NANOCOMPOSITES BASED ON FOSSIL COAL MATRICES FILLED WITH PARTICLES OF IRON-PLATINUM NANOALLOYS

In the work by complex methods of X-ray diffraction (both phase and structural) and elemental analyses it was established that at synthesis of Fe-Pt nanoalloys particles by co-reduction of metals from precursors solutions by alkaline solution with hydrazine hydrate there was formation of Fe-Pt nanoparticles of solid solution with FCC structure, iron content about 21 at.%, size about 6 nm. High-resolution transmission electron microscopy shows that in addition there were smaller particles (2-4 nm) with high iron content samples. At heating in vacuum up to 800 °С by the method of XRD in-situ it was revealed successive phase transformations of the initial sample, leading to the formation of FePt ordered intermetallic phase with the structure L10, the degree of structural ordering is 0.90±0.01. Taking into account the revealed in the work structural-phase features of Fe-Pt nanoalloys, nanostructured composites Fe-Pt/C were obtained. As a carbon matrix (carbon carrier) carbonized fossil coals of different metamorphism degrees (anthracite, sapropelic coal) were used. By the method of low-temperature nitrogen sorption in couple with the small-angle X-ray scattering it was shown that in the case of Fe-Pt/C composites on carbonized anthracite, Fe-Pt nanoalloy particles predominantly were on the surface of the carbon carrier, while in the case of sapropelic coal matrix, predominantly the mesopores of the carbon carrier were decorated by the filler particles. By the method of cyclic voltammetry, it was found that at formation of electrode materials of supercapacitors on the basis of the chosen carbon matrixes the increase in capacity relative to capacity of initial carbon matrixes in 2.65 and 3.12 times for composites Fe-Pt/C on the basis of matrixes received from anthracite and sapropelite, respectively, was observed. For citation: Popova A.N., Simenyuk G.Yu., Zakharov N.S., Pugachev V.M., Dodonov V.G., Zykov I.Yu. Nanocomposites based on fossil coal matrices filled with particles of iron-platinum nanoalloys. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 9. P. 35-42. DOI: 10.6060/ivkkt.20256809.6y.