石墨烯改性椰壳活性炭复合材料的制备及其电化学性能研究

doi:10.3969/j.issn.0253-2417.2020.01.009

Abstract

Abstract:

Steam activated carbon (AC) was prepared by using coconut shell as raw material, followed by using hydrothermal method and ethanol and water as solvent to prepare capacitance super-capacitor (GAC1-GAC5) with the mass ratios of AC and graphene(GR) 90:0, 90:5, 90:54, 90:90 and 54:90. By nitrogen adsorption-desorption, XRD and SEM methods, the pore structure and surface morphology of activated carbon were characterized. Comparison of different composite capacitance ratio super-capacitor electrode material was analyzed by cyclic voltammetry(CV), galvanostatic charge-discharge(GCD) method. The experimental results showed that the specific surface area of coconut shell activated carbon was 2 482 m²/g, and its pore diameter was mainly distributed at 2-4 nm, with the pore volume as 1.33 cm³/g, specific capacitance was 85 F/g in 6 mol/L KOH electrolyte. Under the conditions of carbonization temperature of 800℃, activation temperature of 900℃ and activation time of 1.5 h, the addition of the graphite improved the composite material capacitance up to 186 F/g.

Key words: activated carbon, graphene, supercapacitor, specific capacitance

CLC Number:

TQ35
TQ150

Yuxuan LIU,Dipan XUAN,Jiajia LI,Shuirong LI,Haiyong TANG,Zhifeng ZHENG. Preparation of Graphene Modified Coconut Shell Activated Carbon Composite and Its Electrochemical Performance[J]. Chemistry and Industry of Forest Products, 2020, 40(1): 61-67.

Figures/Tables 9

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样品 sample	比表面积/(m ²·g ^-1) S_BET	孔容/(cm ³·g ^-1) pore volume	平均孔径/nm average pore size
AC	2482	1.33	2.66
石墨烯graphene	253	0.58	5.94
GAC-3	1774	1.17	3.07

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Preparation of Graphene Modified Coconut Shell Activated Carbon Composite and Its Electrochemical Performance

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