Please use this identifier to cite or link to this item: doi:10.22028/D291-32621
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Title: Persistent and reversible solid iodine electrodeposition in nanoporous carbons
Author(s): Prehal, Christian
Fitzek, Harald
Kothleitner, Gerald
Presser, Volker
Gollas, Bernhard
Freunberger, Stefan A.
Abbas, Qamar
Language: English
Title: Nature Communications
Volume: 11
Issue: 1
Publisher/Platform: SpringerNature
Year of Publication: 2020
Publikation type: Journal Article
Abstract: Aqueous iodine based electrochemical energy storage is considered a potential candidate to improve sustainability and performance of current battery and supercapacitor technology. It harnesses the redox activity of iodide, iodine, and polyiodide species in the confined geometry of nanoporous carbon electrodes. However, current descriptions of the electrochemical reaction mechanism to interconvert these species are elusive. Here we show that electrochemical oxidation of iodide in nanoporous carbons forms persistent solid iodine deposits. Confinement slows down dissolution into triiodide and pentaiodide, responsible for otherwise significant self-discharge via shuttling. The main tools for these insights are in situ Raman spectroscopy and in situ small and wide-angle X-ray scattering (in situ SAXS/WAXS). In situ Raman confirms the reversible formation of triiodide and pentaiodide. In situ SAXS/WAXS indicates remarkable amounts of solid iodine deposited in the carbon nanopores. Combined with stochastic modeling, in situ SAXS allows quantifying the solid iodine volume fraction and visualizing the iodine structure on 3D lattice models at the sub-nanometer scale. Based on the derived mechanism, we demonstrate strategies for improved iodine pore filling capacity and prevention of self-discharge, applicable to hybrid supercapacitors and batteries.
DOI of the first publication: 10.1038/s41467-020-18610-6
URL of the first publication: https://www.nature.com/articles/s41467-020-18610-6
Link to this record: hdl:20.500.11880/29986
http://dx.doi.org/10.22028/D291-32621
ISSN: 2041-1723
Date of registration: 10-Nov-2020
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:Die Universitätsbibliographie

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