Wang Haifeng, Li Xiaopeng, Jiang Ying, Li Minhan, Xiao Qi, Zhao Tao, Yang Shuai, Qi Chunhong, Qiu Pengpeng, Yang Jianping, Jiang Zheng, Luo Wei
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering, Donghua University, No. 2999 North Renmin Road, Songjiang District, Shanghai, 201620, P.R. China.
Materials Genome Institute, Shanghai University, 200444, Shanghai, P.R. China.
Angew Chem Int Ed Engl. 2022 Mar 28;61(14):e202200465. doi: 10.1002/anie.202200465. Epub 2022 Feb 15.
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 , TiO , MoS ), 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 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 heterojunction.
在此，我们报道了一种利用单宁酸（TA）丰富化学性质的通用单原子涂层（SAC）策略。TA单元不仅能自组装成交联多孔多酚框架，还能通过多种结合模式附着在不同的基底上。受益于TA多样的螯合能力，一系列单金属和双金属SAC可在不同材料（如碳、SiO、TiO、MoS）、尺寸（0D - 3D）和大小（50 nm - 5 cm）的基底上形成。相比之下，使用诸如金属 - 多巴胺配合物或金属 - 有机框架的热解等常见方法无法实现均匀的SAC。作为概念验证演示，制备了两种固定在石墨烯和TiO上的Co SAC。前者对氧还原的质量活性比Pt/C高六倍。后者由于单原子的高活性以及单原子涂层 - TiO异质结的形成而表现出出色的光催化活性。
