A Comprehensive Review on Two-Step Thermochemical Water Splitting for Hydrogen Production in a Redox Cycle

The interest in and need for carbon-free fuels that do not rely on fossil are constantly growing from both environmental energetic perspectives. Green hydrogen production is at the core of transition away conventional fuels. Along with popularly investigated pathways production, thermochemical water splitting using redox materials an interesting option utilizing thermal energy, as this approach makes use temperature looping over material to produce water. Herein, two-step processes discussed key aspects analyzed most relevant information present literature. Redox their compositions, which have been proven be efficient reaction, reported. Attention focused non-volatile oxides, quenching step required volatile unnecessary. Reactors could used conduct reduction oxidation reaction discussed. promising compared each other a multi-criteria analysis, providing direction future research. As evident, ferrite supported yttrium-stabilized zirconia, ceria doped zirconia or samarium nickel yttrium (III) oxide shell choices. Isothermal cycling lowering outlined directions towards increasing yields improving cyclability.