Photocatalytic conversion of CO into small-molecule chemical feedstocks can meet the growing demand for energy and alleviate the global warming. Herein, a p-n ZnO@CDs@CoO heterojunction with sandwich structure was constructed by calcination method of self-assembled ZIF-8@CDs@ZIF-67. The ZnO@CDs@CoO with well-defined interfacial structure exhibited the significantly enhanced photocatalytic CO reduction activity, and the optimal catalyst indicated the (CO + CH) evolution rate of 214.53 µmol g h under simulated solar light, which was superior to ZnO, CoO and binary ZnO@CoO. The internal cavity, exposed active sites, multiple interfaces and constructed p-n heterojunction can facilitate the light harvesting and photoexcited electron transfer. Besides, after introduction of CDs placed in the middle layer between ZnO and CoO, CDs with excellent photoelectric property further promoted charge separation and migration. This work represents an appealing strategy to construct well-defined photocatalysts for boosting CO photoreduction.

中文翻译：

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构建具有多界面电子转移的ZnO@CDs@Co3O4三明治异质结构以增强光催化CO2还原

将二氧化碳光催化转化为小分子化学原料可以满足日益增长的能源需求并缓解全球变暖。本论文通过自组装ZIF-8@CDs@ZIF-67的煅烧方法构建了三明治结构的pn ZnO@CDs@CoO异质结。具有清晰界面结构的ZnO@CDs@CoO表现出显着增强的光催化CO还原活性，最佳催化剂在模拟太阳光下的(CO + CH)演化速率为214.53 µmol gh，优于ZnO、CoO和二元ZnO@CoO。内部空腔、暴露的活性位点、多个界面和构建的pn异质结可以促进光捕获和光激发电子转移。此外，在ZnO和CoO之间的中间层引入CDs后，具有优异光电性能的CDs进一步促进了电荷分离和迁移。这项工作代表了一种有吸引力的策略，可以构建明确的光催化剂来促进 CO 光还原。