Role of graphene on hierarchical flower-like NiAl layered double hydroxide-nickel foam-graphene as binder-free electrode for high-rate hybrid supercapacitor
| Autor: | Haiwon Lee, Luojiang Zhang, Rui Chen, Kwun Nam Hui, Xin Chen, Kwan San Hui |
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| Rok vydání: | 2016 |
| Předmět: |
Nial
Materials science Energy Engineering and Power Technology chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences law.invention chemistry.chemical_compound law computer.programming_language Supercapacitor Renewable Energy Sustainability and the Environment Graphene 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Nickel Fuel Technology Chemical engineering chemistry Electrode Hydroxide 0210 nano-technology computer Current density |
| Zdroj: | International Journal of Hydrogen Energy. 41:9443-9453 |
| ISSN: | 0360-3199 |
| Popis: | In this work, a facile two-step hydrothermal method was reported to grow hierarchical flower-like NiAl layered double hydroxide (LDH) directly on 3D nickel foam (NF) which was further coated with 2D graphene nanosheets (GNS) layers as binder-free supercapacitor electrode. The positive and negative effects of GNS on the electrochemical performance of LDH-NF electrode were investigated in detail. The prepared LDH-NF/GNS electrode maintained an enhanced specific capacity of 165.6 C g−1 after 4000 cycles at a high current density of 40 A g−1. Furthermore, a hybrid supercapacitor, with LDH-NF/GNS and GNS-NF as the positive and negative electrodes, achieved an energy density (31.5 Wh kg−1 at a power density of 400 W kg−1) and super long-term cycle stability (a specific capacity of 67.2 C g−1 at 5 A g−1 after 5000 cycles with 80% retention). This study not only opens up the possibility of engineering LDH-NF/GNS into a promising electrode, but also highlights the positive and negative roles of GNS on LDH-NF as binder-free electrodes for further development of high-performance supercapacitors. |
| Databáze: | OpenAIRE |
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