ABSTRACT
The continuous rapid increase of CO2 emission from the consumption of fossil fuels has attracted much attention with respect to energy sustainability and the influence on the environment. Hydrogen production has gained growing interest because of the need for a clean, nonpolluting fuel, or energy carrier, to replace fossil fuels. One promising method of hydrogen generation is from water by means of metals. The appropriate material for this goal includes Fe, Al, Zn, B, and so on, which possesses properties such as high efficiency, availability, and environmental safety. The aim of this review is to introduce the approaches and strategies of hydrogen production with iron under mild hydrothermal conditions, which will be beneficial for practical considerations.
