Solid-state synthesis of diminutively granular and highly crystalline manganese hexacyanoferrate for a supercapacitor electrode

Abstract

Supercapacitors are considered as promising energy storage devices due to their high power density, fast charging/discharging process and long cycle life. The synthesis of Prussian blue analogues (PBAs) by traditional...

Exploring Zinc-Doped Manganese Hexacyanoferrate as Cathode for Aqueous Zinc-Ion Batteries

“…Figure 2a shows the diffractograms obtained for the synthesised samples together with the theoretical positions of the main diffraction peaks for the cubic (space group: Fm-3m) and rhombohedral (space group: R-3c) structures. Using the coprecipitation synthesis route, in the case of the manganese sample (Mn100), the diffraction peaks are well-defined and sharp and the diffraction pattern matches with the cubic structure, in good agreement with the structure reported by other authors in the literature [33][34][35][36][37]. The diffraction pattern of the Zn100 sample fits a rhombohedral/hexagonal structure (R-3c), as has been described in the bibliography [35,38,39], and no impurities are observable.…”

“…Going on with the structural study, the analysis and interpretation of the FTIR spectra presented in Figure 2b have been carried out [42][43][44]. The recorded spectra show one major signal in the 3700-3000 cm −1 range related to the H2O bands (H-O tensile vibration peaks), typical of these compounds [34]. This indicates the presence of water molecules, surely on the surface and even in the open sites of the structure of the compounds.…”