Direct Z-Scheme Heterojunction of Semicoherent FAPbBr3/Bi2WO6 Interface for Photoredox Reaction with Large Driving Force
Direct Z-Scheme Heterojunction of Semicoherent FAPbBr3/Bi2WO6 Interface for Photoredox Reaction with Large Driving Force
复制标题
半相干 FAPbBr(3)/Bi2WO6 界面的直接 Z 型异质结用于大驱动力光氧化还原反应
DOI：
10.1021/acsnano.0c03146
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发表时间：
2020-12-22
期刊：
影响因子：
17.1
通讯作者：
Roeffaers, Maarten B. J.
中科院分区：
文献类型：
--
作者：
Huang, Haowei;Zhao, Jiwu;Roeffaers, Maarten B. J.
具有直接带隙和强光吸收的金属卤化物钙钛矿是用于收集太阳能的有前途的材料;然而，当用作光催化剂时，其相对窄的带隙限制了其氧化还原能力。添加具有适当能带结构偏移的第二半导体组分可以产生Z方案光催化系统，充分利用钙钛矿的固有特性。本论文以溴化铅和钨酸铋为原料，制备了一种具有强氧化还原能力的直接Z型光催化剂（FAPbBr（3）/Bi 2 WO 6）。具有理想的能带偏移和强的联合氧化还原电位，双光催化剂被示出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生载流子动力学，并证明了Z-计划电荷转移机制。在模拟太阳光照射下，在Z型FAPbBr（3）/Bi 2 WO 6光催化剂上实现了大驱动力（约2.57 eV）的CO2还原和苯甲醇氧化生成苯甲醛的光氧化还原反应，充分利用了组合体系的协同潜力.
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 (FAPbBr(3)/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 (similar to 2.57 eV) of CO2 reduction coupled with benzyl alcohol oxidation to benzaldehyde is achieved on the Z-scheme FAPbBr(3)/Bi2WO6 photocatalyst, harnessing the full synergetic potential of the combined system.