Ternary NiCeCo-Layered Double Hydroxides Grown on CuBr2@ZIF-67 Nanowire Arrays for High-Performance Supercapacitors

Ternary layered double-hydroxide-based active compounds are regarded as ideal electrode materials for supercapacitors because of their unique structural characteristics and excellent electrochemical properties. Herein, an NiCeCo-layered double hydroxide with a core-shell structure grown on copper bromide nanowire arrays (CuBr2@NCC-LDH/CF) has been synthesized through a hydrothermal strategy and calcination process and utilized to fabricate a binder-free electrode. Due to the unique top-tangled structure and the complex assembly of different active components, the prepared hierarchical CuBr2@NCC-LDH/CF binder-free electrode exhibits an outstanding electrochemical performance, including a remarkable areal capacitance of 5460 mF cm(-1) at 2 mA cm(-2) and a capacitance retention of 88% at 50 mA cm(-2) as well as a low internal resistance of 0.163 Omega. Moreover, an all-solid-state asymmetric supercapacitor (ASC) installed with CuBr2@NCC-LDH/CF and activated carbon electrodes shows a high energy density of 118 Wh kg(-1) at a power density of 1013 W kg(-1). Three assembled ASCs connected in series can operate a multifunctional display for over three and a half hours. Therefore, this innovative work provides new inspiration for the preparation of electrode materials for supercapacitors.

Automated summary

In this study, a NiCeCo-layered double hydroxide-chlorine-bridged compound was successfully synthesized and demonstrated excellent electrochemical performance in a binder-free electrode. The unique structure and complex assembly of the electrode resulted in remarkable capacitance and low internal resistance, allowing for high energy density in an all-solid-state supercapacitor when assembled with activated carbon electrodes. The supercapacitor enabled continuous operation of a multifunctional display for over three and a half hours.