Abstract
Taking into account rapid technological development and growing global Earth population, the needs for clean energy sources are still unmet. Realizing the limited access to fossil fuels as well as the care for natural environment, the focus onto the clean hydrogen generation is fully justified. Due to its high energy capacity and ecofriendly water as a combustion product, hydrogen can be regarded as an ideal fuel. Moreover, the hydrogen production can be realized via water hydrolysis supported by the solar radiation regarded as clean, inexpensive, and renewable power source available everywhere. Among others, transition metal oxides can be used as materials that capture light and then carry out the solar-to-hydrogen conversion via photo(electro)catalytic or thermochemical path. Recently we can observe enormous numbers of works dedicated to the morphology control at the nanoscale, adding novel functionalities or elaboration of synthesis method that within several minutes provides us nanomaterials capable of decomposing water. In this regard, potential challenges, problems, and recent advances associated with the most popular metal oxide-based semiconductors are discuses in order to further development of efficient large-scale hydrogen-based technologies.
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