A binder-free cobalt phosphate hydrate (Co(PO)·8HO) multilayer nano/microflake structure is synthesized on nickel foam (NF) via a facile hydrothermal process. Four different concentrations (2.5, 5, 10, and 20 mM) of Co and PO were used to obtain different mass loading of cobalt phosphate on the nickel foam. The Co(PO)·8HO modified NF electrode (2.5 mM) shows a maximum specific capacity of 868.3 C g (capacitance of 1578.7 F g) at a current density of 5 mA cm and remains as high as 566.3 C g (1029.5 F g) at 50 mA cm in 1 M NaOH. A supercapattery assembled using Co(PO)·8HO/NF as the positive electrode and activated carbon/NF as the negative electrode delivers a gravimetric capacitance of 111.2 F g (volumetric capacitance of 4.44 F cm). Furthermore, the device offers a high specific energy of 29.29 Wh kg (energy density of 1.17 mWh cm) and a specific power of 4687 W kg (power density of 187.5 mW cm).
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