Characterization of electrochemical processes in metal−organic batteries by X-ray Raman spectroscopy

Rajh, Ava (author), Arčon, Iztok (author), Bučar, Klemen (author), Žitnik, Matjaž (author), Petric, Marko (author), Vižintin, Alen (author), Bitenc, Jan (author), Košir, Urban (author), Dominko, Robert (author), Gretarsson, Hlynur (author), Sundermann, Martin (author), Kavčič, Matjaž (author)

X-ray Raman spectroscopy (XRS) is an emerging spectroscopic technique that utilizes inelastic scattering of hard Xrays to study X-ray absorption edges of low Z elements in bulk material. It was used to identify and quantify the amount of carbonyl bonds in a cathode sample, in order to track the redox reaction inside metal−organic batteries during the charge/discharge cycle. XRS was used to record the oxygen K-edge absorption spectra of organic polymer cathodes from different multivalent metal−organic batteries. The amount of carbonyl bond in each sample was determined by modeling the oxygen K-edge XRS spectra with the linear combination of two reference compounds that mimicked the fully charged and the fully discharged phases of the battery. To interpret experimental XRS spectra, theoretical calculations of oxygen K-edge absorption spectra based on density functional theory were performed. Overall, a good agreement between the amount of carbonyl bond present during different stages of battery cycle, calculated from linear combination of standards, and the amount obtained from electrochemical characterization based on measured capacity was achieved. The electrochemical mechanism in all studied batteries was confirmed to be a reduction of double carbonyl bond and the intermediate anion was identified with the help of theoretical calculations. X-ray Raman spectroscopy of the oxygen K-edge was shown to be a viable characterization technique for accurate tracking of the redox reaction inside metal−organic batteries.

• Language: English
• Keywords: X-ray Raman spectroscopy, meta-organic batteries, oxygen K-edge XANES, electrochemical processes, batteries, carbonyls, electrochemical cells, electrodes, oxygen
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics; FKKT - Faculty of Chemistry and Chemical Technology
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: Str. 5435-5442
• Numbering: Vol. 126, iss. 12
• PID: 20.500.12556/RUL-140628
• UDC: 53
• ISSN on article: 1932-7455
• DOI: 10.1021/acs.jpcc.1c10622
• COBISS.SI-ID: 102127363
• Publication date in RUL: 16.09.2022

Record is a part of a journal

• Title: Journal of physical chemistry. C
• Shortened title: J. phys. chem. C
• Publisher: American Chemical Society
• ISSN: 1932-7455
• COBISS.SI-ID: 513576217

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• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
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