000214744 001__ 214744
000214744 005__ 20190317000340.0
000214744 0247_ $$2doi$$a10.1073/pnas.1513488112
000214744 022__ $$a1091-6490
000214744 037__ $$aARTICLE
000214744 245__ $$aRound-the-clock power supply and a sustainable economy via synergistic integration of solar thermal power and hydrogen processes
000214744 269__ $$a2015
000214744 260__ $$c2015
000214744 336__ $$aJournal Articles
000214744 520__ $$aWe introduce a paradigm-"hydricity"-that involves the coproduction of hydrogen and electricity from solar thermal energy and their judicious use to enable a sustainable economy. We identify and implement synergistic integrations while improving each of the two individual processes. When the proposed integrated process is operated in a standalone, solely power production mode, the resulting solar water power cycle can generate electricity with unprecedented efficiencies of 40-46%. Similarly, in standalone hydrogen mode, pressurized hydrogen is produced at efficiencies approaching similar to 50%. In the coproduction mode, the coproduced hydrogen is stored for uninterrupted solar power production. When sunlight is unavailable, we envision that the stored hydrogen is used in a "turbine"-based hydrogen water power (H2WP) cycle with the calculated hydrogen-to-electricity efficiency of 65-70%, which is comparable to the fuel cell efficiencies. The H2WP cycle uses much of the same equipment as the solar water power cycle, reducing capital outlays. The overall sun-to-electricity efficiency of the hydricity process, averaged over a 24-h cycle, is shown to approach similar to 35%, which is nearly the efficiency attained by using the best multijunction photovoltaic cells along with batteries. In comparison, our proposed process has the following advantages: (i) It stores energy thermochemically with a two-to threefold higher density, (ii) coproduced hydrogen has alternate uses in transportation/chemical/petrochemical industries, and (iii) unlike batteries, the stored energy does not discharge over time and the storage medium does not degrade with repeated uses.
000214744 6531_ $$asolar
000214744 6531_ $$aelectricity
000214744 6531_ $$ahydrogen
000214744 6531_ $$asolar thermal power
000214744 6531_ $$aprocess synthesis
000214744 700__ $$aGençer, Emre
000214744 700__ $$aMallapragada, Dharik S.
000214744 700__ $$0240374$$aMaréchal, François$$g140973
000214744 700__ $$aTawarmalani, Mohit
000214744 700__ $$aAgrawal, Rakesh
000214744 773__ $$j112$$k52$$q15821-15826$$tProceedings of the National Academy of Sciences
000214744 8564_ $$s868023$$uhttps://infoscience.epfl.ch/record/214744/files/PNAS-2015-Gen%C3%A7er-15821-6.pdf$$yPublisher's version$$zPublisher's version
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000214744 937__ $$aEPFL-ARTICLE-214744
000214744 973__ $$aEPFL$$rNON-REVIEWED$$sPUBLISHED
000214744 980__ $$aARTICLE