Journal
ENERGY STORAGE MATERIALS
Volume 26, Issue -, Pages 119-128Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2019.12.038
Keywords
Coal tar pitch; Free-radical; Carbon nanosheets; N/S dual-doping; Asymmetric supercapacitor
Funding
- National Natural Science Foundation of China [51672291, 51902326, U1510204, U1510120]
- Natural Science Foundation of Shanxi Province for Excellent Young Scholars, China [201601D021006]
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Doped quasi-two-dimensional carbons with layer-stacked porous architecture and chemically functionalized surface are strongly appealing for high-energy supercapacitors, but there are daunting challenges to synthesize them through a cost-efficient and eco-friendly path. Herein, N/S dual-doped stacked carbon nanosheets (D-SCN) is first synthesized from coal tar pitch, a cheap coking by-product, beginning with a controlled molecular radical-polymerization initiated by 2,3-dimethyl-2,3-diphenylbutane, followed by a one-step carbonization-activation process in presence of potassium benzoate and N,N'-diphenylthiourea. As-obtained D-SCN with reasonable densification shares a well-designed layer-stacked topology texture, hierarchical interconnected porous structure and N/S dual-doped surface, which work together to harvest high supercapacitive performance. The D-SCN delivers a maximal specific capacitance of 458 F g(-1), which is considerably higher than most of previously reported for other carbon materials. As-assembled asymmetric all-solid-state supercapacitor with a wide voltage range of 0-1.8 V takes on a volumetric energy density of 27 W h L-1 at a power density of 296 W L-1 with fading capacitance of merely 5.9% after 20000 cycles. The route advocated here for preparing pitch-based nanocarbons opens up new horizons in exploring large-scale preparation of electrode materials suitable for narrow spaces.
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