In situ formation of Mn4+ over oxygen vacancy rich spongy manganese–cobalt oxide through sodium and NiP incorporation for the electrocatalytic oxygen evolution reaction

A spongy MnCo 2 O 4 catalyst system with suppressed Jahn–Teller distortion developed through the incorporation of sodium into MnCo 2 O 4 and its deposition with an NiP coating for electrocatalytic OER.