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Nanomaterials 2022, 12, 984 5 of 11 Nanomaterials 2022, 12, 984 material in an inert atmosphere to prevent the oxidation reaction with H+/Na+ or water upon exposure to air. To determine the size and morphological structure, the as-synthesized NFM, NFM/C-1, NFM/C-2, and NFM/C-3 materials were analyzed by FE-SEM; the images obtained are shown in Figure 3. All the materials obtained irregular morphologies with a size between 3 and 5 μm. Figure 3b,c shows the FE-SEM image of NFM nanocomposite, which reveals the irregular shape of the material. The magnified image shows that the surface of the material is smooth with no observed agglomerations. Figure 3 shows the FE-SEM images of the NFM/C-1 (Figure 3d,e), NFM/C-2 (Figure 3f,g), and NFM/C- 3 (Figure 3h,i) materials, respectively. In the NFM/C-2 and NFM/C-3 nanocomposite materials, the carbon particles are present in the surface cavities of the NFM material. Because the weight percentage of the carbon material is lower in the NFM/C-1 composite material, the surface of the material is similar to that of the bare NFM material. The 6 of 12 solid-state method followed by calcination produces NFM/carbon nanocomposite. Figure33..XXRDRDpapttaetrtnesr(nas)f(oar)afso-prraesp-aprreedpNaFreMd,NFM/C,N-1,FNMF/MC/C-1-2,,NanFdMN/FCM-2/C,-a3nmdaNterFiMals/.FCE--3materials.FE- SEM images at various magnifications: (b,c) NFM, (d,e) NFM/C-1, (f,g) NFM/C-2, and (h,i) NFM/C- SEM images at various magnifications: (b,c) NFM, (d,e) NFM/C-1, (f,g) NFM/C-2, and (h,i) NFM/C- 3 materials, respectively. 3 materials, respectively. To confirm the formation of the NFM/C composite, the NFM/C-2 material was char- acterized by FE-TEM equipped with dual SDD-type EDS mapping. Figure 4 presents the FE-TEM image with the elemental distribution and EDS mapping spectra of the NFM/C-2 material. Figure 4a shows the FE-TEM image of the NFM/C-2 material, while Figure 4b–f shows the elemental distributions of Na, Fe, Mn, O, and C elements, respectively. The elemental distributions indicate that all elements are evenly distributed in the NFM/C-2 material. Furthermore, elemental mapping confirmed the presence of all the elements inPDF Image | NaFe0 Nanocomposite as a Cathode for Sodium-Ion Batteries
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