Journal
CARBON
Volume 179, Issue -, Pages 458-468Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.04.062
Keywords
Carbon nanosheets; Supercapacitor; N-doping; Hierarchical pores; Volumetric performance
Funding
- National Natural Science Foundation of China [22002103]
- Anhui Provincial foundation for Leaders of Disciplines in Science [2020D250]
- Provincial of Natural Science Foundation of Anhui [2008085QB77]
- Primary Research and Development Program of Anhui Province [201904a05020087]
- Suzhou University Scientific Research Foundation Project [2019jb02]
- Innovative Research Team of Anhui Provincial Education Department [2016SCXPTTD]
- Key Discipline of Material Science and Engineering of Suzhou University [2017XJZDXK3]
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In this study, porous carbon nanosheets with high specific surface area and rich surface heteroatoms were successfully synthesized, leading to high gravimetric/volumetric capacitance and energy density of the supercapacitor. This work provides a new strategy for the mass production of high-performance carbon nanosheets for energy storage.
Porous carbon nanosheets with high specific surface area have become the most promising electrode materials for supercapacitor, but their high pore volume leads to relatively low density and poor volumetric capacitance. In this work, strutted nitrogen doped hierarchical porous carbon nanosheets (SNPCNS), featuring three-dimensional nonaggregated architecture braced by struts have successfully been scalably synthesized via a novel calcium D-gluconate-exploding technique. The pyrolysis temperature and duration, and the mass ratio of calcium D-gluconate and urea formaldehyde resin are regulated for optimizing the specific surface area, pore volume and capacitive performance of SNPCNS. The optimized SNPCNS displays high specific surface area (539 m(2) g(-1)), rich surface heteroatoms (8.1 at.% for N) and high density (1.11 g cm(-3)). Therefore, the supercapacitor assembled by SNPCNS electrodes presents very high gravimetric/volumetric capacitances of 286 F g(-1)/317 F cm-3 (in 6 M KOH) and 355 F g(-1)/ 394 F cm(-3) (in 1 M H2SO4). Importantly, high gravimetric/volumetric energy densities of 40.5 W h kg(-1)/ 44.9 W h L-1 (in ionic liquid) are achieved, which are superior to those of previously reported carbon nanosheets based symmetric supercapacitors. This work provides a new strategy for the mass and lowcost production of high-performance porous carbon nanosheets for energy storage. (C) 2021 Elsevier Ltd. All rights reserved.
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