For large scale water electrolysis, low cost and stable electrocatalysts are essential. In this talk, I will present our recent work using earth abundant (Fe, Mo, Ni, etc. based) electrocatalysts for both hydrogen evolution and oxygen evolution reactions. The electrocatalysts are directly synthesized and anchored on commercially available metal foams, which serve as robust supports. The electrocatalysts are highly active and stable, especially under large current densities. For example, our bifunctional iron/dinickel phosphide on nickel foams drives efficiently both hydrogen and oxygen evolution reactions in alkaline electrolyte. The full cell can reach a current density of 10 mA cm-2 with 1.42 V in 1 M KOH. Moreover, it delivers 500 mA cm-2 at the lowest 1.72 V and maintains the performance for at least 40 h without decay. The excellent performance is attributed to large surface area, porous structures, high electrical conductivity, favorable electronic structure, and abundant active sites of the electrocatalysts. Our designs and materials are promising for large-scale water electrolysis.