Oxygen vacancy-rich amorphous porous NiFe(OH)x derived from Ni(OH)x/Prussian blue as highly efficient oxygen evolution electrocatalysts

Oxygen vacancy-rich amorphous porous NiFe(OH)x on carbon paper is prepared through a two-step electrochemical depostion of Prussian blue nanocrystal layer and Ni(OH)x layer followed by an alkaline etching process for efficient OER catalysis.