RESEARCH / A0166
Coupling Se-Vacancy-Rich FeSe2/Bi2Se3 Heterojunction and Microhydration-Guided Water-in-Oil Electrolyte for Ultrahigh-Performance Hybrid-Ion Batteries
Read the original paper · 10.1021/acs.nanolett.5c05603 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 1. (a) Schematic illustration of the preparation process for FeSe2/Bi2Se3. (b) SEM image of the Fe3O4 precursor displaying a microflowerlike nanostructure. (c) SEM image of FeSe2/Bi2Se3 after selenization, showing retention of the hierarchical microflower morphology. (d) Highmagnification SEM image of FeSe2/Bi2Se3. (e, f) HRTEM image of the FeSe2/Bi2Se3 heterostructure, highlighting the heterointerface with lattice fringes assigned to FeSe2 (220) and Bi2Se3 (015) planes, and the corresponding SAED pattern showing diffraction rings. (g) XRD pattern and Rietveld refinement results confirming the phase composition of FeSe2/Bi2Se3. The inset in (g) shows the crystal structures of FeSe2 and Bi2Se3. (h) High-resolution Fe 2p XPS spectra of FeSe2/Bi2Se3 compared with the reference FeSe2. (i) Fe K-edge and (j) Bi L3-edge XANES spectra of FeSe2/ Bi2Se3. The insets correspond to the WT-EXAFS contour maps.