Environmental sustainability requires a series of new functional materials for efficient catalysis, energy storage, conversion of solar energy into electricity, smart glass technology, carbon capture, and isolation, to name only a few. Renewable-based energy solutions (i.e., solar, wind) must be fully integrated with efficient energy storage and release systems. Electrocatalytic generation of hydrogen and oxygen from water is ideal because hydrogen can be used for energy storage, is transportable, and it can be used to process other storage chemicals such as liquid hydrocarbons. Molecular hydrogen is the ultimate clean fuel, since its combustion produces only water.