Synthesis and characterization of defective PBAs electrode material

Khan, Anastassiya (2020) Synthesis and characterization of defective PBAs electrode material. [Laurea magistrale], Università di Bologna, Corso di Studio in Chimica industriale [LM-DM270]
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Sodium manganese hexacyanoferrate (NaMnHCF) and its derivatives have been synthesized by simple co-precipitation method with addition of the citric and ascorbic acids respectively. The correspondent crystal structure, water content, chemical formula and a deep structural investigation of prepared samples have been performed by means of the combination of the laboratory and synchrotron techniques (PXRD, FT-IR, TGA, MP-AES and XAS). Electrochemical tests have been done using three-electrode system in sodium nitrate solution at different concentration. From cyclic voltammetry curves, Fe3+/2+ redox peak has been observed, whereas Mn3+/2+ peak was not always evident. Structural stability of the cycled samples has then been tested using 2D XRF imaging and Transmission X-ray microscopy (TXM) techniques. The intercalation of NaMnHCF after 20 cycles has been found by micro-XANES analysis of the highlighted spots which have been found in the XRF images. TXM has also confirmed the appearance of the intercalated particles after 50 cycles comparing the spectra between charged and discharged materials at three different edges (Mn, Fe and N). However, by comparison with lithium samples, it seems obvious that sodium samples are more homogeneous and intercalation is at the very beginning indicating the relative structural stability of sodium manganese hexacyanoferrate electrode material.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Khan, Anastassiya
Relatore della tesi
Correlatore della tesi
Corso di studio
Advanced Spectroscopy in Chemistry
Ordinamento Cds
Parole chiave
prussian blue sodium ion batteries XAS TXM XRF cathode materials XRD synchrotron techniques
Data di discussione della Tesi
20 Luglio 2020

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