A hybrid solar thermal/electrochemical process combines efficient photovoltaic devices and concentrated excess sub-bandgap heat into highly efficient elevated temperature solar electrolysis of water to generate H2 fuel. Efficiency is further enhanced by excess super-bandgap and non-solar sources of heat but diminished by losses in polarization and photo-electrolysis power matching. As also shown earlier in Chapter 4 and elaborated further here, solar concentration can provide the high temperature and diminish the requisite surface area of efficient electrical energy conversion components. High temperature electrolysis components are commercially available, suggesting that highly efficient solar generation of H2 will be ultimately attainable.
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