Self-templated hollow nanospheres of B-site engineered non-stoichiometric perovskite for supercapacitive energy storage via anion-intercalation mechanism
| Autor: | Jae-Jin Shim, Iftikhar Hussain, Young-Il Kim, Umer Javed, Dirk Tuma, Van Quang Nguyen, Sarmad Iqbal, P. Muhammed Shafi, A.H. Mady |
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| Rok vydání: | 2021 |
| Předmět: |
Ostwald ripening
Supercapacitor Materials science 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Energy storage 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials symbols.namesake Colloid and Surface Chemistry Chemical engineering Electrode symbols Cyclic voltammetry 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of Colloid and Interface Science. 600:729-739 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2021.03.147 |
| Popis: | The continual increase in energy demand and inconsistent supply have attracted attention towards sustainable energy storage/conversion devices, such as electrochemical capacitors with high energy densities and power densities. Perovskite oxides have received significant attention as anion-intercalation electrode materials for electrochemical capacitors. In this study, hollow nanospheres of non-stoichiometric cubic perovskite fluorides, KNi1−xCoxF3−δ (x = 0.2; δ = 0.33) (KNCF-0.2) have been synthesized using a localized Ostwald ripening. The electrochemical performance of the non-stoichiometric perovskite has been studied in an aqueous 3 M KOH electrolyte to categorically investigate the fluorine-vacancy-mediated charge storage capabilities. High capacities up to 198.55 mA h g−1 or 714.8 C g−1 (equivalent to 1435 F g−1) have been obtained through oxygen anion-intercalation mechanism (peroxide pathway, O - ). The results have been validated using ICP (inductively coupled plasma mass spectrometry) analysis and cyclic voltammetry. An asymmetric supercapacitor device has been fabricated by coupling KNCF-0.2 with activated carbon to deliver a high energy density of 40 W h kg−1 as well as excellent cycling stability of 98% for 10,000 cycles. The special attributes of hollow-spherical, non-stoichiometric perovskite (KNCF-0.2) have exhibited immense promise for their usability as anion-intercalation type electrodes in supercapacitors. |
| Databáze: | OpenAIRE |
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