One‐Step Synthesis of Porous Ni−Co−Fe−S Nanosheet Arrays as an Efficient Battery‐Type Electrode Material for Hybrid Supercapacitors

Abstract Construction of porous nanosheet arrays of transition‐metal sulfides (TMSs) holds great potential for energy storage. Herein, a one‐step hydrothermal process is employed for the construction of porous Ni 1.43 Fe .5 Co .5 S .97 nanosheet arrays (NFCS‐NS) on the nickel foam as a proper positive electrode for hybrid supercapacitor. Owing to the appealing structural features, the NFCS‐NS depicts a high capacity of 1156 C g −1 at 2 A g −1 , desirable rate capability of 81.1 %, and significant cyclability of 92.9 %. Also, a promising hybrid device (NFCS‐NS//AC) based on NFCS‐NS and activated carbon (AC) represents a reasonable energy density of 57.3 Wh kg −1 at 807.04 W kg −1 and a notable power density of 20000 W kg −1 at 40 Wh kg −1 . Therefore, our current research can introduce an effective strategy for the fabrication of high‐performance electrodes with porous architectures.