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Immobilization of Polyiodide Redox Species in Porous Carbon for Battery-Like Electrodes in Eco-Friendly Hybrid Electrochemical Capacitors

Abbas, Q.; Fitzek, H.; Schröttner, H.; Dsoke, S.; Gollas, B.

Abstract (englisch):
Hybrid electrochemical capacitors have emerged as attractive energy storage option, which
perfectly fill the gap between electric double-layer capacitors (EDLCs) and batteries, combining
in one device the high power of the former and the high energy of the latter. We show that the
charging characteristics of the positive carbon electrode are transformed to behave like a battery
operating at nearly constant potential after it is polarized in aqueous iodide electrolyte (1 mol L−1
NaI). Thermogravimetric analysis of the positive carbon electrode confirms the decomposition of
iodides trapped inside the carbon pores in a wide temperature range from 190 ◦C to 425 ◦C, while
Raman spectra of the positive electrode show characteristic peaks of I3
− and I5
− at 110 and 160 cm−1
respectively. After entrapment of polyiodides in the carbon pores by polarization in 1 mol L−1 NaI,
the positive electrode retains the battery-like behavior in another cell, where it is coupled with a
carbon-based negative electrode in aqueous NaNO3 electrolyte without any redox species. This
new cell (the iodide-ion capacitor) demonstrates the charging characteristics of a hybrid capacitor with
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Verlagsausgabe §
DOI: 10.5445/IR/1000099952
Veröffentlicht am 18.11.2019
DOI: 10.3390/nano9101413
Zitationen: 3
Web of Science
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2079-4991
KITopen-ID: 1000099952
HGF-Programm 37.01.02 (POF III, LK 01) Components and Cells
Erschienen in Nanomaterials
Verlag MDPI
Band 9
Heft 10
Seiten Article No.1413
Vorab online veröffentlicht am 03.10.2019
Schlagwörter hybrid electrochemical capacitor; redox active electrolyte; polyiodide immobilizaton; battery-like electrode; charge transfer; activated carbon
Nachgewiesen in Scopus
Web of Science
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