期刊
CHEMICAL ENGINEERING JOURNAL
卷 383, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123153
关键词
Nitrogen-doped; Carbon aerogel; Polyaniline hydrogel; Interlayer expansion; Pseudocapacitor
资金
- National Natural Science Foundation of China [51872161]
- Natural Science Foundation of Shandong Provincial [ZR2017ZB0316]
- Experimental Equipment Center of Qufu Normal University
The energy density of aqueous-electrolyte supercapacitors based on nanostructured carbon materials is usually limited by relatively narrow operating voltage window (about 1 V in acid aqueous electrolyte), due to the existence of overpotential. We report a novel N/S-codoped carbon aerogel (NS-CAG) derived from a methyl blue-doped polyaniline hydrogel (MB-PHG) with 3D interconnected supramolecular architecture through polymerization and carbonization. The obtained NS-CAG shows a high active nitrogen content along with simultaneous interlayer expansion, probably attributed to the MB-enabled supramolecular architecture of MB-PHG precursor, in favor of improving its pseudocapacitance and electrolyte ion diffusion. The assembled asymmetric pseudocapacitors based on the graphite fiber-supported NS-CAG and MB-PHG electrodes, can break through the overpotential barrier to an ultrahigh operating voltage window of 2.0 V in 1 M H2SO4, resulting in the excellent energy density of 59.7 Wh kg(-1) at 1 kW kg(-1). This high-energy asymmetric pseudocapacitor can open up an exciting route to extend the operating voltage window for aqueous-electrolyte energy storage.
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