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Title:Characterization of electrochemical processes in metal-organic batteries by X-ray Raman spectroscopy
Authors: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)
Work type:Unknown ()
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract: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.
Keywords:X-ray Raman spectroscopy, meta-organic batteries, oxygen K-edge XANES, electrochemical processes
Year of publishing:2022
Number of pages:str. 1-8
Numbering:iss. , Vol.
COBISS_ID:102127363 Link is opened in a new window
ISSN on article:1932-7455
DOI:10.1021/acs.jpcc.1c10622 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
Categories:Document is not linked to any category.
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Record is a part of a journal

Title:Journal of physical chemistry
Shortened title:J. phys. chem. C,
Publisher:American Chemical Society
COBISS.SI-ID:513576217 New window