Journal
ELECTROCHIMICA ACTA
Volume 354, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136703
Keywords
Nitroaromatic molecule; N-doped graphene; 5-nitroindole; Pseudo-capacitance; Supercapacitor
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Funding
- National Natural Science Foundation of China [51862011, 51662012]
- Natural Science Foundation of Jiangxi Province [20171BAB206013]
- Academic and Technical Leader Plan of Jiangxi Provincial Main Disciplines [20182BCB22014]
- Jiangxi Science and Technology Normal University [2016QN-BJRC001]
- Jiangxi Science & Technology Normal University Program for Scientific Research Innovation Team [YC2019-X29]
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Nitroaromatic pollutants with unusually strong adsorption affinity are highly attractive candidates for creating 2D molecular assemblies on the surface of graphene, which is crucial to prepare high-quality N-doped graphene by post-treatment. Herein, the few-layered crumpled N-doped graphene (5-NIGN) with high N content is successfully prepared by mixing 5-nitroindole (5-NI), ammonia, and graphene oxide (GO) and using a simple hydrothermal method followed by the post-treatment process of vacuum freeze-drying and annealing. It is found that the rapid assembly of 5-NI effectively suppresses the aggregation of the products in the reduction process of GO, so that the thickness of as-prepared 5-NIGN is 4.21 nm, very close to that of GO (4.01 nm). Compared with the N-doped graphene (GN) derived from the system of GO containing ammonia (341 F g(-1)), 5-NIGN exhibits higher capacitance of 457.4 F g(-1) at 1 A g(-1) and prominent long-term life (115% of capacitance maintenance upon 10,000 cycles) within the voltage window of 1.0 V. Furthermore, the supercapacitor assembled by 5-NIGN electrodes can deliver the energy density of 15.5 Wh kg(-1) 18.5 Wh kg(-1) at the power density of 8000 W kg(-1) 800 W kg(-1). These results indicate that the 5-NIGN material will have potential advantages in the realm of electrochemical energy storage. (C) 2020 Elsevier Ltd. All rights reserved.
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