H<sub>3</sub>PO<sub>4</sub> activated carbons as the electrode materials of supercapacitors using an ionic liquid electrolyte

ZHANG Qiu-hong; ZUO Song-lin; WEI Xin-yu; WANG Yong-fang

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Article Navigation > New Carbon Mater. > 2018 > 33(1): 61-70

ZHANG Qiu-hong, ZUO Song-lin, WEI Xin-yu, WANG Yong-fang. H3PO4 activated carbons as the electrode materials of supercapacitors using an ionic liquid electrolyte. New Carbon Mater., 2018, 33(1): 61-70.

Citation:

ZHANG Qiu-hong, ZUO Song-lin, WEI Xin-yu, WANG Yong-fang. H₃PO₄ activated carbons as the electrode materials of supercapacitors using an ionic liquid electrolyte. New Carbon Mater., 2018, 33(1): 61-70.

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H₃PO₄ activated carbons as the electrode materials of supercapacitors using an ionic liquid electrolyte

Jiangsu Key Laboratory of Biomass-based Green Fuels and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China

Funds: Special Fund for Forest Scientific Research in the Public Welfare(201404611);Doctoral Supervisor Foundation from Ministry of Education Doctor Station(20133204110007).

Received Date: 2017-06-25
Accepted Date: 2018-02-11
Rev Recd Date: 2017-10-15
Publish Date: 2018-02-28

Abstract

Abstract

H₃PO₄-activated carbons were prepared from Chinese fir sawdust, and their pore structure, surface chemistry and morphology were characterized by nitrogen adsorption, SEM and XPS. Their electrochemical performance as electrode materials for supercapacitors using[BMIM] [PF6] as the electrolyte was investigated by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. Results indicate that H₃PO₄ activation at 800 to 950℃ produces highly developed mesopores with a volume percentage as high as 66% of the total porosity. The carbon prepared at a H₃PO₄ to sawdust mass ratio of 3:1 has a specific capacitance of 162 F/g and delivers an energy density of 22.5 Wh/kg at 0.5 A/g. The specific capacitance remains at 86% after 5 000 cycles at 5 A/g, suggesting good cycling stability and rate capability. H₃PO₄ activation is an effective method to prepare activated carbons for use in ionic liquid-based supercapacitors.
- H₃PO₄ activation,
- Activated carbon,
- Ionic liquid,
- Supercapacitor

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References(33)

References

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