期刊
NANOSCALE
卷 8, 期 21, 页码 11136-11142出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr02155g
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资金
- National Key Basic Research Program 973 [2014CB239701]
- NSFC [51372116]
- Natural Science Foundation of Jiangsu Province [BK2011030, BK20151468]
- Fundamental Research Funds for the Central Universities of NUAA [NJ20160104]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Jiangsu Innovation Program for Graduate Education [CXZZ13_0158]
- Outstanding Doctoral Dissertation in NUAA [BCXJ13-13]
- Foundation of Graduate Innovation Center in NUAA [kfjj130219]
Two-dimensional (2D) carbon materials have attracted intense research interest for electrical double layer capacitors (EDLCs) due to their high aspect ratio and large surface area. Herein, we propose an exfoliation-chlorination route for preparing ultrathin carbon nanosheets by using ternary layered carbide Ti3AlC2 as the precursor. Due to the large intersheet space of exfoliated layered carbide (MXene), the as-prepared carbon nanosheets exhibit a thickness of 3-4 nm and a large specific surface area of 1766 m(2) g(-1) with hierarchical porosity. These features significantly improve the ion-accessible surface area for charge storage and shorten the ion transport length in the thin dimension. As a result, the carbon nanosheets show a high specific capacitance (220 F g(-1) at 0.5 A g(-1)), remarkable high power capability (79% capacitance retention at 20 A g(-1)) when measured in a symmetrical two-electrode configuration in an aqueous electrolyte. The method described in this work provides a new route to prepare 2D electrode materials from a bulk precursor, thus exploiting their full potential for EDLCs.
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