Incorporating conducting polypyrrole into a polyimide COF for carbon-free ultra-high energy supercapacitor

TitleIncorporating conducting polypyrrole into a polyimide COF for carbon-free ultra-high energy supercapacitor
Publication TypeJournal Article
Year of Publication2022
AuthorsHaldar, S, Rase, D, Shekhar, P, Jain, C, Vinod, CPrabhakara, Zhang, E, Shupletsov, L, Kaskel, S, Vaidhyanathan, R
JournalAdvanced Energy Materials
Volume12
Issue34
Pagination2200754
Date PublishedSEP
Type of ArticleArticle
ISSN1614-6832
Keywordscarbon free capacitors, cation-anion co-storage, conductivity, high energy capacitors, polypyrrole doped COFs
Abstract

Redox-active covalent organic frameworks (COFs) store charges but possess inadequate electronic conductivity. Their capacitive action works by storing H+ ions in an acidic electrolyte and is typically confined to a small voltage window (0-1 V). Increasing this window means higher energy and power density, but this risks COF stability. Advantageously, COF's large pores allow the storage of polarizable bulky ions under a wider voltage thus reaching higher energy density. Here, a COF-electrode-electrolyte system operating at a high voltage regime without any conducting carbon or redox active oxides is presented. Conducting polypyrrole (Ppy) chains are synthesized within a polyimide COF to gain electronic conductivity (approximate to 10 000-fold). A carbon-free quasi-solid-state capacitor assembled using this composite showcases high pseudo-capacitance (358 mF cm(-2)@1 mA cm(-2)) in an aqueous gel electrolyte. The synergy among the redox-active polyimide COF, polypyrrole and organic electrolytes allows a wide-voltage window (0-2.5 V) leading to high energy (145 mu Wh cm(-2)) and power densities (4509 mu W cm(-2)). Amalgamating the polyimide-COF and the polypyrrole as one material minimizes the charge and mass transport resistances. Computation and experiments reveal that even a partial translation of the modules/monomers intrinsic electronics to the COF imparts excellent electrochemical activity. The findings unveil COF-confined polymers as carbon-free energy storage materials.

DOI10.1002/aenm.202200754
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

29.698

Divison category: 
Catalysis and Inorganic Chemistry
Database: 
Web of Science (WoS)

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