Effect of different pretreatment methods on sesame husk-based activated carbon for supercapacitors with aqueous and organic electrolytes
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Sesame husks have been explored as a novel precursor to prepare high-performance activated carbons through two pretreatment processes coupled with KOH activation. The optimal structure of as-prepared carbon, which consisted of numerous micropores, well-defined mesopores, high specific surface of 2772 m2/g and large total pore volume of 1.206 cm3/g, is obtained via pre-carbonization and KOH activation. When applied in supercapacitors, the as-prepared carbon-based electrode achieves high specific capacitance of 301 F/g and 155 F/g in 6 M KOH aqueous electrolyte and 1 M Et4NBF4/PC organic electrolyte, respectively. Moreover, it also shows superior cycling stability of 94.9% and 92.5% capacitance retention after 10,000 cycles in KOH and Et4NBF4/PC electrolyte. Hence, this work makes the sesame husks act as a novel carbonaceous precursor and makes the pre-carbonization combined with KOH activation as an effective method for electrode materials in supercapacitor applications.
This work is financially supported by the National Natural Science Foundation of China (Grant Nos. 51404098, U1361119), International Science and Technology Cooperation Program of Henan (Grant No. 152102410047), Key Program of Science and Technology of the Education Department of Henan Province (Grant No. 14A440014), Natural Science Foundation of Henan (162300410115), Program for Innovative Research Team (in Science and Technology) in the University of Henan Province (Grant No. 16IRTSTHN005).
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The authors declare that they have no conflict of interest.
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