A durable quasi-solid-state zinc ion hybrid supercapacitor with coal tar pitch derived carbon material

Abstract

In this work, a porous carbon material (KCC) was prepared by using the coal tar pitch carbon source and energeticZn-basedmetal–organicframework template, which exhibits a high specific surface area (1527.0 m2/g), a high capacity of 133.9 mAh/g, excellent rate performance (50.4% retention at 20 A/g), and long-term cycle stability (103.3% capacity retention after 10,000 cycles). Additionally, a gelatin/polyacrylamide/κ-carrageenan/Zn(CF3SO3)2 hydrogel electrolyte (G/PAAm/κ-CG/Zn(CF3SO3)2) was also constructed. The quasi-solid-state Zn-ion hybrid supercapacitor based on KCC and G/PAAm/κ-CG/Zn(CF3SO3)2 delivers a specific capacity of 85.0 mAh/g at 0.25 A/g, 50.5% capacity retention at 20 A/g, high energy/power densities, and satisfactory cycle stability.