Jie P, Wang X, Zhang F, Wen C, Feng L, Qu F, Liang X. Self-Standing combined covalent-organic-framework membranes for subzero conductivity assisted by ionic liquids.
J Colloid Interface Sci 2021;
599:595-602. [PMID:
33984759 DOI:
10.1016/j.jcis.2021.04.130]
[Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/15/2021] [Accepted: 04/27/2021] [Indexed: 12/19/2022]
Abstract
The development of proton-conducting materials in cold regions is still at the initial stage due to the challenge in breaking the subzero temperature limit, especially in covalent organic frameworks (COFs). Herein, we fabricated a series of proton-conductive COFs as self-standing, highly flexible combined membranes (ssc-COFMs) composed of a processable TpBD-Me2 and a conductive Tp-TGCl, in-situ encapsulated proton-conducting ionic liquids (PCILs) as additional proton sources into backbones. Compositions and microstructures of ssc-COFMs are monitored by XRD, FTIR, nitrogen adsorption and elemental analysis. Comparison to other porous organic conductors, a great advance propelled renders the combined COF membranes to have a high protonic conductivities at medium and subzero temperatures (243 to 353 K), owing to the resultant multifaceted synergistic effect of multiple proton units. Specifically, the proton conductivities of the ssc-COFMs loaded with -SO4H functionalized PCILs reaches 2.87 × 10-4 S cm-1 (~58% RH) and 9.93 × 10-4 S cm-1 (~98% RH) at 243 K, together with 6.84 × 10-2 S·cm-1 under 353 K and ~ 98% RH.
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