Mangosteen husk-derived porous carbon for quasi solid-state supercapacitor with advanced performances

Abstract

Exploiting advanced electrode materials and electrolytes are two fundamental approaches to enhance the electrochemical performances of supercapacitor. Herein, mangosteen husk-derived porous carbon (MHPC) and KOH gel-electrolyte are prepared and applied in quasi solid-state supercapacitor. In coin-type supercapacitor employing 6 M KOH gel-electrolyte, the MHPC electrode exhibits a high specific capacitance of 285 F g−1 at a current density of 0.2 A g−1, coupled with exceptional cyclability, retaining 88.9 % of its initial capacity after 10,000 cycles. Additionally, the elaborated MHPC electrode and 6 M KOH gel-electrolyte enabled the flexible device in maintaining superior capacitive properties under arbitrary bending angles. Our findings present an avenue in the development of cost-effective and highly safe energy storage devices.