CoFe layered double hydroxide for enhanced electrochemical performance

Abstract

Layered double hydroxides (LDHs) are gaining serious attention as electrode materials for electrochemical energy storage device due to their enhanced redox reactions. It is essential to find a better candidate for energy storage device possessing high ion adsorption and faster surface redox reactions that can lead to improved charge transfer and controlled ionic and electronic transport. Herein, a network of curly-edged CoFe-layered double hydroxide (LDH) nanosheets was grown on Ni foam via a one-pot hydrothermal synthesis route. We studied the stepwise morphological evolution and electrochemical performance of CoFe-LDH during variable hydrothermal reaction conditions. After 5000 charge-discharge cycles, the CoFe-LDH exhibited a maximum areal capacity of 2263 mC cm−2 (at a scan rate of 5 mV s−1) and 1490 mC cm−2 (at an applied current of 0.1 A) with capacity retention of 92.6%. We also fabricated and tested the electrochemical properties of a symmetric cell device using CoFe-LDH, demonstrating that the CoFe-LDH is a promising candidate as an electrode material in energy storage applications.