Renewable clean hydrogen which does not contain any environmental issues is a desirable energy storage carrier and an efficient fuel; it has the highest energy per mass (142kJg -1 ) of any fuel. For multiple decades, the major hurdle to development of the GHE has been that hydrogen is difficult to store. Its low ambient temperature density results in a low energy per unit volume, therefore requiring the development of advanced, safe, and efficient storage methods with potential for high energy density. Hydrogen can be stored in several ways including physical-based and chemical-based storage.