Construction of NiCo2O4 nanorods into 3D porous ultrathin carbon networks for high-performance asymmetric supercapacitors
| Autor: | Kangze Dong, Yanguo Liu, Dan Wang, Sun Meizhu, Shaohua Luo, Zhiyuan Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Materials science Mechanical Engineering Metals and Alloys Nucleation chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance 0104 chemical sciences chemistry Mechanics of Materials Electrode Materials Chemistry Nanorod 0210 nano-technology Science technology and society Carbon Power density |
| Zdroj: | Journal of Alloys and Compounds. 783:1-9 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.12.278 |
| Popis: | Rational design of electrode architecture and utilization of distinct components are effective strategies to further enhance the performance of supercapacitors. In this work, a novel hybrid heterostructure consisting of NiCo2O4 nanorods with diameter between 10 nm and 20 nm grown on three-dimensional porous carbon (3D-OPC) is successfully fabricated via a simple direct nucleation on 3D-OPC matrix under hydrothermal conditions. The merits of highly conductive porous carbon and short ion transport channels in NiCo2O4 nanorods together with the synergistic effect between NiCo2O4 and 3D-OPC result in a higher specific capacitance of 1297 F g−1 at 0.5 A g−1 and enhanced rate capability (1253.6 Fg−1 at 5 A g−1) compared with urchin-like NiCo2O4. Moreover, an asymmetric supercapacitor device using hybrid NiCo2O4/3D-OPC and porous carbon as electrodes delivers a high energy density of 29.23 Wh kg−1 at 1.55 kW kg−1, outstanding power density (7.75 kW kg−1 at 27.38 Wh kg−1), and good cycling stability (capacitance retention of 87.6% after 3000 cycles at 1 A g−1), making it as one of the most promising candidates for electrochemical energy storage. |
| Databáze: | OpenAIRE |
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