Abstract
Unique structured electrodes with abundant surface area is imperative for developing high-performance supercapacitors. Herein, hollow hierarchical Ni3S2 @Co9S8 (NiS@CoS) nanotubes are rationally designed by a one-pot strategy, which demonstrate a substantial high active area. Accordingly, NiS@CoS nanotubes have exhibited promising electrochemical energy storage characteristics with high areal specific capacitance (9.79 F cm?2 at 2 mA cm?2) and excellent cycling stability (80.8% retention after 10000 at 20 mA cm?2). Furthermore, the hybrid supercapacitor (HSC) is designed with the NiS@CoS and active carbon (AC) as positive and negative electrodes, respectively. Remarkably, the HSC achieves ultrahigh energy density of 0.63 mWh cm?2 at a power density of 1.66 mW cm?2 (and 0.37 mWh cm?2 at 21.76 mW cm?2). This work offers a simple and effective approach to fabricate low-cost transition metal sulfides with great prospects in practical energy storage applications.
NSTL
Elsevier