Publication Date:
2013-08-03
Description:
Solar thermal water-splitting (STWS) cycles have long been recognized as a desirable means of generating hydrogen gas (H2) from water and sunlight. Two-step, metal oxide-based STWS cycles generate H2 by sequential high-temperature reduction and water reoxidation of a metal oxide. The temperature swings between reduction and oxidation steps long thought necessary for STWS have stifled STWS's overall efficiency because of thermal and time losses that occur during the frequent heating and cooling of the metal oxide. We show that these temperature swings are unnecessary and that isothermal water splitting (ITWS) at 1350 degrees C using the "hercynite cycle" exhibits H2 production capacity 〉3 and 〉12 times that of hercynite and ceria, respectively, per mass of active material when reduced at 1350 degrees C and reoxidized at 1000 degrees C.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Muhich, Christopher L -- Evanko, Brian W -- Weston, Kayla C -- Lichty, Paul -- Liang, Xinhua -- Martinek, Janna -- Musgrave, Charles B -- Weimer, Alan W -- New York, N.Y. -- Science. 2013 Aug 2;341(6145):540-2. doi: 10.1126/science.1239454.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80303, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23908235" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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