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Design and Preparation of a Superior Proton Conductor by Confining Tetraethylenepentamine in the Pores of ZIF-8 to Induce Further Adsorption of Water and Carbon Dioxide

journal contribution
posted on 2019-01-01, 00:00 authored by Q Ren, J W Yu, H B Luo, J Zhang, Lifeng WangLifeng Wang, X M Ren
Copyright © 2019 American Chemical Society. In this work, we present a new strategy toward the design and preparation of a metal-organic framework- or porous coordination polymer-based superior proton conductor. We chose a robust metal-organic framework, ZIF-8, as the host and a flexible aliphatic alkylpolyamine, tetraethylenepentamine (TEPA), as the guest, and we successfully prepared an encapsulation compound TEPA@ZIF-8 via the facile insertion of TEPA into the pores of ZIF-8, which was characterized by microanalysis, thermogravimetric analysis, IR spectroscopy, N2, water vapor adsorption-desorption, and other methods. Each cage in ZIF-8 is occupied by ∼1.44 TEPA molecules, and the introduced TEPA further adsorbs H2O and CO2 from air to offer a superior proton conductor, TEPA@ZIF-8-H2CO3, with σ = 2.08 × 10-3 S cm-1 at 293 K and 99% relative humidity, and excellent proton conduction durability. Regarding ZIF-8, the proton conductivity of TEPA@ZIF-8-H2CO3 increases by 3 orders of magnitude at the same condition, and the activation energy decreases by 0.91 eV. Remarkably, TEPA@ZIF-8-H2CO3 also shows promising features for the detection of aqueous ammonia. This work provides more opportunities to achieve superior protonic conducting materials and suggests that MOF-based proton conductors possess great potential for applications in ammonia sensing.

History

Journal

Inorganic Chemistry

Volume

58

Issue

21

Pagination

14693 - 14700

Publisher

ACS Publications

Location

Washington, D.C.

ISSN

0020-1669

eISSN

1520-510X

Language

eng

Publication classification

C1 Refereed article in a scholarly journal