Abstract
Harnessing the power of the sun to produce energy-rich chemicals from abundant resources offers the promise of providing a plentiful supply of sustainable solar fuels to meet future U.S. energy needs. Opportunities for producing strategically-important solar fuels include hydrogen from water, hydrocarbon fuels from carbon dioxide and hydrogen/water, and ammonia from di-nitrogen and hydrogen/water. Most fuels are currently produced from fossil resources using energy-intense high temperature processes, but advanced processes for fuel synthesis utilizing sunlight in conjunction with air and water can provide critical supplements to help meet near- and longer-term energy demands. Most pathways for solar fuels rely heavily on the availability of an abundant and sustainable hydrogen supply. More generally, synthetic fuels production is an important end-use sector supported by the U.S. Department of Energy’s (DOE) H2@scale initiative. Specific challenges and opportunities for a new generation of solar fuels production will be discussed in the context of H2@Scale as well as other DOE efforts including the Fuels from Sunlight Energy Innovation Hub and the HydroGEN Energy Materials Network Consortium on Advanced Water Splitting Materials.
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