Patent Number: US9556528B2
Hybrid thermochemical water splitting systems are disclosed that thermally reduces metal oxides particles to displace some but not all of the electrical requirements in a water splitting electrolytic cell. In these hybrid systems, the thermal reduction temperature is significantly reduced compared to two-step metal-oxide thermochemical cycles in which only thermal energy is required to produce hydrogen from water. Also, unlike conventional higher temperature systems where the reduction step must be carried out under reduced oxygen pressure, the reduction step in the proposed hybrid systems can be carried out in air, allowing for thermal input by a solar power tower with a windowless, cavity receiver.
Diver, Richard B. Jr.; Palumbo, Robert D.; Siegel, Nathan P.; and Miller, James E., "Hybrid metal oxide cycle water splitting" (2017). Other Faculty Research and Publications. 136.