Self-Standing combined covalent-organic-framework membranes for subzero conductivity assisted by ionic liquids

Pengfei Jie; Xin Wang; Feng Zhang; Chen Wen; Lei Feng; Fengyu Qu; Xiaoqiang Liang

doi:10.1016/j.jcis.2021.04.130

Self-Standing combined covalent-organic-framework membranes for subzero conductivity assisted by ionic liquids

J Colloid Interface Sci. 2021 Oct:599:595-602. doi: 10.1016/j.jcis.2021.04.130. Epub 2021 Apr 30.

Authors

Pengfei Jie¹, Xin Wang², Feng Zhang³, Chen Wen⁴, Lei Feng⁴, Fengyu Qu⁵, Xiaoqiang Liang⁶

Affiliations

¹ Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, Heilongjiang Province and College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, PR China.
² Office of Educational Administration, Heilongjiang College of Finance and Economics, Harbin 150025, PR China.
³ Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, Heilongjiang Province and College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, PR China. Electronic address: zhangfeng@hrbnu.edu.cn.
⁴ Beijing Spacecrafts, Beijing 100094, PR China.
⁵ Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, Heilongjiang Province and College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, PR China. Electronic address: qufengyu@hrbnu.edu.cn.
⁶ College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, PR China. Electronic address: xq-liang@163.com.

PMID: 33984759
DOI: 10.1016/j.jcis.2021.04.130

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-TG_Cl, 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.

Keywords: Covalent organic frameworks; Ionic liquids; Proton conduction; Subzero temperature; Wide temperature.