Structural and Electrical Properties of Na _X COO₂ Thermoelectric Synthesized via Citric-Nitrate Auto-Combustion Reaction

Generalized synthesis of NaCrO2 particles for high-rate sodium ion batteries prepared by microfluidic synthesis in segmented flow

“…The 23 Na solid state NMR spectrum of the pre-annealed sample (Fig. 5D black) shows a single resonance at δ = −8.01 ppm (with respect to solid NaCl), which perfectly matches to the sodium signal in NaNO 3 .…”

“…5D black) shows a single resonance at δ = −8.01 ppm (with respect to solid NaCl), which perfectly matches to the sodium signal in NaNO 3 . 36 This sharp spectral line disappears in the 23 Na-NMR spectrum of the annealed product (Fig. 5D red) which confirms the complete transform-…”

“…The published crystal structure data were used as a starting point for the Rietveld refinements. [21][22][23][24] The atom positions were held constant. Lattice parameters, anisotropic peak broadening and preferred orientation were refined.…”

“…ation of the starting product. Instead, three broad 23 Na resonances appear in the NMR spectrum indicating three new sodium environments. Measurements at different spinning frequencies were carried out to distinguish the centerband from the spinning sideband envelope (Fig.…”

“…S5), hydrodynamic radii of Tween #85 in kerosene and water from DLS (Fig. S6), 23 Na-NMR spectra of the pre-annealed sample measured at a frequency of 20 and 25 kHz and the annealed sample measured at a frequency of 20, 25 and 28 kHz to determine the satellite signals (Fig. S7).…”