Selective Formation of Polyaniline Confined in the Nanopores of a Metal–Organic Framework for Supercapacitors. Issue 10 (18th January 2021)

• Record Type: Journal Article
• Authors: Song, Yi‐Da; Ho, Wei Huan; Chen, Yu‐Chuan; Li, Jun‐Hong; Wang, Yi‐Sen; Gu, Yu‐Juan; Chuang, Cheng‐Hsun; Kung, Chung‐Wei
• Is Part Of: Chemistry. Volume 27:Issue 10(2021)
• Page Start: 3560
• Page End: 3567
• Publication Date: 2021-01-18
• Subjects: conducting polymer -- nanocomposite -- pore confinement -- pseudocapacitive material -- zirconium-based MOF; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202004516
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: In this study, a strategy that can result in the polyaniline (PANI) solely confined within the nanopores of a metal–organic framework (MOF) without forming obvious bulk PANI between MOF crystals is developed. A water‐stable zirconium‐based MOF, UiO‐66‐NH2, is selected as the MOF material. The polymerization of aniline is initiated in the acidic suspension of UiO‐66‐NH2 nanocrystals in the presence of excess poly(sodium 4‐styrenesulfonate) (PSS). Since the pore size of UiO‐66‐NH2 is too small to enable the insertion of the bulky PSS, the quick formation of pore‐confined solid PANI and the slower formation of well dispersed PANI:PSS occur within the MOF crystals and in the bulk solution, respectively. By taking advantage of the resulting homogeneous PANI:PSS polymer solution, the bulk PANI:PSS can be removed from the PANI/UiO‐66‐NH2 solid by successive washing the sample with fresh acidic solutions through centrifugation. As this is the first time reporting the PANI solely confined in the pores of a MOF, as a demonstration, the obtained PANI/UiO‐66‐NH2 composite material is applied as the electrode material for supercapacitors. The PANI/UiO‐66‐NH2 thin films exhibit a pseudocapacitive electrochemical characteristic, and their resulting electrochemical activity and charge‐storage capacities are remarkably higher than those of the bulk PANI thin films. Abstract : Polymer power : Polyaniline (PANI) solely confined within the nanopores of a water‐stable metal–organic framework (MOF) without forming obvious bulk PANI between MOF crystals is synthesized. The PANI/UiO‐66‐NH2 thin films exhibit a pseudocapacitive electrochemical characteristic, and their resulting electrochemical activity is remarkably higher than those of the bulk PANI thin films.