Controlled synthesis of Ni(OH) 2 /Ni 3 S 2 hybrid nanosheet arrays as highly active and stable electrocatalysts for water splitting

Using Ni(OH) 2 /Ni 3 S 2 -12h as a bifunctional water splitting catalyst, with an overpotential of ∼340 mV, which is obtained at a very low cell voltage of 1.57 V with a current density of 10 mA cm −2 in 1.0 M KOH.