Separated redox site strategies for engineering highly efficient photocatalysts: a pagoda-like In2O3/CuO heteroepitaxial structure coated with a N-doped C layer
Separated redox site strategies for engineering highly efficient photocatalysts: a pagoda-like In2O3/CuO heteroepitaxial structure coated with a N-doped C layer
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DOI：
10.1039/d0ta10831f
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发表时间：
2021-02
影响因子：
--
通讯作者：
Yun Yang;Liming Sun;Wenwen Zhan;Xiaojun Wang;Xiguang Han
中科院分区：
文献类型：
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作者：
Yun Yang;Liming Sun;Wenwen Zhan;Xiaojun Wang;Xiguang Han
为了制备高效的光催化剂，不仅要考虑光生载流子的产生、分离和迁移，还要考虑反应物的有效活化和氧化还原位点的合理分布。本文利用具有外延关系的MOF-on-MOF异质结构作为前驱体，制备了N掺杂C封装的宝塔状CuO-In 2 O3（In 2 O3/CuO@N-C）异质外延微棒。在所得的In 2 O3/CuO@N-C分级宝塔状微棒中，疏松的片层结构增强了光捕获能力，形成的CuO-In 2 O3 p-n异质结提高了光生载流子的分离效率，包覆的N掺杂碳层促进了光生载流子的转移和反应物的活化。更重要的是，CuO（外部纳米片）和In 2 O3（中心轴）的定向分离分别作为氧化和还原位点与2-苯基-1，2，3，4-四氢异喹啉和吲哚反应，有效避免了交叉偶联（CDC）的逆反应。因此，所制备的宝塔状In 2 O3/CuO@N-C异质外延微棒对CDC反应具有良好的光催化活性。本工作为全面构建高效光催化材料体系提供了一种新的设计策略。
In order to prepare efficient photocatalysts, it is necessary to consider not only the generation, separation and migration of photo-generated carriers, but also the effective activation of reactants and the reasonable distribution of redox sites. In this article, we utilized a MOF-on-MOF heterostructure with epitaxial relationship as the precursor to synthesize N-doped C encapsulated pagoda-like CuO–In2O3 (In2O3/CuO@N-C) heteroepitaxial micro-rods. In the obtained In2O3/CuO@N-C hierarchical pagoda-like micro-rods, the loose lamellar structure enhanced the light-harvesting capability, the formed CuO–In2O3 p–n heterojunction improved the separation efficiency of photo-generated carriers, and the coated N-doped carbon layer facilitated the transfer of photo-generated carriers and the activation of reactants. More importantly, the directional separation of CuO (external nanosheets) and In2O3 (central axis) acted as oxidation and reduction sites to react with 2-phenyl-1,2,3,4-tetrahydroisoquinoline and indole, respectively, which effectively avoided the inverse reaction of cross-dehydrogenative coupling (CDC). Therefore, the obtained pagoda-like In2O3/CuO@N-C heteroepitaxial micro-rods exhibited excellent photocatalytic activity for the CDC reaction. The present work provides a new design strategy for the comprehensive construction of a high efficiency photocatalytic material system.