期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201705487
关键词
2D materials; high-pressure manufacturing; MXene; pressure; supercapacitors; volumetric energy density
类别
资金
- National Natural Science Foundation of China [61774122]
- Science and Technology Developing Project of Shaanxi Province [2015KW-001]
- 111 Project of China [B14040]
The volumetric performance of supercapacitors (SCs), besides the gravimetric performance, is attracting an increasing attention due to the fast development of electric vehicles and smart devices. Here, a unique design of symmetric supercapacitor material is reported with a tight face-to-face architecture by applying a high pressure to the delaminated Ti3C2 (d-Ti3C2) films. The high pressure makes the d-Ti3C2 films achieve an increased density, high electron conductivity, good wettability, and abundant interconnected mesopore channels to promote ion transport efficiently, that is, more cations can intercalate/deintercalate in the charging-discharging process. As a result, with the increase of the applying pressure, the d-Ti3C2 film pressured at 40 MPa in 1 M Li2SO4 exhibits an ultrahigh capacitance of over 633 F cm(-3), outstanding energy density, and cyclic stability. Especially, the corresponding SC in 1 M 1-ethyl-3-methylimidazolium tetrafluoroborate/acetonitrile organic electrolyte shows a high volumetric energy density of 41 Wh L-1, which is the highest value reported for the SCs based on MXene materials in organic electrolytes. The outstanding volumetric electrochemical performance and thermal stability of the SCs based on the ultracompact d-Ti3C2 film demonstrate their promising potential as forceful power sources for small electronic devices.
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