Searching for Photocathodes that Convert CO2 into Fuels

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id="Breadcrumbs"> <div class="wrapper"> <div> <a href="/">Home</a> » <a href="/news-publications/nersc-news/">News</a> » <a href="/news-publications/nersc-news/">News</a> » <a href="/news-publications/nersc-news/science-news/">Science News</a> » Searching for Photocathodes that Convert CO2 into Fuels </div> </div> </div>   <main> <div class="main"> <div class="main-wrapper"> <div class="pre_content"> <h1 id="page-heading">Searching for Photocathodes that Convert CO2 into Fuels</h1> <h2 class="SubTitle">NERSC's support of Berkeley Lab's Materials Project opens new avenues of research</h2> <p class="DateAuthors"> <span class="Date">April 8, 2019</span> </p> <div class="Contact"> <div class="Contact"> <p>By Jennifer Huber<br>Contact: <a title="cscomms@lbl.gov" href="/cdn-cgi/l/email-protection#be989d878785989dc6898d85989d878785989dc688d885989d8f8e8785989dc688da85989d8f8f8b85989dc68a8e85989d8f8e8685989dc6888c85989d8f8e8685989dc68cdb85989d8f8e8d85989dc688d885989d8f8f8685">cscomms@lbl.gov</a></p> </div> </div> </div> <section> <section><div class="Content"><div class="captionImage right" style="width: 450px;"><img src="/assets/Uploads/CO2Reduction__ResizedImageWzQ1MCwzMzhd.jpg" alt="Six-step selection criteria diagram for CO2 reduction" class="right" width="450" height="338" loading="lazy"> <p class="caption right">Six-step selection criteria used in the search for photocathodes for CO2 reduction. The search began with 68,860 inorganic compounds. The number of materials that satisfied the requirements of each step are shown in red, with 52 meeting all the requirements.</p> </div><p>Carbon dioxide (CO<sub>2</sub>) has a bad reputation due to its pivotal role in the greenhouse gas effect at the Earth’s surface. But scientists at the <a title="JOINT CENTER FOR ARTIFICIAL PHOTOSYNTHESIS" href="https://solarfuelshub.org/" target="_blank">Joint Center for Artificial Photosynthesis</a> (JCAP), a U.S. Department of Energy (DOE) Innovation Hub, view CO<sub>2</sub> as a promising solution to clean, low-cost, renewable energy.</p><p>JCAP is a team led by the California Institute of Technology (Caltech) that brings together more than 100 world-class scientists and engineers, primarily from Caltech and its lead partner, Lawrence Berkeley National Laboratory (Berkeley Lab).</p><p>The JCAP team is developing new ways to produce transportation fuels from CO<sub>2</sub>, sunlight, and water using a process called artificial photosynthesis, which harvests solar energy and stores it in chemical bonds. If successful, they’ll be able to produce fuels while also eliminating some CO<sub>2</sub> — a “win-win,” according to Arunima Singh, an assistant professor of physics at Arizona State University and a former member of the JCAP team.</p><p>Singh became involved in the research as a postdoctoral associate at Berkeley Lab, where she searched for new photocathodes to efficiently convert CO<sub>2 </sub>to chemical fuels — a major hurdle to realizing scalable artificial photosynthesis.</p><p>“There is a dire need to find new materials to enable the photocatalytic conversion of CO<sub>2</sub>. The existing photocathodes have very low efficiencies and product selectivity,” said Singh. “Previous experimental attempts found new photocatalytic materials by trial and error, but we wanted to do a more directed search.”</p><h2>Searching for Needles in a Materials Project Haystack</h2><p>Using supercomputing resources at the National Energy Research Scientific Computing Center (NERSC), the Berkeley Lab team performed a massive photocathode search, starting with 68,860 materials and screening them for specific intrinsic properties. Their results were <a title="Robust and synthesizable photocatalysts for CO2 reduction: a data-driven materials discovery" href="https://www.nature.com/articles/s41467-019-08356-1">published</a> in the January issue of <em>Nature Communications</em>.</p><p>“The candidate materials need to be thermodynamically stable so they can be synthesized in the lab. They need to absorb visible light. And they need to be stable in water under the highly reducing conditions of CO<sub>2</sub> reduction, ” said first author Singh. “These three key properties were already available through the Materials Project.”</p><p>The <a title="The Materials Project" href="https://materialsproject.org/" target="_blank">Materials Project</a> is a DOE-funded database of materials properties calculated based on predictive quantum-mechanical simulations using supercomputing clusters at NERSC, which is a DOE Office of Science User Facility. The database includes both experimentally known materials and hypothetical structures predicted by machine learning algorithms or various other procedures. Of the 68,860 candidate materials screened in the <em>Nature Communications</em> study, about half had already been experimentally synthesized, while the remaining were hypothetical.</p><p>The researchers screened these materials in six steps. First they used the Materials Project to identify the materials that were thermodynamically stable, able to absorb visible light, stable in water, and electrochemically stable. This strategy reduced the candidate pool to 235 materials — dramatically narrowing the list for the final two steps, which required computationally intensive calculations.</p><p>“By leveraging a large amount of data already available in the Materials Project, we were able to cut the computational cost of the project by several millions of CPU hours,” said Kristin Persson, a faculty scientist in Berkeley Lab’s Energy Technologies Area and senior author on the paper.