Journal
ADVANCED MATERIALS
Volume 31, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201806197
Keywords
carbon dots; hierarchical porous carbons; hybrid supercapacitors; hydrogels; surface states
Categories
Funding
- National Natural Science Foundation of China [21771039, 21622303]
- Shanghai Science and Technology Committee [16DZ2270100]
- National Key Research and Development Plan [2016YFA0203302]
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Hybrid supercapacitors generally show high power and long life spans but inferior energy densities, which are mainly caused by carbon negative electrodes with low specific capacitances. To improve the energy densities, the traditional methods include optimizing pore structures and modifying pseudocapacitive groups on the carbon materials. Here, another promising way is suggested, which has no adverse effects to the carbon materials, that is, constructing electron-rich regions on the electrode surfaces for absorbing cations as much as possible. For this aim, a series of hierarchical porous carbon materials are produced by calcinating carbon dots-hydrogel composites, which have controllable surface states including electron-rich regions. The optimal sample is employed as the negative electrode to fabricate hybrid supercapacitors, which show remarkable specific energy densities (up to 62.8-90.1 Wh kg(-1)) in different systems.
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