Citation: Xiao Wang, Kaixiang Zou, Weijing Wu, Yuanfu Deng, Guohua Chen. N, O co-doped porous carbon with rich pseudocapacitive groups exhibiting superior energy density in an acidic 2.4 V Li₂SO₄ electrolyte[J]. Chinese Chemical Letters, ;2022, 33(8): 3883-3888. doi: 10.1016/j.cclet.2021.11.057 shu

N, O co-doped porous carbon with rich pseudocapacitive groups exhibiting superior energy density in an acidic 2.4 V Li₂SO₄ electrolyte

Xiao Wang ^a ,
Kaixiang Zou ^a ,
Weijing Wu ^a ,
Yuanfu Deng ^{a, b, *,} ,
Guohua Chen ^c

a.
The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
b.
Electrochemical Energy Engineering Research Center of Guangdong Province, South China University of Technology, Guangzhou 510640, China
c.
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China

chyfdeng@scut.edu.cn

Received Date: 23 September 2021
Revised Date: 11 November 2021
Accepted Date: 16 November 2021
Available Online: 24 November 2021

Figures(6)

Designing a carbon material with a unique composition and surface functional groups for offering high specific capacity in a wide voltage window is of great significance to improve the energy density for the supercapacitor in a cheap and eco-friendly aqueous electrolyte. Herein, we develop an efficient strategy to synthesize a N, O co-doped hierarchically porous carbon (NODPC-1.0) with moderate specific surface area and pore volume as well as rich heteroatoms using a deep eutectic solvent (DES) as an activator. It is found that NODPC-1.0 with a large proportion of pseudocapacitive functional groups (pyrrole-N, pyridine-N and carbonyl-quinone) can work stable in an acidic 2 mol/L Li₂SO₄ (pH 2.5) electrolyte, exhibiting specific capacities of 375 and 186 F/g at the current densities of 1.0 and 100 A/g, respectively. Also, the assembled symmetric capacitor using the NODPC-1.0 as the active material and 2 mol/L acidic Li₂SO₄ (pH 2.5) as the electrolyte shows an outstanding energy density of 74.4 Wh/kg at a high power density of 1.44 kW/kg under a broad voltage window (2.4 V). Relevant comparative experiments indicate that H⁺ of the acidic aqueous electrolyte plays a crucial part in enhancement the specific capacity, and the abundant pseudocapacitive functional groups on the surface of the NODPC-1.0 sample play the key role in the improvement of electrochemical cycle stability under a broad voltage window.
- Hierarchically porous carbon,
- Acidic Li₂SO₄ electrolyte,
- N, O co-doped carbon,
- Supercapacitor,
- High work voltage
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

N, O co-doped porous carbon with rich pseudocapacitive groups exhibiting superior energy density in an acidic 2.4 V Li2SO4 electrolyte

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通讯作者: 陈斌, bchen63@163.com

N, O co-doped porous carbon with rich pseudocapacitive groups exhibiting superior energy density in an acidic 2.4 V Li₂SO₄ electrolyte