Charge Storage and Magnetic Properties Nitrogen-Containing Nanoporous Bio-Carbon
This article presents the technology for the preparation of a nitrogen-containing nanoporous bio-carbon and investigates its properties. It has been shown that the synthesised bio-carbon is characterised by a high degree of homogeneity, which has been confirmed by energy dispersive spectroscopy. The...
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MDPI AG
2024-02-01
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| Online Access: | https://www.mdpi.com/1996-1073/17/4/903 |
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| author | Ewelina Szymczykiewicz Ihor Bordun Vitalii Maksymych Myroslava Klapchuk Zenoviy Kohut Anatoliy Borysiuk Yuriy Kulyk Fedir Ivashchyshyn |
| author_facet | Ewelina Szymczykiewicz Ihor Bordun Vitalii Maksymych Myroslava Klapchuk Zenoviy Kohut Anatoliy Borysiuk Yuriy Kulyk Fedir Ivashchyshyn |
| author_sort | Ewelina Szymczykiewicz |
| collection | DOAJ |
| description | This article presents the technology for the preparation of a nitrogen-containing nanoporous bio-carbon and investigates its properties. It has been shown that the synthesised bio-carbon is characterised by a high degree of homogeneity, which has been confirmed by energy dispersive spectroscopy. The obtained bio-carbon has a micromesoporous structure, which has been confirmed by the results of studies using the method of low-temperature nitrogen adsorption and desorption. It was found that the specific surface area of biochar is 1247 m<sup>2</sup>/g. The data on nitrogen adsorption and desorption were compared with the data on small-angle X-ray scattering, and it was found that the micropores in the synthesised bio-carbon are open pores, while mesopores remain closed. The energy dispersion analysis showed that the structure of the bio-carbon does not contain ferromagnetic atoms, but due to the addition of nitrogen, the synthesised bio-carbon in a magnetic field has the properties of a ferromagnet with a characteristic hysteresis of the specific magnetisation. It was found that this material has a saturation magnetisation σ<sub>s</sub> of 1.4 A∙m<sup>2</sup>∙kg<sup>−1</sup> and a coercive force H<sub>c</sub> of 10 kA/m. Symmetric supercapacitors were fabricated from the synthesised bio-carbon material with 30% aqueous KOH and 1 M Na<sub>2</sub>SO<sub>4</sub> as electrolytes. It was found that for bio-carbon synthesised at 800 °C, the specific capacitance in a 30% aqueous solution of KOH is 180 F/g, and in a 1 M aqueous solution of Na<sub>2</sub>SO<sub>4</sub>, it is 124 F/g. The cyclic voltammetry of the fabricated supercapacitors at different rates of potential expansion was investigated and analysed. Impedance studies on these supercapacitors were carried out. The equivalent electrical circuits describing the electrochemical processes in the studied supercapacitors were constructed and characterised. |
| first_indexed | 2024-03-07T22:33:17Z |
| format | Article |
| id | doaj.art-187d0336eb054bfdba6646358f69debf |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-07T22:33:17Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-187d0336eb054bfdba6646358f69debf2024-02-23T15:15:23ZengMDPI AGEnergies1996-10732024-02-0117490310.3390/en17040903Charge Storage and Magnetic Properties Nitrogen-Containing Nanoporous Bio-CarbonEwelina Szymczykiewicz0Ihor Bordun1Vitalii Maksymych2Myroslava Klapchuk3Zenoviy Kohut4Anatoliy Borysiuk5Yuriy Kulyk6Fedir Ivashchyshyn7Faculty of Electrical Engineering, Czestochowa University of Technology, J. Dąbrowskiego Str. 69, 42-201 Częstochowa, PolandFaculty of Electrical Engineering, Czestochowa University of Technology, J. Dąbrowskiego Str. 69, 42-201 Częstochowa, PolandInstitute of Applied Mathematics and Fundamental Sciences, Lviv Polytechnic National University, Bandera Str. 12, 79013 Lviv, UkraineInstitute of Applied Mathematics and Fundamental