In situ monitoring redox processes in energy storage using UV–Vis spectroscopy

Danzhen Zhang, Ruocun (John) Wang, Xuehang Wang () and Yury Gogotsi ()
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Danzhen Zhang: A. J. Drexel Nanomaterials Institute, and Department of Materials Science and Engineering, Drexel University
Ruocun (John) Wang: A. J. Drexel Nanomaterials Institute, and Department of Materials Science and Engineering, Drexel University
Xuehang Wang: A. J. Drexel Nanomaterials Institute, and Department of Materials Science and Engineering, Drexel University
Yury Gogotsi: A. J. Drexel Nanomaterials Institute, and Department of Materials Science and Engineering, Drexel University

Nature Energy, 2023, vol. 8, issue 6, 567-576

Abstract: Abstract Understanding energy storage mechanisms in electrochemical energy storage devices lays the foundations for improving their energy and power density. Here we introduce in situ ultraviolet–visible (UV–Vis) spectroscopy method to distinguish battery-type, pseudocapacitive and electrical double-layer charge storage processes. On the basis of Ti3C2Tx MXene in aqueous acidic and neutral electrolytes, and lithium titanium oxide in an organic electrolyte, we found a correlation between the evolution of UV–Vis spectra and the charge storage mechanism. The electron transfer number for Ti3C2Tx in an acidic electrolyte was calculated using quantitative analysis, which was close to previous measurements using X-ray absorption spectroscopy. Further, we tested the methodology to distinguish the non-Faradaic process in Ti3C2Tx MXene in a water-in-salt electrolyte, despite well-defined peaks in cyclic voltammograms. In situ UV–Vis spectroscopy is a fast and cost-effective technique that effectively supplements electrochemical characterization to track changes in oxidation state and materials chemistry and determine the charge storage mechanism.

Date: 2023
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DOI: 10.1038/s41560-023-01240-9

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