Chang Liu , Jingze Shao , Jinghui Wang , Yaowen Wang , Yan Wang , Zhipeng Fan , Liping Li , Guangshe Li
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引用次数: 0
摘要
动态 p-n 结可以驱动电子从 p 型向 n 型漂移，同时驱动空穴向相反的方向漂移，这为下一代先进光催化剂的开发提供了广阔的前景。然而，构建动态 p-n 结仍然具有挑战性。本文通过杂化两种 n 型半导体（掺杂锌的 TiO2 和掺杂 P 的 C3N4），构建了原子尺度的动态 p-n 结。催化剂（Z0.01T/CNP-4）对盐酸四环素（TCH）具有稳定而显著的光氧化能力，其时空产率远高于之前的报道。最重要的是，-O2- 物种与通过原子级 p-n 结快速分离的光生电子发生反应，生成 H2O2，进一步促进了 TCH 光氧化过程。这些发现为制造更新型的动态 p-n 结提供了新的线索，从而有效利用光产生的电子和空穴，充分发挥光催化反应的潜力。
Construction of dynamic p-n junctions at atomic-scale for unanticipated photocatalytic oxidation activity
Dynamic p-n junction can drive a drift of electrons from p-type to n-type side, and that of holes in the opposite direction simultaneously, which offers a promising avenue for next generation of advanced photocatalysts. However, construction of dynamic p-n junctions still remains challenging. Herein, dynamic p-n junctions at atomic-scale are constructed by hybridizing two n-type semiconductors, Zn-doped TiO2 and P-doped C3N4. The catalyst (Z0.01T/CNP-4) gives a stable and remarkable photo-oxidation ability for tetracycline hydrochloride (TCH), giving a much higher space-time yield than previously reported. h+, •O2−, and •OH radicals are main active species for the TCH photo-oxidation. Most importantly, •O2− species react with photo-generated electrons rapidly separated via atomic-level p-n junctions to yield H2O2 that further promotes the TCH photo-oxidation process. These findings provide new hints in fabricating more novel dynamic p-n junctions for effectively utilizing both photo-generated electrons and holes in the meanwhile to achieve the full potential of photocatalytic reactions.
期刊介绍：
Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including:
1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources.
2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes.
3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts.
4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells.
5.Catalytic reactions that convert wastes into useful products.
6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts.
7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems.
8.New catalytic combustion technologies and catalysts.
9.New catalytic non-enzymatic transformations of biomass components.
The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.
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