Alkaline water electrolysis is a cost-effective approach to hydrogen production, but it suffers from low operational current densities (typically ⤠500 mA cm-2) and thereby a low hydrogen production rate. Herein, we report the fabrication of self-supported porous cobalt phosphide (Co-P) foam by electrochemical anodization of commercially available cobalt foam, followed by thermal oxidation and subsequent phosp...