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Engineering the direct Z-scheme systems over lattice intergrown of MOF-on-MOF for selective CO2 photoreduction to CO
AIChE Journal ( IF 3.7 ) Pub Date : 2022-09-08 , DOI: 10.1002/aic.17906
Jian Li 1, 2 , Xinmiao Yu 1, 2 , Wenjuan Xue 1, 2 , Lei Nie 1, 2 , Hongliang Huang 1, 2 , Chongli Zhong 1, 2
Affiliation  

The direct Z-scheme provides a potential strategy for highly efficient CO2 photoreduction, whereas the heterointerface contact resistance is significantly limited the interfacial electron transfer kinetic. Herein, we build the directional charge-transfer channels in a direct Z-scheme system over metal–organic frameworks (MOFs), that is, the lattice-guided MOF-on-MOF hybrids, to facilitate CO2 photoreduction. The heteroepitaxial lattice growth along the c-axis of MIL-88B(Fe) via the high-activity (001) facet over the stable (111) facet of UiO-66-NH2. Theoretical calculations and experimental results provide direct evidence that engineering direct Z-scheme of these MOFs hybrids can induce the electrons migration from UiO-66-NH2 to the holes of MIL-88B(Fe) by directional charge-transfer channels owing to their lattice match. This can dramatically boost photocatalytic CO2-to-CO selectivity up to nearly 100%, with a rate of 2.26 μmol g−1 h−1. This work demonstrates that the efficiently selective CO2 photoreduction processes can be achieved by engineering Z-scheme via lattice intergrown of MOF hybrids strategy.

中文翻译:

在 MOF-on-MOF 的晶格共生上设计直接 Z 型系统,用于将 CO2 选择性光还原为 CO

直接 Z 型方案为高效 CO 2光还原提供了潜在策略,而异质界面接触电阻显着限制了界面电子转移动力学。在此,我们在金属有机框架 (MOF) 上的直接 Z 型系统中构建定向电荷转移通道,即晶格引导 MOF-on-MOF 杂化物,以促进 CO 2 光还原通过 UiO-66-NH 2的稳定 (111) 面上的高活性 (001) 面,沿 MIL-88B(Fe) c轴的异质外延晶格生长。理论计算和实验结果提供了直接证据,证明这些 MOFs 杂化物的工程直接 Z 方案可以诱导 UiO-66-NH 的电子迁移由于晶格匹配,2通过定向电荷转移通道转移到 MIL-88B(Fe) 的空穴。这可以显着提高光催化 CO 2到 CO 的选择性高达近 100%,速率为 2.26 μmol g −1  h −1。这项工作表明,高效选择性 CO 2光还原过程可以通过 MOF 混合策略的晶格共生设计 Z 型方案来实现。
更新日期:2022-09-08
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