</p><h2>Additional Screening with First-Principles Calculations</h2><p>However, the Materials Project database did not have all the necessary data. So the final screening required new first-principles simulations of materials properties based on quantum mechanics to accurately estimate the electronic structures and understand the energy of the excited electrons. These calculations were computed at NERSC and the Texas Advanced Computing Center (TACC) for the remaining 235 candidate materials.</p><p>“NERSC is the backbone of the Materials Project computation and database. But we also used about two million NERSC core hours to do the step 5 and 6 calculations,” said Singh. “Without NERSC, we would have been running our simulations on 250 cores for 24 hours a day for a year, versus being able to do these calculations in parallel on NERSC in a matter of a few months.”</p><p>The team also used about half a million core hours for these calculations at TACC, which were allocated through the National Science Foundation’s Extreme Science and Engineering Discovery Environment (XSEDE).</p><p>These theoretical calculations showed that 52 materials met all of the stringent requirements of the screening process, but that only nine of these had been previously studied for CO<sub>2</sub> reduction. Among the 43 newly identified photocathodes, 35 have previously been synthesized and eight are hypothetical materials.</p><p>“We performed the largest exploratory search for CO<sub>2</sub> reduction photocathodes to date, covering 68,860 materials and identifying 43 new photocathode materials exhibiting promising properties,” Persson said.</p><p>Finally, the researchers narrowed the list down to 39 promising candidates by looking at the vibrational properties of the eight hypothetical materials and ruling out the four predicted to be unstable by themselves.</p><p>However, more work is needed before artificial photosynthesis becomes are reality, including working with their experimental colleagues like Caltech’s John Gregoire (a leader of JCAP’s high-throughput experimentation laboratory) to validate their computational results.</p><p>“We have collaborators at Berkeley Lab and Caltech who are actively trying to grow these materials and test them,” Singh said. “I’m excited to see our study opening up new avenues of research.”</p><p><em><em>Jennifer Huber is a freelance science writer and science-writing instructor. <span><span>Her work has appeared in KQED Science, Berkeley Engineer and Scope, among other publications.</span></span></em></em></p></div></section> <hr /> <div class="AboutBoilerplate"><p><strong>About NERSC and Berkeley Lab</strong><br> The National Energy Research Scientific Computing Center (NERSC) is a U.S. Department of Energy Office of Science User Facility that serves as the primary high performance computing center for scientific research sponsored by the Office of Science. Located at Lawrence Berkeley National Laboratory, NERSC serves almost 10,000 scientists at national laboratories and universities researching a wide range of problems in climate, fusion energy, materials science, physics, chemistry, computational biology, and other disciplines. <a href="http://www.lbl.gov/">Berkeley Lab</a> is a DOE national laboratory located in Berkeley, California. It conducts unclassified scientific research and is managed by the University of California for the U.S. Department of Energy. »<a href="http://cs.lbl.gov">Learn more about computing sciences</a> at Berkeley Lab. </p></div> </section> </div> </div> </main> </div>  <div class="footer"> <div class="LastEdited">Last edited: 2021-12-06 14:30:10</div> <div class="footer-wrapper"> <div class="badges"> <a href="http://www.lbl.gov/" title="Visit Lawrence Berkeley National Laboratory’s main website."><img src="/_resources/themes/nersc-sass/images/berkeley-lab-badge.png?m=1732691280" alt="Berkeley Lab logo" /></a> <a href="http://science.energy.gov/" title="Visit the U.S. Department of Energy Office of Science website."><img src="/_resources/themes/nersc-sass/images/doe-badge.png?m=1732691280" alt="U.S. Department of Energy Office of Science logo" /></a> </div> <ul class="footer-links"> <li><a href="/about/contact-us/">Contact us</a></li> <li><a href="https://www.lbl.gov/Disclaimers.html">Privacy & Security</a></li> <li><a href="https://cs.lbl.gov">Computing Sciences Area</a></li> </ul> </div> </div> </div> </div> <script data-cfasync="false" src="/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js"></script><script type="application/javascript" src="/_resources/themes/nersc-sass/javascript/jquery.min.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/no-console.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/jquery.beautyOfCode.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/dataTables-1.7/media/js/jquery.dataTables.min.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/shadowbox-3.0.3/shadowbox.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/jquery.metadata.2.0/jquery.metadata.min.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/jquery.media.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/jquery.oembed.min.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/jquery.cycle/jquery.cycle.all.min.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/themes/nersc-sass/javascript/jquery-ui-1.8.7.custom/js/jquery-ui-1.8.7.custom.min.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/jquery.expander/jquery.expander.min.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/app/javascript/core.js?m=1732691280"></script> <script type="application/javascript" src="/_resources/themes/nersc-sass/javascript/theme-core.js?m=1732691280"></script> </body> </html>

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Searching for Photocathodes that Convert CO2 into Fuels