PANa/Covalent organic framework composites with improved water uptake and proton conductivity. Issue 8 (4th January 2022)

• Record Type: Journal Article
• Authors: Yang, Jianjian; Xie, Changsong; Yang, Qianqian; Wang, Shuang; Gao, Yun; Ji, Jiahui; Du, Zecheng; Kang, Zixi; Wang, Rongming; Sun, Daofeng
• Is Part Of: Chemical communications. Volume 58:Issue 8(2022)
• Page Start: 1131
• Page End: 1134
• Publication Date: 2022-01-04
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/d1cc06010d
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : In this communication, we construct composite-type PANa@UCOF- x by the in situ reaction strategy, which combines the advantages of UCOF with ordered channels and PANa with high water uptake, thus improving the proton conductivity of UCOF. Abstract : It is a challenge to effectively load proton carriers in COFs to improve their proton conductivity. Herein, we report a series of COF-based composites, PANa@UCOF- x (PANa: sodium polyacrylate, x : weight percentage of PANa), which were prepared by coating different proportions of superabsorbent PANa on the COF surface based on an in situ reaction strategy. Since PANa can greatly enhance the enrichment of water molecules in one-dimensional (1D) channels of COFs, these COF-based composites exhibit superprotonic conduction. At 80 °C and 95% relative humidity (RH), the proton conductivity of PANa@UCOF-10, PANa@UCOF-28 and PANa@UCOF-40 reaches 1.6 × 10 −2, 5.1 × 10 −2, and 1.1 × 10 −1 S cm −1, respectively, which is 4–5 orders of magnitude higher than 7.4 × 10 −7 S cm −1 of the original UCOF. This work not only develops a new method to improve the water content of the COF channels, but also proves the important role of ordered channels in constructing effective proton conduction pathways.