Guo Changfa, Chen De-Li, Hu Yong
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, Jinhua 321004, China.
Hangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou, Zhejiang 311231, China.
Langmuir. 2022 May 31;38(21):6491-6498. doi: 10.1021/acs.langmuir.2c00820. Epub 2022 May 19.
Photocatalytic CO reduction to value-added chemicals is a green solution to concurrently address CO emission and energy issues, and semiconductor heterojunctions hold great potential to achieve such conversion. However, the photocatalytic performance of the existing heterojunctions is limited by the low interfacial charge transfer efficiency and sluggish surface reaction kinetics. To overcome these obstacles, defect engineering has been applied to heterojunctions to boost CO photoreduction in the past 5 years. This perspective summaries the key roles and the related mechanism of various anion vacancies located at the surface, interface, and both surface and interface of heterojunctions in photocatalytic CO reduction. Challenges in constructing and characterizating defective heterojunctions as well as in promoting their CO photoreduction activity and hydrocarbon selectivity are then outlined. Finally, some solutions to the rational design of defective heterojunctions for efficient and stable CO photoreduction are also proposed.
光催化将CO还原为增值化学品是一种同时解决CO排放和能源问题的绿色解决方案，半导体异质结在实现这种转化方面具有巨大潜力。然而，现有异质结的光催化性能受到低界面电荷转移效率和缓慢表面反应动力学的限制。为了克服这些障碍，在过去五年中，缺陷工程已应用于异质结以促进CO光还原。本文综述了位于异质结表面、界面以及表面和界面处的各种阴离子空位在光催化CO还原中的关键作用和相关机制。然后概述了构建和表征缺陷异质结以及提高其CO光还原活性和烃选择性方面的挑战。最后，还提出了一些合理设计缺陷异质结以实现高效稳定CO光还原的解决方案。