Sciences, Lviv Polytechnic National University, Bandera Str. 12, 79013 Lviv, UkraineFaculty of Electrical Engineering, Czestochowa University of Technology, J. Dąbrowskiego Str. 69, 42-201 Częstochowa, PolandInstitute of Applied Mathematics and Fundamental Sciences, Lviv Polytechnic National University, Bandera Str. 12, 79013 Lviv, UkraineFaculty of Electronics and Computer Technologies, Ivan Franko Lviv National University, Universytetska Str. 1, 79005 Lviv, UkraineFaculty of Electrical Engineering, Czestochowa University of Technology, J. Dąbrowskiego Str. 69, 42-201 Częstochowa, PolandThis article presents the technology for the preparation of a nitrogen-containing nanoporous bio-carbon and investigates its properties. It has been shown that the synthesised bio-carbon is characterised by a high degree of homogeneity, which has been confirmed by energy dispersive spectroscopy. The obtained bio-carbon has a micromesoporous structure, which has been confirmed by the results of studies using the method of low-temperature nitrogen adsorption and desorption. It was found that the specific surface area of biochar is 1247 m<sup>2</sup>/g. The data on nitrogen adsorption and desorption were compared with the data on small-angle X-ray scattering, and it was found that the micropores in the synthesised bio-carbon are open pores, while mesopores remain closed. The energy dispersion analysis showed that the structure of the bio-carbon does not contain ferromagnetic atoms, but due to the addition of nitrogen, the synthesised bio-carbon in a magnetic field has the properties of a ferromagnet with a characteristic hysteresis of the specific magnetisation. It was found that this material has a saturation magnetisation σ<sub>s</sub> of 1.4 A∙m<sup>2</sup>∙kg<sup>−1</sup> and a coercive force H<sub>c</sub> of 10 kA/m. Symmetric supercapacitors were fabricated from the synthesised bio-carbon material with 30% aqueous KOH and 1 M Na<sub>2</sub>SO<sub>4</sub> as electrolytes. It was found that for bio-carbon synthesised at 800 °C, the specific capacitance in a 30% aqueous solution of KOH is 180 F/g, and in a 1 M aqueous solution of Na<sub>2</sub>SO<sub>4</sub>, it is 124 F/g. The cyclic voltammetry of the fabricated supercapacitors at different rates of potential expansion was investigated and analysed. Impedance studies on these supercapacitors were carried out. The equivalent electrical circuits describing the electrochemical processes in the studied supercapacitors were constructed and characterised.https://www.mdpi.com/1996-1073/17/4/903nitrogen-containing bio-carbonpore size distributionmagnetism of carbon materialssmall-angle X-ray scatteringimpedance spectroscopy |
| spellingShingle | Ewelina Szymczykiewicz Ihor Bordun Vitalii Maksymych Myroslava Klapchuk Zenoviy Kohut Anatoliy Borysiuk Yuriy Kulyk Fedir Ivashchyshyn Charge Storage and Magnetic Properties Nitrogen-Containing Nanoporous Bio-Carbon Energies nitrogen-containing bio-carbon pore size distribution magnetism of carbon materials small-angle X-ray scattering impedance spectroscopy |
| title | Charge Storage and Magnetic Properties Nitrogen-Containing Nanoporous Bio-Carbon |
| title_full | Charge Storage and Magnetic Properties Nitrogen-Containing Nanoporous Bio-Carbon |
| title_fullStr | Charge Storage and Magnetic Properties Nitrogen-Containing Nanoporous Bio-Carbon |
| title_full_unstemmed | Charge Storage and Magnetic Properties Nitrogen-Containing Nanoporous Bio-Carbon |
| title_short | Charge Storage and Magnetic Properties Nitrogen-Containing Nanoporous Bio-Carbon |
| title_sort | charge storage and magnetic properties nitrogen containing nanoporous bio carbon |
| topic | nitrogen-containing bio-carbon pore size distribution magnetism of carbon materials small-angle X-ray scattering impedance spectroscopy |
| url | https://www.mdpi.com/1996-1073/17/4/903 |
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