A Universal Single‐Atom Coating Strategy Based on Tannic Acid Chemistry for Multifunctional Heterogeneous Catalysis. Issue 14 (15th February 2022)

• Record Type: Journal Article
• Authors: Wang, Haifeng; Li, Xiaopeng; Jiang, Ying; Li, Minhan; Xiao, Qi; Zhao, Tao; Yang, Shuai; Qi, Chunhong; Qiu, Pengpeng; Yang, Jianping; Jiang, Zheng; Luo, Wei
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 14(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-15
• Subjects: Heterojunction -- Oxygen Reduction Reaction -- Photocatalysis -- Single-Atom Coating -- Tannic Acid Chemistry; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202200465
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Here, we report a universal single‐atom coating (SAC) strategy by taking advantage of the rich chemistry of tannic acid (TA). TA units not only self‐assemble into a cross‐linked porous polyphenolic framework, but also can grip on different substates via multiple binding modes. Benefiting from the diverse chelating ability of TA, a series of mono‐, and bi‐metallic SACs can be formed on substrates of different materials (e. g., carbon, SiO2, TiO2, MoS2 ), dimensions (0D–3D) and sizes (50 nm–5 cm). By contrast, uniform SAC cannot be achieved using common approaches such as pyrolysis of metal–dopamine complexes or metal–organic frameworks. As a proof‐of‐concept demonstration, two Co SACs immobilized on graphene and TiO2 were prepared. The former one shows six‐fold higher mass activity than Pt/C toward oxygen reduction. The latter one displays outstanding photocatalytic activity owing to the high activity of the single atoms and the formation of the single‐atom coating–TiO2 heterojunction. Abstract : Based on the tannic acid coating method, a series of mono‐ and bi‐metallic single‐atom coatings (SACs) (e. g., Co, Fe, Mn, Co−Mn, Fe−Mn) can be formed on substrates of different materials (e. g., carbon black, carbon nanotubes, graphene, carbon cloth, SiO2, TiO2, ZnO, MoS2 ), dimensions (0D–3D) and sizes (50 nm–5 cm).