Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 43, Pages 16879-16885Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta06566j
Keywords
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Funding
- National Basic Research Program of China (973 Program) [2014CB239701]
- National Natural Science Foundation of China [51372116, 51672128]
- Natural Science Foundation of Jiangsu Province [BK20151468, BK2011030]
- Fundamental Research Funds for the Central Universities of NUAA [NJ20160104]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Two-dimensional (2D) carbon nanosheets have emerged as an attractive candidate for electrical double layer capacitors (EDLCs) due to their large specific surface area, good electrical conductivity and high charge mobility. However, the easy aggregation nature of nanosheets hinders rapid transport of electrolyte ions, reducing the ion-accessible area and restricting the ion transportation. Herein, we propose a template strategy for preparing three-dimensional (3D) porous carbon nanosheets (PCNs) with an oriented and interconnected nanostructure. Zinc layered hydroxide nitrate is used as a layered template and provides a nanospace to confine the carbonization process of the organic carbon precursor (gallic acid). The unique nanostructure and large surface area of chemically activated PCNs (aPCNs) significantly shorten the ion transport length in low dimensions and improve the electrolyte wettability and ion accessible surface area for charge storage. The aPCNs exhibit excellent performance as demonstrated by their large specific capacitance (327 F g(-1) at a current density of 0.5 A g(-1)), superior rate capability (retaining 60.2% at 20 A g(-1)) and stable cyclability. In particular, the assembled symmetric device based on aPCNs delivers an energy density as high as 10.2Wh kg(-1) at a power density of 301 W kg(-1).
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