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.
Inorg Chem
; 58(21): 14693-14700, 2019 Nov 04.
Article
em En
| MEDLINE
| ID: mdl-31646865
ABSTRACT
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 â¼1.44 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.
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MEDLINE
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En
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Inorg Chem
Ano de publicação:
2019
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Article