Journal
ACS MATERIALS LETTERS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.2c00616
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Funding
- Science and Technology Major Project of Shanxi [202101030201022]
- Fundamental Research Program of Shanxi Province [202103021223019]
- National Natural Science Foundation of China [22120102004, 21720102006]
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A novel structured graphene, named flash nitrogen-doped graphene (FNG), has been synthesized using a solvent-and catalyst-free flash Joule heating method. FNG features high graphitization with a turbostratic structure and exhibits high surface-area-normalized capacitance and exceptional rate capability. It also demonstrates desirable cyclic stability, making it a promising candidate for high-performance supercapacitors.
Novel structured graphene produced by an environmentally-friendly and high-yielding method together with excellent electrochemical energy storage performance is pursued. A one-pot, solvent-and catalyst-free flash Joule heating approach is developed for synthesizing nitrogen-doped graphene and so named as flash nitrogen-doped graphene (FNG). The precursors of amorphous carbon black and urea are quickly converted into high-quality FNG in less than 1 s under a short electrical pulse with a bright flash of blackbody radiation. The prepared FNG product features high graphitization with a turbostratic structure. It delivers a high surface-area-normalized capacitance of 152.8 mu F cm(-2) at 1 A g(-1), an extraordinary rate capability with prominent capacitance retention of 86.1% even at 128 A g(-1), and a knockdown relaxation time of 30.2 ms. Besides, the assembled symmetric quasi-solid-state supercapacitor exhibits a high energy density of 16.9 Wh kg(-1) and a maximum power density of 16.0 kW kg(-1), as well as desirable cyclic stability (91.2% of initial capacitance is maintained after 10000 cycles). These outstanding performances show that FNG is a promising candidate for exploiting high-performance supercapacitors.
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