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Plasmon-enhanced visible light photoelectrochemical and photocatalytic activity of gold nanoparticle-decorated hierarchical TiO_2/Bi_2WO_6 nanorod arrays

机译:等离子体增强的金纳米颗粒修饰的TiO_2 / Bi_2WO_6纳米棒阵列的可见光光电化学和光催化活性

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In this study, we show that the poor visible light photoelectrochemical (PEC) and photocatalytic activities of both wide-bandgap TiO2 and small-bandgap Bi(2)WO(6 )photocatalysts can be remarkably enhanced by constructing hierarchical Bi2WO6 nanosheet-wrapped TiO2 nanorod arrays (NRAs). X-ray photoelectron spectroscopy (XPS) measurements give direct experimental evidence for the establishment of a type II band alignment, which realizes visible light PEC performance of heterogeneous architecture through the transfer of photoexcited electrons from Bi2WO6 to TiO2. Moreover, Au nanoparticles (NPs) grown on the hierarchical Bi2WO6 nanosheets of TiO2/Bi2WO6 NRAs drastically enhance visible light PEC and photocatalytic activity of heterogeneous architectures because of surface plasmon resonance (SPR) effect. Benefiting from the synergistic effect of the type II band alignment and SPR effect, the hierarchical TiO2/Bi2WO6/Au NRAs achieve a photocurrent density of 29 mu A cm(-2), 11 times higher than that of TiO2 NRAs and 2.6 times as high as that of hierarchical TiO2/Bi2WO6 NRAs at 1 V vs Ag/AgCl. The hierarchical TiO2/Bi2WO6/Au NRAs exhibit remarkable stability in 2 h of light illumination. Additionally, the hierarchical TiO2/Bi2WO6/Au architectures show a significantly enhanced photocatalytic degradation for methyl blue (MB) molecules with a photodegradation of 91.5%. The study sheds new light on constructing visible light photocatalyst by forming the type II band alignment and integrating SPR effect.
机译:在这项研究中,我们表明,通过构造分层的Bi2WO6纳米片包裹的TiO2纳米棒,可以显着增强宽带隙TiO2和小带隙Bi(2)WO(6)光催化剂的不良可见光光电化学(PEC)和光催化活性。阵列(NRA)。 X射线光电子能谱(XPS)测量为建立II型能带对准提供了直接的实验证据,该II型能带对准通过将光激发电子从Bi2WO6转移到TiO2实现了异质结构的可见光PEC性能。此外,由于表面等离振子共振(SPR)效应,生长在TiO2 / Bi2WO6 NRA的分层Bi2WO6纳米片上的金纳米颗粒(NPs)大大增强了可见光PEC和异质结构的光催化活性。得益于II型谱带对准和SPR效应的协同作用,分层TiO2 / Bi2WO6 / Au NRA的光电流密度为29μA cm(-2),比TiO2 NRA的光电流密度高11倍,高2.6倍。与1 V时的Ag / AgCl分层TiO2 / Bi2WO6 NRA相似。分层的TiO2 / Bi2WO6 / Au NRA在2 h的光照下表现出显着的稳定性。此外,分层的TiO2 / Bi2WO6 / Au结构显示出对甲基蓝(MB)分子的光催化降解显着增强,光降解率为91.5%。该研究通过形成II型能带排列和整合SPR效应,为构造可见光光催化剂提供了新的思路。

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