Water splitting direct electrolysis

S 17.3 million Renewables - direct water splitting using solar energy thermal processes using biomass advanced electrolysis from wind power. 

The table shows that hydrogen can be produced directly from combustible fuels by gasification, partial oxidation, or steam reforming or from non-combustible resources, primarily by low- or high-temperature electrolysis (water splitting). Hydrogen could in principle be produced from electricity generated from combustible resources, but it would entail... 

Establishing an interesting reference case for multijunction solar water splitting, multijunction PV cells with adequate useable photopotential to directly drive electrolysis have been coupled with electrolyzer systems, which can be separate or fully integrated. This approach is compatible with the PV-electrolysis reactor types described in Sect. 7.2.4. However, since the PV output of the multijunction cell is designed to have direct compatibility with electrolysis, no power conditioning units are required. A device level schematic is shown in Fig. 7.26 for the case of a triple-junction PV cell driving the electrolyzer reactions. The useable potential... 

In the charge, or electrolysis mode, the process splits water into hydrogen and oxygen and can produce hydrogen directly without mechanical compression. Water enters the cell and is split at the surface of the membrane to form protons, electrons and gaseous oxygen. 

Central station plant Midsize plant Distributed Steam reforming Steam reforming Steam reforming Gasifier Thermal splitting of water Gasifier or direct conversion Electrolysis Electrolysis Electrolysis... 

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