Abstract
This article discusses the conversion of electrodeposited iodine to polyiodides within the nanopores of carbon electrodes that affect the performance of iodide electrolyte-based electrochemical cells. Here, carbon electrodes have been polarized in aqueous sodium iodide electrolyte to store charge in the form of solid iodine via highly reversible reaction (2I −⇌I 2+2e −). The stored iodine within the pores interacts with free iodide ions present in the bulk electrolyte via comproportionation reactions leading to polyiodide (I 3 − and I 5 −) formations. By tuning the mass asymmetry of carbon electrodes in hybrid cells and using the in-situ Raman spectroscopy on positive battery electrode, we show the influence of iodine/polyiodides equilibrium shifts on the self-discharge and voltage rebounds during open circuit conditions. This study provides insights into the charging mechanisms of carbon electrodes for iodine-based hybrid supercapacitors and battery systems.
Originalsprache | englisch |
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Seiten (von - bis) | 3155-3160 |
Seitenumfang | 6 |
Fachzeitschrift | ChemElectroChem |
Jahrgang | 8 |
Ausgabenummer | 16 |
DOIs | |
Publikationsstatus | Veröffentlicht - 13 Aug. 2021 |
ASJC Scopus subject areas
- Allgemeine Materialwissenschaften
- Katalyse
- Elektrochemie
Fields of Expertise
- Advanced Materials Science
Treatment code (Nähere Zuordnung)
- Basic - Fundamental (Grundlagenforschung)