1. Fabrication of N, S co-doped graphene aerogel for high-performance supercapacitors: π-conjugated planar molecules as efficient dopants and pillared agents.
- Author
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Zhang, Lili, Chen, Huaxia, Lu, Xingyu, Wang, Yun, Tan, Lili, Sui, Dianpeng, and Qi, Wei
- Subjects
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SUPERCAPACITOR electrodes , *SUPERCAPACITOR performance , *GRAPHENE , *SUPERCAPACITORS , *CARBON foams , *GRAPHENE oxide , *DOPING agents (Chemistry) - Abstract
The paper presents a novel strategy for the fabrication of sandwich-like N, S co-doped graphene aerogels using π-π and H-bonding interactions between 2, 5-Dimercapto-1, 3, 4-thiadiazole (DMTD) and GO via hydrothermal method. The synergistic effect between N and S atoms plays key role to improve the supercapacitor performance of the fabricated graphene aerogel material. • π-conjugated DMTD molecules are used as dopant precursors and pillared agents for the fabrication of NSGA. • NSGA delivers a high gravimetric specific capacitance of 321 F g−1 at a current density of 1 A g−1. • The π-conjugated and H-bonding interactions improve the accessible surface area of NSGA. • The synergistic effect of N andS and enhancement of surface area are the main reason in promoting the SC performance. Rational constructing carbon electrode materials with heteroatoms (eg. N, S, B, F) and high surface area is essencial to the appealing performance of supercapacitor (SC). Here we present a novel fabrication strategy for sandwich-like N, S co-doped three-dimensional (3D) porous graphene aerogels (NSGAs) via one-pot hydrothermal method for high performance SCs materials. The unique advantage of the proposed synthesis strategy is the applications of 2, 5-Dimercapto-1, 3, 4-thiadiazole (DMTD) as bifunctional pillared agents and efficient dopant precursors. The planar DMTD molecules have shown strong supramolecular π-π and H-bonding interactions with graphene oxide (GO), thus avoiding the restacking of graphene sheets and enhancing the doping efficiency and amount of S atoms, which are beneficial to the SC performance of NSGA. The synthesized NSGA samples exhibit the atomic content of S up to 2.39 at.% with surface area at 366.0 m2 g−1, and display a maximum energy density of 10.52 W h kg−1 for assembled symmetric supercapacitor. The relatively high tandem device performance with a remarkable current response, even at 2000 mV s−1, reaches the top level for graphene-based SC system. The proposed simple fabrication strategy and attracting performance of NSGA material shed light on the potential practical applications of graphene-based material as SCs, and the observed structure-function relations also provides physical-chemical insight into the function principle of heteroatom doped graphene in SCs. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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