Zinc–zinc oxide cycle

<h2 id="process-description">Process description</h2>
<p>The thermochemical two-step <a href="/facts/Water_splitting/zcHkXXDR">water splitting</a> process uses <a href="/facts/Redox/Pyd5RVcj">redox</a> systems:<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a>
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<ul><li><a href="/facts/Dissociation_(chemistry)/gDRGdeSN">Dissociation</a>: <a href="/facts/Zinc_oxide/P7sTyDez">ZnO</a> → <a href="/facts/Zinc/80b1qgk3">Zn</a> + 1/2 O2</li>
<li><a href="/facts/Hydrolysis/JTvwIHPs">Hydrolysis</a>: <a href="/facts/Zinc/80b1qgk3">Zn</a> + <a href="/facts/Water_(molecule)/FFsl65l1">H2O</a> → <a href="/facts/Zinc_oxide/P7sTyDez">ZnO</a> + <a href="/facts/Hydrogen/BoYHjl0J">H2</a></li></ul>
<p>For the first <a href="/facts/Endothermic/06xmHw6Q">endothermic</a> step <a href="/facts/Concentrating_solar_power/VdH6Cyn1">concentrating solar power</a> is used in which zinc oxide is <a href="/facts/Thermal_decomposition/Qqx9RqkW">thermally dissociated</a> at 1,900 °C (3,450 °F) into zinc and oxygen. In the second non-solar <a href="/facts/Exothermic/gCuSvpa4">exothermic</a> step zinc reacts at 427 °C (801 °F) with water and produces <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a> and zinc oxide. The temperature level is realized by using a <a href="/facts/Solar_power_tower/x5J1350Y">solar power tower</a> and a set of <a href="/facts/Heliostat/bA2gyvCR">heliostats</a> to collect the <a href="/facts/Solar_thermal_energy/VHzn41co">solar thermal energy</a>.
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<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Cerium(IV)_oxide%25E2%2580%2593cerium(III)_oxide_cycle/b4SzuGIq">Cerium(IV) oxide–cerium(III) oxide cycle</a></li>
<li><a href="/facts/Copper%25E2%2580%2593chlorine_cycle/wA6xsd07">Copper–chlorine cycle</a></li>
<li>Hydrosol-2</li>
<li><a href="/facts/Hybrid_sulfur_cycle/QMEUJKVw">Hybrid sulfur cycle</a></li>
<li><a href="/facts/Iron_oxide_cycle/3A3v4rnV">Iron oxide cycle</a></li>
<li><a href="/facts/Sulfur%25E2%2580%2593iodine_cycle/AvD14nms">Sulfur–iodine cycle</a></li></ul>

<h2 id="external-links">External links</h2>
<ul><li><a href="https://web.archive.org/web/20110706230820/http://www.ltnt.ethz.ch/people/bburg/MRS05_Burg.pdf">H2 formation by zinc hydrolysis in a hot wall aerosol flow reactor</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Solar Hydrogen Production from a ZnO/Zn Thermo-chemical Cycle Archived July 24, 2008, at the Wayback Machine <a href="http://www.solarpaces.org/Tasks/Task2/SHP.HTM" target="_blank">http://www.solarpaces.org/Tasks/Task2/SHP.HTM</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Project PD10 <a href="http://www.hydrogen.energy.gov/pdfs/review06/pd_10_weimer.pdf" target="_blank">http://www.hydrogen.energy.gov/pdfs/review06/pd_10_weimer.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Novel Method for solar hydrogen generation Archived February 5, 2009, at the Wayback Machine <a href="http://www.switt.ch/files/technologien/Solar%20Hydrogen%20Production_04-014.pdf" target="_blank">http://www.switt.ch/files/technologien/Solar%20Hydrogen%20Production_04-014.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>Solar thermal ZnO-decomposition <a href="https://web.archive.org/web/20060505180329/http://solar.web.psi.ch:80/data/research/zno/roca/" target="_blank">https://web.archive.org/web/20060505180329/http://solar.web.psi.ch:80/data/research/zno/roca/</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
</ol>

Zinc–zinc oxide cycle open-in-new

Zinc–zinc oxide cycle