Design and construction of hollow metal sulfide/selenide core–shell heterostructure arrays for hybrid supercapacitor

NiSe 2 @Co 9 S 8 and Co 0.85 Se@Co 9 S 8 hollow core–shell heterostructures were prepared by electrodeposition and demonstrated outstanding areal capacitance values of 12.54 F cm −2 and 9.61 F cm −2 at 2 mA cm −2 , respectively.