Structure and Electrochemical Performance of Hollow Tube Activated Carbon Prepared from Cotton as Electrode Material for Electric Double Layer Capacitor

doi:10.1007/s40242-016-5316-2

Abstract

Abstract:

Hollow tube-like activated carbon(HTAC) was fabricated by a simple and efficient carbonization method with cotton as carbon precursor activated by KOH without any template. The activation time from 0 to 90 min showed no significant effect on the micro-morphology, but greatly influenced the specific surface area and electrochemical performance. In the end, it was found that the sample activated for 60 min(HTAC-60) has a higher specific surface area of 2600 m²/g, a larger pore volume of 1.52 cm³/g and a greater specific capacitance of 483 F/g at a current density of 0.2 A/g in 1 mol/L H₂SO₄. Moreover, the sample HTAC-60 shows excellent cycle stability(only 12.2% loss after 5000 cycles) and a high energy density of 67.1 or 37.2 W·h·kg^-1 at a power density of 200 or 1000 W/kg, respectively, operated in a voltage range of 0-1.0 V in 1 mol/L H₂SO₄. The results indicate that cotton can potentially be used as a raw material for producing low cost and high performance activated carbon electrode materials for electric double layer capacitor.

Key words: Cotton, Hollow tube-like, Activated carbon, Electric double layer capacitor

LI Xinping, LI Jianling, YAN Gang, ZHU Zhixun, KANG Feiyu. Structure and Electrochemical Performance of Hollow Tube Activated Carbon Prepared from Cotton as Electrode Material for Electric Double Layer Capacitor[J]. Chemical Research in Chinese Universities, 2016, 32(1): 82-89.

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