Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

Abstract

Abstract Nanostructured multicomponent hydroxide has recently drawn wide attention as positive material for high‐performance supercapacitors. Herein, a multi‐dimensional Co(OH)F@NiCo‐LDH (LDH = layered double hydroxide) composite with layered nanocages has uniformly grown on nickel foam (NF) by a solvent‐assisted process, which involves the in situ growth of ZIF‐67 on the surface of Co(OH)F nanorods, followed by chemical etching of the hybrids. Benefiting from its subtle structural design, the Co(OH)F@NiCo‐LDH exhibits high specific capacitance of 4070 mC cm −2 at 1 mA cm −2 (1313.3 C g −1 at 1 A g −1 ), desirable rate performance (3104 mC cm −2 at 20 mA cm −2 ), and outstanding cycling stability (92.7% retention after 7000 cycles). Moreover, a two‐electrode system assembled by Co(OH)F@NiCo‐LDH and reduced graphene oxide exhibits a peak energy density of 49.34 Wh kg −1 at the corresponding power density of 865 W kg −1 . These results demonstrate that the Co(OH)F@NiCo‐LDH is an advanced positive material for the electrochemical device.