Advanced Functional Materials· 2012Q1
Advanced Asymmetric Supercapacitors Based on Ni(OH)<sub>2</sub>/Graphene and Porous Graphene Electrodes with High Energy Density
- 1,994citations
- Q1SCImago
- 2012year
Short summary
A novel asymmetric supercapacitor using Ni(OH)2/graphene and porous graphene electrodes achieves a high energy density of 77.8 Wh kg−1 and retains 94.3% capacitance after 3000 cycles.
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Key points
- Asymmetric supercapacitor fabricated using Ni(OH)2/graphene and porous graphene electrodes.
- Operates in a high-voltage region of 0–1.6 V.
- Achieves a maximum specific capacitance of 218.4 F g−1.
- Delivers a high energy density of 77.8 Wh kg−1.
- Exhibits excellent cycle life, retaining 94.3% specific capacitance after 3000 cycles.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Hierarchical flowerlike nickel hydroxide decorated on graphene sheets has been prepared by a facile and cost‐effective microwave‐assisted method. In order to achieve high energy and power densities, a high‐voltage asymmetric supercapacitor is successfully fabricated using Ni(OH) 2 /graphene and porous graphene as the positive and negative electrodes, respectively. Because of their unique structure, both of these materials exhibit excellent electrochemical performances. The optimized asymmetric supercapacitor could be cycled reversibly in the high‐voltage region of 0–1.6 V and displays intriguing performances with a maximum specific capacitance of 218.4 F g −1 and high energy density of 77.8 Wh kg −1 . Furthermore, the Ni(OH) 2 /graphene//porous graphene supercapacitor device exhibits an excellent long cycle life along with 94.3% specific capacitance retained after 3000 cycles. These fascinating performances can be attributed to the high capacitance and the positive synergistic effects of the two electrodes. The impressive results presented here may pave the way for promising applications in high energy density storage systems.
The authors' abstract, as published at the source. Advanced Functional Materials, 2012 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science