Formation of hierarchical Fe7Se8 nanorod bundles with enhanced sodium storage properties

Two-Dimensional Room-Temperature Magnetic Nonstoichiometric Fe7Se8 Nanocrystals: Controllable Synthesis and Magnetic Behavior

“…As for FeSe, only the peaks of Fe 2+ exist, so the XPS results also confirm the successful formation of Fe 7 Se 8 . In the Se 3d spectrum (Figure S5), the chemical states of Se 3d 3/2 and 3d 5/2 can be identified from the peaks at the binding energies of 55.9 and 54.5 eV, respectively, which are consistent with the literature …”

“…In the Se 3d spectrum (Figure S5), the chemical states of Se 3d 3/2 and 3d 5/2 can be identified from the peaks at the binding energies of 55.9 and 54.5 eV, respectively, which are consistent with the literature. 31 Raman spectra were characterized to investigate the phonon vibration of Fe 7 Se 8 . Figure 1g shows the typical Raman spectrum of Fe 7 Se 8 with three peaks at ∼177.7 cm −1 , ∼ 214.8 cm −1 , and ∼251.7 cm −1 , respectively, which are consistent with the calculation results.…”

Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

“…Theoretically, compared with metal oxides and sulfides, transition-metal selenides (TMSs) exhibit higher diffusion kinetics (1 × 10 −5 S•m −1 ) of ions and higher conductivity (1 × 10 −3 S•m −1 ), which is in favor of working stability and reliability in SCs and SIBs [3]. What's more, considering that sodium dendrite problem will not occur in the low voltage range, the metal selenide can reduce the potential safety hazard of batteries [4]. Hence, there are many stimulating successive exploration and studies on selenide-based electrode materials (e.g., CoSe2 [5], NiSe2 [6], NiCo2Se4 [7], Fe2CoSe4 [8], etc.)…”

Fe7Se8 encapsulated in N-doped carbon nanofibers as a stable anode material for sodium ion batteries

“…As shown in Table S1, † the research of Fe 7 Se 8 -NCFs for sodium storage exhibits stable electrochemical performance. 29 Furthermore, Fig. 4e shows the long-term cycling stability of Fe 7 Se 8 -NCFs with a specific capacity of 148 mA h g −1 after 2000 cycles, which is more stable than those of Fe 7 Se 8 and NCFs (the current density: 2 A g −1 ).…”

“…The promising rate performance of Fe 7 Se 8 -NCFs could attribute to the 1D carbon nanofibers, which can shorten the ion diffusion pathway to facilitate Na + transportation. As shown in the Table S1, the research of Fe 7 Se 8 -NCFs for sodium storage exhibits stable electrochemical performance [29]. Furthermore, Figure 4e shows the long-term cycling stability of Fe 7 Se 8 -NCFs with the specific capacity of 148 mAh g -1 after 2000 cycles, which is more stable than those of Fe 7 Se 8 and NCFs (the current density: 2 A g -1 ).…”