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Prussian Blue Analogues as Positive Electrodes for Mg Batteries: Insights into Mg 2+ Intercalation.
- Source :
-
ChemSusChem [ChemSusChem] 2024 Mar 08; Vol. 17 (5), pp. e202301224. Date of Electronic Publication: 2023 Nov 30. - Publication Year :
- 2024
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Abstract
- Potassium manganese hexacianoferrate has been prepared by co-precipitation from manganese (II) chloride and potassium citrate, with chemical analysis yielding the formula K <subscript>1.72</subscript> Mn[Fe(CN) <subscript>6</subscript> ] <subscript>0.92</subscript> □ <subscript>0.08</subscript> ⋅ 1.1H <subscript>2</subscript> O (KMnHCF). Its X-ray diffraction pattern is consistent with a monoclinic structure (space group P 2 <subscript>1</subscript> /n, no. 14) with cell parameters a=10.1202(6)Å, b=7.2890(5)Å, c=7.0193(4)Å, and β=89.90(1)°. Its redox behavior has been studied in magnesium containing electrolytes. Both K <superscript>+</superscript> ions deintercalated from the structure upon oxidation and contamination with Na <superscript>+</superscript> ions coming from the separator were found to interfere in the electrochemical response. In the absence of alkaline ions, pre-oxidized manganese hexacianoferrate showed reversible magnesium intercalation, and the process has been studied by operando synchrotron X-ray diffraction. The location of Mg <superscript>2+</superscript> ions in the crystal structure was not possible with the available experimental data. Still, density functional theory simulations indicated that the most favorable position for Mg <superscript>2+</superscript> intercalation is at 32f sites (considering a pseudo cubic F m-3m phase), which are located between 8c and Mn sites.<br /> (© 2023 The Authors. ChemSusChem published by Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1864-564X
- Volume :
- 17
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 37917571
- Full Text :
- https://doi.org/10.1002/cssc.202301224