Effect of pore size of carbon materials on the performance of hybrid supercapacitors in aqueous redox electrolyte
DOI:
https://doi.org/10.18321/cpc22(3)205-211Keywords:
porous structure, hybrid capacitor, iodides, double electric layer, energy storage devicesAbstract
This paper investigates the effect of the porous structure of carbon materials on the performance of hybrid supercapacitors using an aqueous redox electrolyte of 5M NaNO3+0.5M NaI. For this purpose, three different carbon materials including activated carbon from rice husk, carbon from magnesium citrate and carbon obtained using templat silica were synthesized. Optimization of the porous structure of the positive electrode achieved a specific capacitance of 403 F/g and a specific energy of 30 W h/kg at a current density of 0.5 A/g for the positive electrode cell with an average pore size of 3.4 nm. Experimental results showed that the pore size and surface area significantly affect the iodide retention capacity, which in turn determines the capacitance and specific energy of the hybrid supercapacitor. The use of activated carbon with pores less than 1 nm allowed achieving a high energy efficiency of 79%.
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