Electron energy loss spectra of Na0.33CoO2.yH2O (y = 0, 0.6 and 1.3)

TL;DR

This study investigates how water intercalation affects the electron energy loss spectra and electronic structure of Na0.33CoO2 with varying hydration levels, revealing systematic spectral changes and valence state variations.

Contribution

It provides new insights into the hydration-dependent electronic structure and plasmon resonance in Na0.33CoO2·yH2O through detailed EEL spectral analysis.

Findings

Spectral features change systematically with water content.

Water intercalation influences Co valence states.

Electronic structure varies during hydration.

Abstract

Electron energy loss (EEL) spectra have been obtained on materials with the nominal compositions of Na0.33CoO2_yH2O (y = 0, 0.6 and 1.3). Spectral analyses revealed systematic changes in the low-loss energy region (< 10eV) and the core losses(O-K, Co-L3,2) along with the water intercalation. The inter (intra)-band transitions and the relevant plasmon resonance were found to be sensitive to water content. Variations of the electronic structure and the Co valence states during hydration have been discussed based on our experimental results.