Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (08): 57-63.doi: 10. 13475/j.fzxb.20200809007

• Fiber Materials • Previous Articles     Next Articles

Preparation and electrochemical properties of cobalt-based hierarchical porous composite carbon materials

YE Chengwei1, WANG Yi1, XU Lan1,2()   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215123, China
    2. National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
  • Received:2020-08-24 Revised:2021-04-06 Online:2021-08-15 Published:2021-08-24
  • Contact: XU Lan E-mail:lanxu@suda.edu.cn

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Abstract:

In this research, carbon materials with high specific surface areas and hierarchical porous structures were prepared to improve the charge storage capacity of the electrode. Electrospinning technology was used to combine the cobalt metal organic framework materials (ZIF-67) with polyacrylonitrile (PAN)/polymethacrylate (PMMA) for fabricating the composite nanofiber membranes. Then the cobalt-based hierarchical porous composite carbon materials were obtained by high-temperature carbonization, and their characterization of structure and electrochemical performance were carried out. The effects of ZIF-67 loading amounts on the structure and performance of the electrode materials were explored. The results showed that the composite carbon materials loaded ZIF-67 had higher specific surface areas and richer mesoporous structures than a single carbon material. When the loading of ZIF-67 relative to PMMA was 10%, the specific surface area was 259.814 m2/g, the proportion of mesopores was 68.8%, and the specific capacitance could reach 151 F/g at a current density of 1 A/g, which was 3 times of the PAN/PMMA carbon material without ZIF-67. Moreover, its specific capacitance retention rate reached 84.8% after 2 000 cycles.

Key words: electrostatic spinning, metal organic framework, hierarchical porous material, electrode material, specific capacitance, supercapacitor

CLC Number: 

  • TS131.9

Fig.1

Microstructure of ZIF-67 and Co/CNFs-10 samples. (a)SEM image of ZIF-67; (b)TEM image of Co/CNFs-10"

Fig.2

Morphology of fibers with different ZIF-67 adhesion before and after carbonization"

Tab.1

Elemental relative content of Co/CNFs-X composite carbon materials%"

样品编号 C N O Co
Co/CNFs-0 82.307 11.305 6.388
Co/CNFs-10 75.908 6.696 9.521 7.878
Co/CNFs-20 68.003 4.325 6.796 20.876
Co/CNFs-30 65.450 0.838 4.756 28.956
Co/CNFs-40 63.570 0.526 3.643 32.261
Co/CNFs-50 60.774 0.345 2.429 36.452

Fig.3

XRD diagram of Co/CNFs-X composite carbon materials"

Fig.4

N2 adsorption-desorption isotherm of Co/CNFs-X composite cabron materials"

Fig.5

Pore size distribution of Co/CNFs-X composite carbon materials"

Tab.2

Pore structure test result of Co/CNFs-X composite carbon materials"

样品
编号		 比表面积/
(m2·g-1)		 孔容积/(cm3·g-1) 孔占比/%
总孔 微孔 中孔 微孔 中孔
Co/CNFs-0 185.889 0.284 0.119 0.146 41.90 51.40
Co/CNFs-10 259.814 0.183 0.043 0.126 23.49 68.80
Co/CNFs-20 233.830 0.162 0.062 0.091 38.27 56.17
Co/CNFs-30 120.782 0.192 0.042 0.139 21.87 72.39
Co/CNFs-40 75.757 0.158 0.041 0.108 25.95 68.35
Co/CNFs-50 400.270 0.258 0.069 0.176 26.74 68.22

Fig.6

CV curves of Co/CNFs-X electrode materials at 5 mV/s sweep"

Fig.7

GCD curves of Co/CNFs-X at 1 A/g current density"

Fig.8

Co/CNFs-X electrode materials specific capacitance under different current densities"

Fig.9

Recycling curve of Co/CNFs-10 electrode materials at 1.0 A/g current density"

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