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.
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