A Universal Single‐Atom Coating Strategy Based on Tannic Acid Chemistry for Multifunctional Heterogeneous Catalysis
Haifeng Wang, Xiaopeng Li, Ying Jiang, Minhan Li, Qi Xiao, Tao Zhao, Shuai Yang, Chunhong Qi, Pengpeng Qiu, Jianping Yang, Zheng Jiang, Wei Luo
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, SiO 2 , TiO 2 , MoS 2 ), 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 TiO 2 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–TiO 2 heterojunction.