Mn3O4 nano-octahedrons on Ni foam as an efficient three-dimensional oxygen evolution electrocatalyst

Large-scale electrolysis of water for hydrogen production requires efficient and earth-abundant oxygen evolution catalysts. Here, we demonstrate a facile method to prepare catalytically active Mn3O4 octahedral crystals on Ni foam as a composite electrode, which exhibits outstanding activity and stability for electrocatalytic oxygen evolution.