Anchoring of Formamidinium Lead Bromide Quantum Dots on Ti3C2 Nanosheets for Efficient Photocatalytic Reduction of CO2.
Anchoring of Formamidinium Lead Bromide Quantum Dots on Ti3C2 Nanosheets for Efficient Photocatalytic Reduction of CO2.
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DOI：
10.1021/acsami.0c18391
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发表时间：
2021-01
影响因子：
9.5
通讯作者：
Meidan Que;Yang Zhao;Yawei Yang;L. Pan;Wanying Lei;Weihua Cai;Hudie Yuan;Jin Chen;G. Zhu
中科院分区：
文献类型：
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作者：
Meidan Que;Yang Zhao;Yawei Yang;L. Pan;Wanying Lei;Weihua Cai;Hudie Yuan;Jin Chen;G. Zhu
金属卤化物钙钛矿具有合适的能带结构和优异的可见光响应，是一种有前景的二氧化碳减排光催化剂。然而，所报道的无机卤化物钙钛矿由于相敏感和严重的载流子复合而具有不良的催化性能。在此，我们将 FAPbBr3 量子点 (QD) 锚定在 Ti3C2 纳米片上，在肖特基异质结内形成 FAPbBr3/Ti3C2 复合材料，用于光催化 CO2 还原。在可见光照射下，FAPbBr3/Ti3C2 复合光催化剂在去离子水存在下表现出引人注目的光催化性能。 Ti3C2纳米片充当电子受体，促进激子的快速分离并提供特定的催化位点。 FAPbBr3/0.2-Ti3C2复合材料的最佳电子消耗率为717.18 μmol/g·h，比原始FAPbBr3 QDs（343.90 μmol/g·h）提高了2.08倍。同时，FAPbBr3/Ti3C2光催化剂在光催化反应过程中也表现出优异的稳定性。这项工作拓展了设计用于二氧化碳减排的卓越钙钛矿/MXene 光催化剂的新见解和平台。
Metal halide perovskite with a suitable energy band structure and excellent visible-light response is a prospective photocatalyst for CO2 reduction. However, the reported inorganic halide perovskites have undesirable catalytic performances due to phase-sensitive and severe charge carrier recombination. Herein, we anchor the FAPbBr3 quantum dots (QDs) on Ti3C2 nanosheets to form a FAPbBr3/Ti3C2 composite within a Schottky heterojunction for photocatalytic CO2 reduction. Upon visible-light illumination, the FAPbBr3/Ti3C2 composite photocatalyst exhibits an appealing photocatalytic performance in the presence of deionized water. The Ti3C2 nanosheet acts as an electron acceptor to promote the rapid separation of excitons and supply specific catalytic sites. An optimal electron consumption rate of 717.18 μmol/g·h is obtained by the FAPbBr3/0.2-Ti3C2 composite, which has a 2.08-fold improvement over the pristine FAPbBr3 QDs (343.90 μmol/g·h). Meanwhile, the FAPbBr3/Ti3C2 photocatalyst also displays a superior stability during photocatalytic reaction. This work expands a new insight and platform for designing superb perovskite/MXene-based photocatalysts for CO2 reduction.