Electrospun Fe1-xS@nitrogen-doped carbon fibers as anode material for sodium-ion batteries

Breaking through the pH Limitation of Fe1–xS Nanozymes Using Component-Modulated Coupled Nanoclay

“…The HRTEM image of Fe 1−x S in Figure S2 showed that lattice fringes with interplanar spacings of 0.17 and 0.29 nm could be observed, attributed to the (220) and (200) planes of Fe 1−x S, 24,25 respectively, demonstrating the successful preparation of Fe 1−x S. In Figure 1c, face spacings of 0.30 and 0.26 nm for Fe 1−x S/MK10 are attributed to the (200) and (207) planes of Fe 1−x S, respectively. 26,27 This demonstrated the successful synthesis of Fe 1−x S nanosheets as well as the successful anchored growth of Fe 1−x S on the MK10 surface. Furthermore, the energy-dispersive spectroscopy (EDS) elemental mapping images revealed a uniform distribution of Fe, S, O, Si, and Al elements in Fe 1−x S/ MK10 (Figure S3).…”

“…The morphology of Fe 1– x S/MK10 (Figure b) exhibited a scattered distribution of smaller-size nanosheets on a larger lamellar structure, indicating that MK10 as a carrier effectively reduced the agglomeration tendency of Fe 1– x S. Figures c and S2 exhibit transmission electron microscopy (TEM) images and high-resolution transmission electron microscopy (HRTEM) images of Fe 1– x S/MK10 and Fe 1– x S, respectively. The HRTEM image of Fe 1– x S in Figure S2 showed that lattice fringes with interplanar spacings of 0.17 and 0.29 nm could be observed, attributed to the (220) and (200) planes of Fe 1– x S, , respectively, demonstrating the successful preparation of Fe 1– x S. In Figure c, face spacings of 0.30 and 0.26 nm for Fe 1– x S/MK10 are attributed to the (200) and (207) planes of Fe 1– x S, respectively. , This demonstrated the successful synthesis of Fe 1– x S nanosheets as well as the successful anchored growth of Fe 1– x S on the MK10 surface. Furthermore, the energy-dispersive spectroscopy (EDS) elemental mapping images revealed a uniform distribution of Fe, S, O, Si, and Al elements in Fe 1– x S/MK10 (Figure S3).…”

“…The presence of SO x may be due to the oxidation reaction between the active surface of the sample and the adsorbed air. 26 Interestingly, only very weak characteristic peaks of SO x were observed in Fe 1−x S/ MK10, suggesting that the introduction of M10 had increased the stability of Fe 1−x S. Besides, the characteristic peak position of S 2p of Fe 1−x S/MK10 was also shifted by 0.6 eV toward lower binding energy. Furthermore, the percentage of S(II−) surface species increased from 11.83% to 35.83% after M10 was added, while S(II−) species acted as an electron donor in converting Fe(III) to Fe(II).…”

“…For high-resolution S 2p spectra of Fe 1– x S (Figure f), the characteristic peaks located at 161.12, 162.07, 163.65, and 164.89 eV were assigned to S­(II−) surface , S­(II−) lattice , S­(I−), and S n 2– , respectively. ,, The characteristic peak observed at 168.43 eV can be attributed to oxidized groups (SO x ). The presence of SO x may be due to the oxidation reaction between the active surface of the sample and the adsorbed air . Interestingly, only very weak characteristic peaks of SO x were observed in Fe 1– x S/MK10, suggesting that the introduction of M10 had increased the stability of Fe 1– x S. Besides, the characteristic peak position of S 2p of Fe 1– x S/MK10 was also shifted by 0.6 eV toward lower binding energy.…”

Synergistic V5S8/CoS nanoparticles-embedded carbon nanofiber as binder-free flexible anode for sodium-ion batteries

“…The electrolyte used was 1 M NaPF 6 in diglyme (100 vol%). To ensure proper wetting of the separator, newly installed batteries were left undisturbed for 8-12 h before testing [23] .…”