Efficient binder-free electrode with a derivative synthesis of a four-leaf clover cobalt oxide from a metal organic framework on nickel foam as an energy storage device

A new oxidized zeolitic imidazolate framework-67 with the four-leaf clover morphology is synthesized on Ni foam without binder as the active material for energy storage. At 500 W kg −1 , the device shows a maximum energy density of 23.1 W h kg −1 .