Ni₃S₂/Zn_0.76Co_0.24S for high performance hybrid supercapacitor

¹ School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China.;
² School of Integrate Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China.

^* Corresponding author: zhijieli@uestc.edu.cn

Abstract

Supercapacitors have become a research hotspot in the field of energy storage due to their highpower density, fast charging/discharging ability, long-term stability and safety. Nevertheless, relatively low energy density hindered their application. Herein, Ni₃S₂/Zn_0.76Co_0.24S (NZCS) microsphere were synthesized using a facile two-step hydrothermal process. The polymetallic synergies can improve conductivity and shorten ion transport path. The uniform particle distribution provided numerous active sites for faradaic reactions. The NZCS mircosphere showed a large capacity of 571.5 C g^-1 at 1 A g^-1 and 87% rate rentention when the current increases by 10 times. A hybrid supercapacitor assmebled by NZCS cathode and active carbon anode demostrate a high energy density of 44.1 Wh kg^-1 (407.0 W kg^-1) and a stable cycliability of 15,000 cycles with 15% loss. Thus, NZCS is a promising electrode material for high performance supercapacitor.