The structural, magnetic and adsorption properties of ferromagnetic biocarbon materials

Ptashnyk, Vadym; Bordun, Ihor; Malovanyy, Myroslav; Chumakevych, V.; Borisyuk, A.; Bilenka, O. B.

doi:10.32846/2306-9716/2020.eco.2-29.1.6

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“…In addition, all diffractograms show a number of small peaks of crystalline phases, which are most likely associated with impurity elements present in the initial raw material. In the work [39], it was established that the raw materials (beet pulp and corn stalks) do not contain Fe 3 O 4 magnetite particles. Therefore, they are introduced into the carbon structure during activation with ferric chloride.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Electrochemical Properties of Fe3O4/C Nanocomposites for Symmetric Supercapacitors

Bordun,

Szymczykiewicz

2024

Applied Sciences

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In the work, nanostructured Fe3O4/C composites based on natural raw materials (beet pulp and corn stalks) are synthesised in various ways. Iron chloride FeCl3 is used as an activator. The synthesised composites are investigated using the following methods, scanning electron microscopy, X-ray diffractometry, nitrogen adsorption/desorption porometry, magnetometry, impedance and galvanostatic measurements. The presence of nanosized Fe3O4 magnetite in the synthesised carbon structures is disclosed. Based on the magnetic measurements, the particle size of Fe3O4 is on average 50 nm for the sample of the composite synthesised from beet pulp in one step, 30 nm for the sample of the composite synthesised from beet pulp in two steps, 33 nm for the composite synthesised from corn stalks in one step, and 29 nm for the composite synthesised from corn stalks in two steps. It is shown that the two-step synthesis using pre-carbonised raw materials gives the specific capacitance of the composite made with beet pulp at 96 F/g, and for the composite made with corn stalks at 95 F/g. The high coulombic efficiency (>95%) and the stability of the electrical capacitance during long-term cycling make it possible to use Fe3O4/C composites for the manufacture of supercapacitor electrodes with aqueous electrolytes.

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Section: Resultsmentioning

confidence: 99%