The Fe<sup>4+/3+</sup> Redox Mechanism in NaFeO<sub>2</sub>

A Simultaneous Operando Nuclear Resonance and X-ray Scattering Study

Journal article (2020)

Authors

M. Fehse RST/Storage of Electrochemical Energy - AS , ENS-PSL Research University & CNRS
Dimitrios Bessas ESRF The European Synchrotron, Grenoble
Abdelfattah Mahmoud Forschungszentrum Jülich, Université de Liège
Aliou Diatta ENS-PSL Research University & CNRS
Raphael P. Hermann Forschungszentrum Jülich, Oak Ridge National Laboratory
Lorenzo Stievano ENS-PSL Research University & CNRS
Moulay T. Sougrati ENS-PSL Research University & CNRS
Research Group
RST/Storage of Electrochemical Energy (AS) (TU Delft)
Mössbauer Spectroscopy MCR-ALS Chemometrics Nuclear Forward Scattering Sodium Ion Batteries
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Storage of Electrochemical Energy

Abstract

Simultaneous operando Nuclear Forward Scattering and transmission X-ray diffraction and 57Fe Mössbauer spectroscopy measurements were carried out in order to investigate the electrochemical mechanism of NaFeO2 vs. Na metal using a specifically designed in situ cell. The obtained data were analysed using an alternative and innovative data analysis approach based on chemometric tools such as Principal Component Analysis (PCA) and Multivariate Curve Resolution - Alternating Least Squares (MCR-ALS). This approach, which allows the unbiased extraction of all possible information from the operando data, enabled the stepwise reconstruction of the independent “real” components permitting the description of the desodiation mechanism of NaFeO2. This wealth of information allows a clear description of the electrochemical reaction at the redox-active iron centres, and thus an improved comprehension of the cycling mechanisms of this material vs. sodium.