Improved supercapacitive performance of low pore size and highly stable nanostructured NiCo2O4 electrodes
| Autor: | A. Lakshmi Narayana, Obili M. Hussain, N. Varalakshmi, N.Y.Sreedhar |
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| Rok vydání: | 2021 |
| Předmět: |
Supercapacitor
Materials science Spinel chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Capacitance Nanocrystalline material 0104 chemical sciences Cobaltite Nickel chemistry.chemical_compound chemistry Chemical engineering X-ray photoelectron spectroscopy Specific surface area Electrochemistry engineering General Materials Science Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Solid State Electrochemistry. 25:1411-1420 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-021-04911-3 |
| Popis: | The nanostructured nickel cobaltite has been synthesized by a cost-effective facile hydrothermal method and demonstrated excellent electrochemical capacitive properties. The microstructural properties of as-synthesized nanostructured nickel cobaltite are probed with various analytical techniques, viz. XRD, XPS, BET, SEM, and TEM. A high-intensity (311) orientation along with other characteristic peaks observed in XRD spectrum corresponds to cubic spinel NiCo2O4 (NCO) phase with Fd $$ \overline{3} $$ m (227) symmetry. The NCO material is comprised of homogenous distribution of cuboid-shaped nanocrystalline particles as observed from TEM analysis. Brunauer-Emmett-Teller (BET) analysis evidenced that the prepared nickel cobaltite material possesses a high specific surface area 138 m2 g−1 with an average pore radius 4 nm. The high surface area and low average pore size generally offer more electroactive sites for Li-ion adsorption-desorption and avoid the stress upon the structure of the compound which resulted exemplary electrochemical performance. The NCO electrode delivered a superior specific capacitance of 2040 F g−1 at 1 A g−1 and retained 85.5% of its capacitance even after 5000 cycles. The desirable integrated quality such as long calendar life with high capacitance of the newly fabricated electrode enables it to be a promising material for high-performance supercapacitor devices. |
| Databáze: | OpenAIRE |
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