FeS<sub>2</sub> Nanoparticles in S-Doped Carbon: Ageing Effects on Performance as a Supercapacitor Electrode
Although transition metal sulfides have prodigious potential for use as electrode materials because of their low electronegativities, their large volume changes inhibit broad application. Moreover, there is only limited knowledge of the ageing processes of these materials at the nanoscale. Herein, n...
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MDPI AG
2023-11-01
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| Online Access: | https://www.mdpi.com/2311-5629/9/4/112 |
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| author | Sirine Zallouz Bénédicte Réty Jean-Marc Le Meins Mame Youssou Ndiaye Philippe Fioux Camélia Matei Ghimbeu |
| author_facet | Sirine Zallouz Bénédicte Réty Jean-Marc Le Meins Mame Youssou Ndiaye Philippe Fioux Camélia Matei Ghimbeu |
| author_sort | Sirine Zallouz |
| collection | DOAJ |
| description | Although transition metal sulfides have prodigious potential for use as electrode materials because of their low electronegativities, their large volume changes inhibit broad application. Moreover, there is only limited knowledge of the ageing processes of these materials at the nanoscale. Herein, nano-C/FeS<sub>2</sub> materials were prepared via one-pot syntheses from green biodegradable carbon precursors, followed by activation and sulfidation. The increased activation/sulfidation time led to an increase in the size of the nanoparticles (7 to 17 nm) and their aggregation, as well as in an increase in the specific surface area. The materials were then used as electrodes in 2-electrode symmetric supercapacitors with 2 M KOH. The activation process resulted in improved capacitance (60 F g<sup>−1</sup> at 0.1 A g<sup>−1</sup>) and rate capability (36%) depending on the composite porosity, conductivity, and size of the FeS<sub>2</sub> particles. The ageing of the FeS<sub>2</sub> nanoparticles was investigated under air, and a progressive transformation of the nano-FeS<sub>2</sub> into hydrated iron hydroxy sulfate with a significant morphological modification was observed, resulting in drastic decreases in the capacitance (70%) and retention. In contrast, the ageing of nano-FeS<sub>2</sub> during cycling led to the formation of a supplementary iron oxyhydroxide phase, which contributed to the enhanced capacitance (57%) and long-term cycling (132% up to 10,000 cycles) of the device. |
| first_indexed | 2024-03-08T20:54:48Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2311-5629 |
| language | English |
| last_indexed | 2024-03-08T20:54:48Z |
| publishDate | 2023-11-01 |
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| record_format | Article |
| series | C |
| spelling | doaj.art-7d404093421749bb9899428bc47fe2bf2023-12-22T13:59:17ZengMDPI AGC2311-56292023-11-019411210.3390/c9040112FeS<sub>2</sub> Nanoparticles in S-Doped Carbon: Ageing Effects on Performance as a Supercapacitor ElectrodeSirine Zallouz0Bénédicte Réty1Jean-Marc Le Meins2Mame Youssou Ndiaye3Philippe Fioux4Camélia Matei Ghimbeu5CNRS, Institut de Science des Matériaux de Mulhouse (IS2M) UMR 7361, Université de Haute-Alsace, F-68100 Mulhouse, FranceCNRS, Institut de Science des Matériaux de Mulhouse (IS2M) UMR 7361, Université de Haute-Alsace, F-68100 Mulhouse, FranceCNRS, Institut de Science des Matériaux de Mulhouse (IS2M) UMR 7361, Université de Haute-Alsace, F-68100 Mulhouse, FranceCNRS, Institut de Science des Matériaux de Mulhouse (IS2M) UMR 7361, Université de Haute-Alsace, F-68100 Mulhouse, FranceCNRS, Institut de Science des Matériaux de Mulhouse (IS2M) UMR 7361, Université de Haute-Alsace, F-68100 Mulhouse, FranceCNRS, Institut de Science des Matériaux de Mulhouse (IS2M) UMR 7361, Université de Haute-Alsace, F-68100 Mulhouse, FranceAlthough transition metal sulfides have prodigious potential for use as electrode materials because of their low electronegativities, their large volume changes inhibit broad application. Moreover, there is only limited knowledge of the ageing processes of these materials at the nanoscale. Herein, nano-C/FeS<sub>2</sub> materials were prepared via one-pot syntheses from green biodegradable carbon precursors, followed by activation and sulfidation. The increased activation/sulfidation time led to an increase in the size of the nanoparticles (7 to 17 nm) and their aggregation, as well as in an increase in the specific surface area. The materials were then used as electrodes in 2-electrode symmetric supercapacitors with 2 M KOH. The activation process resulted in improved capacitance (60 F g<sup>−1</sup> at 0.1 A g<sup>−1</sup>) and rate capability (36%) depending on the composite porosity, conductivity, and size of the FeS<sub>2</sub> particles. The ageing of the FeS<sub>2</sub> nanoparticles was investigated under air, and a progressive transformation of the nano-FeS<sub>2</sub> into hydrated iron hydroxy sulfate with a significant morphological modification was observed, resulting in drastic decreases in the capacitance (70%) and retention. In contrast, the ageing of nano-FeS<sub>2</sub> during cycling led to the formation of a supplementary iron oxyhydroxide phase, which contributed to the enhanced capacitance (57%) and long-term cycling (132% up to 10,000 cycles) of the device.https://www.mdpi.com/2311-5629/9/4/112C/pyrite compositeCO<sub>2</sub> activationmesoporous carbonenergy storageageingsulfidation |
| spellingShingle | Sirine Zallouz Bénédicte Réty Jean-Marc Le Meins Mame Youssou Ndiaye Philippe Fioux Camélia Matei Ghimbeu FeS<sub>2</sub> Nanoparticles in S-Doped Carbon: Ageing Effects on Performance as a Supercapacitor Electrode C C/pyrite composite CO<sub>2</sub> activation mesoporous carbon energy storage ageing sulfidation |
| title | FeS<sub>2</sub> Nanoparticles in S-Doped Carbon: Ageing Effects on Performance as a Supercapacitor Electrode |
| title_full | FeS<sub>2</sub> Nanoparticles in S-Doped Carbon: Ageing Effects on Performance as a Supercapacitor Electrode |
| title_fullStr | FeS<sub>2</sub> Nanoparticles in S-Doped Carbon: Ageing Effects on Performance as a Supercapacitor Electrode |
| title_full_unstemmed | FeS<sub>2</sub> Nanoparticles in S-Doped Carbon: Ageing Effects on Performance as a Supercapacitor Electrode |
| title_short | FeS<sub>2</sub> Nanoparticles in S-Doped Carbon: Ageing Effects on Performance as a Supercapacitor Electrode |
| title_sort | fes sub 2 sub nanoparticles in s doped carbon ageing effects on performance as a supercapacitor electrode |
| topic | C/pyrite composite CO<sub>2</sub> activation mesoporous carbon energy storage ageing sulfidation |
| url | https://www.mdpi.com/2311-5629/9/4/112 |
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