Citation: Jingjing Yan, Ling Miao, Hui Duan, Dazhang Zhu, Yaokang Lv, Liangchun Li, Lihua Gan, Mingxian Liu. High-energy aqueous supercapacitors enabled by N/O codoped carbon nanosheets and "water-in-salt" electrolyte[J]. Chinese Chemical Letters, ;2022, 33(5): 2681-2686. doi: 10.1016/j.cclet.2021.08.123 shu

High-energy aqueous supercapacitors enabled by N/O codoped carbon nanosheets and "water-in-salt" electrolyte

Jingjing Yan ^b ,
Ling Miao ^{a, *,} ,
Hui Duan ^a ,
Dazhang Zhu ^a ,
Yaokang Lv ^d ,
Liangchun Li ^a ,
Lihua Gan ^a ,
Mingxian Liu ^{a, c, *,}

a.
Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
b.
School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China
c.
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China
d.
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

1310593@tongji.edu.cn

liumx@tongji.edu.cn

Received Date: 10 June 2021
Revised Date: 18 August 2021
Accepted Date: 30 August 2021
Available Online: 4 September 2021

Figures(4)

A facile fabrication strategy is reported to obtain N/O codoped porous carbon nanosheets for purpose of ameliorating the charge transfer and accumulation in the concentrated LiTFSI (lithium bis(trifluoromethane sulfonyl)imide) electrolyte. By tunning the feed ratio of comonomers, the porous nanosheet structure is endowed with a significant ion-adsorption surface area (1630 m²/g) and interconnected hierarchical porosity; meanwhile, high-level N/O dopants (N: 3.58 at%, O: 12.91 at%) increase the effective contact area for electrolyte ions, and further facilitate rapid ion/electron transfer. Benefiting from the advantageous features, carbon nanosheets electrode reveal an enhanced specific capacitance (375 F/g) in three-electrode configuration and the H₂SO₄-based device yields a high gravimetric energy density of 11.4 Wh/kg. Particularly, the ion-diffusion highways in porous carbon nanosheets contribute to the 2.25 V LiTFSI-based symmetric device with a high energy delivery up to 33.1 Wh/kg. This work offers an inspiring strategy for facile fabrication of carbon nanosheets, and demonstrates their promising application in "water-in-salt" electrolyte-based supercapacitor systems.
- Porous carbon nanosheets,
- N/O codoping,
- Water-in-salt electrolyte,
- High-energy supercapacitor
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