Abstract

One of the greatest threats to the environment and nonrenewable energy sources are fossil fuels. Recently, emission standards have challenged the dominance of fossil fuels. As a response to such an approach and in the context of business, the energy industry has shown great interest in emission-free and renewable fuels. Hydrogen-based energy sources are the ideal candidate with the benefit of high and clean energy. Hydrogen is an important part of a developed nation's renewable and clean energy plans. Conventionally, photoanodes have been prepared using different routes, i.e., hydrothermal, layer by layer, sol∇gel, and chemical vapor deposition. Similarly, hydrogen production by photoelectrochemical (PEC) water splitting is also an attractive method to store solar energy in chemical form. In this entry, we discuss hydrogen fuel as an alternative energy source and overview the recent trends in hydrogen storage using the PEC water splitting technique.