fig2

From: Self-limited atomic-layer tin-sulfides with high-electron-intensity interface induced ultrathin SEI for fast-charging sodium-ion batteries

Self-limited atomic-layer tin-sulfides with high-electron-intensity interface induced ultrathin SEI for fast-charging sodium-ion batteries

Figure 2. The characterization of chemical bond between SnS₂ and graphene. (A) The S 2p high-resolution XPS and (B) FT-IR spectra of 1L-SnS₂/Gr, 2L-SnS₂/Gr, 3L-SnS₂/Gr and SnS₂ (Gr); (C) The EXAFS; (D) XANES curves; (E) Wavelet transform images of 1L-SnS₂/Gr, 2L-SnS₂/Gr, 3L-SnS₂/Gr and Sn metal; (F) Calculated formation energies of 1L-SnS₂/Gr, 2L-SnS₂/Gr, 3L-SnS₂/Gr, 4L-SnS₂/Gr, 5L-SnS₂/Gr. Inset: Differential charge densities of relative models. Yellow and cyan isosurfaces show electron gain and loss (0.003 Bohr^-3), respectively; (G) Surface stress and strain of SnS₂ and nL-SnS₂/Gr with different layers. XPS: X-ray photoelectron spectroscopy; FT-IR: fourier transform infrared; EXAFS: extended X-ray absorption fine structure; XANES: X-ray absorption near edge structure.