Hydrogen has a high energy density and is good alternative for carbon-based fuels. Eectrochemical Water splitting provides a green method for hydrogen production. Though Pt, RuO₂, and IrO₂ are excellent electrocatalysts for HER and OER, their costly and scarce hinder their application for water splitting. This review focuses advance in transition metal hydroxides for electrochemical water splitting, catalysts, mechanisms, and approach for improving the water splitting-kinetics.