generated from various processes such as photocatalytic/electrolytic and thermal processes from different hydrogen-based sources such as water, biomass, boron hydrides, hydrogen sulfides, natural gas, and coal. [1] Among different strategies, water electrolysis is the simplest and most environmental friendly approach for the production of hydrogen of the highest purity. [2] Hydrogen evolution reaction (HER) is one of the half-cell reactions in overall water splitting which occurs at the cathode, whereas, oxygen evolution reaction (OER) is observed at the anode side. The OER is favorable in alkaline media, whereas the HER is favorable in acidic media. Irrespective of the medium, nanoscale engineering of catalyst to improve ohmic contact, mechanical robustness, and hydrophilicity to accelerate the H 2 or O 2 gas bubble separation and improve electrolyte contact are extremely important to facilitate the overall water splitting. [3] Several transition metals, in particular Ni, Co, and Fe based engineered materials in the form of oxides, hydroxides, layer double hydroxides, and metal organic framework, have been successfully demonstrated as efficient OER electrocatalyst in alkaline media. [4] HER involve the reduction of proton in acidic