Ni(OH) 2 nanosheets decorated with FeCoPi on NiO heterostructures: tunable intrinsic electronic structures for improved overall water splitting.

Herein, we demonstrate the rational design of 3-dimensional nickel double hydroxide nanosheets decorated with iron-cobalt phosphide on nickel oxide (Ni(OH) 2 @Fe x Co 1- x Pi|NiO) heterostructures for achieving improved overall water splitting. The as-optimized Ni(OH) 2 @Fe x Co 1- x Pi|NiO heterostructures exhibited an overpotential ( η ) of ∼133 mV and ∼173 mV at 10 mA cm -2 for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), respectively, in an alkaline electrolyte through a tunable electronic interaction and stabilization of the active Ni(OH) 2 and FeCoPi interface.