首页|Activated microporous carbon spheres for electric double-layer capacitor
Activated microporous carbon spheres for electric double-layer capacitor
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NSTL
Supercapacitors(SC)are essential energy storage devices for renewable energies.In this study,activated microporous carbon spheres(AMCS)and nitrogen-doped AMCS(N-AMCS)were synthesized using a modified extended Stober method followed by CO2 activation.A high specific area(> 3400 m~2 g~(-1))was obtained for AMCS and N-AMCS,and the diameters of the sphere could be tuned from 400 nm to 1.0 μm.The SC study revealed that the AMCS and N-AMCS achieved specific capacitances of 232.75 and 263.59 F g~(-1),respectively,in 6 M potassium hydroxide(KOH).The SC pouch cells were filled with aqueous,organic,and ionic liquid electrolytes.In 1 M MeEt3NBF4 in acetonitrile,the energy densities of AMCS and N-AMCS were 27.96 and 31.20 Wh kg~(-1),respectively,at the current density of _(0.5)A g~(-1),whereas the energy densities of AMCS and N-AMCS were 69.19 and 117.69 Wh kg~(-1),respectively,in EMIMBF4.In addition,in the aqueous electrolytes,AMCS and N-AMCS had capacitance retentions of 94% and 97%,respectively,after 10,000 cycles,while the capacitance retentions of 82% and 97% were achieved with AMCS and N-AMCS,respectively,after 50,000 cycles.
NSTL
