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Direct Z-Scheme Heterojunction of Semicoherent FAPbBr3/Bi2WO6 Interface for Photoredox Reaction with Large Driving Force.
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-23 , DOI: 10.1021/acsnano.0c03146
Haowei Huang 1 , Jiwu Zhao 2 , Yijie Du 3 , Chen Zhou 4 , Menglong Zhang 5 , Zhuan Wang 3 , Yuxiang Weng 3 , Jinlin Long 2 , Johan Hofkens 6, 7 , Julian A Steele 1 , Maarten B J Roeffaers 1
Affiliation  

Metal halide perovskites with direct band gap and strong light absorption are promising materials for harvesting solar energy; however, their relatively narrow band gap limits their redox ability when used as a photocatalyst. Adding a second semiconductor component with the appropriate band structure offsets can generate a Z-scheme photocatalytic system, taking full advantage of the perovskite’s intrinsic properties. In this work, we develop a direct Z-scheme photocatalyst based on formamidinium lead bromide and bismuth tungstate (FAPbBr3/Bi2WO6) with strong redox ability for artificial solar-to-chemical energy conversion. With desirable band offsets and strong joint redox potential, the dual photocatalyst is shown to form a semicoherent heterointerface. Ultrafast transient infrared absorption studies employing selective excitation reveal synergetic photocarrier dynamics and demonstrate Z-scheme charge transfer mechanisms. Under simulated solar irradiation, a large driving force photoredox reaction (∼2.57 eV) of CO2 reduction coupled with benzyl alcohol oxidation to benzaldehyde is achieved on the Z-scheme FAPbBr3/Bi2WO6 photocatalyst, harnessing the full synergetic potential of the combined system.

中文翻译:

用于具有大驱动力的光氧化还原反应的半相干 FAPbBr3/Bi2WO6 界面的直接 Z 型异质结。

具有直接带隙和强光吸收的金属卤化物钙钛矿是收集太阳能的有前途的材料;然而,当用作光催化剂时,它们相对较窄的带隙限制了它们的氧化还原能力。添加具有适当能带结构偏移的第二个半导体组件可以生成 Z 型光催化系统,充分利用钙钛矿的固有特性。在这项工作中,我们开发了一种基于甲脒溴化铅和钨酸铋的直接 Z 型光催化剂 (FAPbBr 3 /Bi 2 WO 6) 具有很强的氧化还原能力,可用于人工太阳能转化为化学能。具有理想的带偏移和强联合氧化还原电位,双光催化剂显示形成半相干异质界面。采用选择性激发的超快瞬态红外吸收研究揭示了协同光载流子动力学并展示了 Z 型电荷转移机制。在模拟太阳辐射下,在Z型FAPbBr 3 /Bi 2 WO 6光催化剂上实现了CO 2还原与苯甲醇氧化成苯甲醛的大驱动力光氧化还原反应(~2.57 eV),充分利用了组合系统。
更新日期:2020-06-23
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