon resonance is weakened with peak blueshifting from 540 to 490 nm, while NIR plasmon resonance strength prominently increases, and eventually average enhancement factor of photocatalytic H2generation of the Au@WO3−xhybrids with white light illuminations increases from 1.76 to 2.85. Furthermore, the wavelength dependence of H2generation reveals that the dominant physical mechanism of enhancing the photocatalytic activity of the hybrids is varied from excitation energy transfer to electron transfer from Au cores to WO3−xshells asρW:Auincreases. The construction of this metal-semiconductor hetero-nanostructure with dual plasmon resonances has immediate importance for the applications in solar energy conversions.