LAUSR

Abstract To produce three-dimensional (3D) low-inner-resistance electrode, nickel sulfide sheet-like nanoarray (NiS) with secondary nanoflakes vertically grown on primary nanosheets is fabricated via sulfurization of hierarchical structured Ni(OH)2 supported on carbon cloth substrate. Due to profuse exposed-edge planes, the obtained electrode exhibits remarkable hybrid properties with a highly specific capacity of 361 μA h cm−2 at 2 mA cm−2 in 3 M KOH medium, and excellent cycling stability (85 % capacitance retention after 5000 cycles). Further, the fabricated flexible and lightweight electrode is used to evaluate its performance in a solid-state flexible hybrid battery. The assembled flexible hybrid battery exhibits a high energy density of 10.97 Wh kg−1 with a power density of 54.86 W kg−1 at an operating voltage of 1.6 V. Thus, the designed NiS nanosheet arrays are considered as remarkable electrode material for energy storage applications.