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DeKalb, Ill. — A research team, led by the U.S. Department of Energy’s (DOE) Argonne National Laboratory in collaboration with Northern Illinois University, has discovered a new electrocatalyst that converts carbon dioxide (CO2) and water into ethanol with very high energy efficiency, high selectivity for the desired final product and low cost.
Ethanol is a particularly desirable commodity because it is an ingredient in nearly all U.S. gasoline and is widely used as an intermediate product in the chemical, pharmaceutical and cosmetics industries.
The report on the discovery, first made in an NIU laboratory and studied in detail at Argonne, is published in the July 27 issue of the prestigious scientific journal, Nature Energy.
The team includes four NIU scientists. It was led by NIU’s Tao Xu, a professor of chemistry specializing in nanotechnology, and Di-Jia Liu, a senior chemist in Argonne’s Chemical Sciences and Engineering division and a UChicago CASE scientist in the Pritzker School of Molecular Engineering, University of Chicago.
“With this research, we’ve discovered a new catalytic mechanism for converting carbon dioxide and water into ethanol,” Xu said. “The unique synthetic method for production of electrocatalysts developed in our NIU lab enables a crucial dynamic interaction between the catalytic metal atoms and the carbon substrate that can efficiently orientate the electrochemical reaction to produce a range of desired organic fuels.”
Catalysts speed up chemical reactions and form the backbone of many industrial processes. For example, they are essential in transforming heavy oil into gasoline or jet fuel. Today, catalysts are involved in over 80 percent of all manufactured products.
The team’s catalyst consists of atomically dispersed copper on a carbon-powder support. By an electrochemical reaction, this catalyst breaks down CO2 and water molecules and selectively reassembles the broken molecules into ethanol under an external electric field. The electrocatalytic selectivity, or “Faradaic efficiency,” of the process is over 90 percent, much higher than any other reported process. What is more, the catalyst operates stably over extended operation at low voltage.
“The process resulting from our catalyst would contribute to the circular carbon economy, which entails the reuse of carbon dioxide,” co-author Liu said. This process would do so by electrochemically converting the CO2 emitted from industrial processes, such as fossil fuel power plants or alcohol fermentation plants, into valuable commodities at reasonable cost.
Because CO2 is a stable molecule, transforming it into a different molecule is normally energy intensive and costly. However, according to Liu, “We could couple the electrochemical process of CO2-to-ethanol conversion using our catalyst to the electric grid and take advantage of the low-cost electricity available from renewable sources like solar and wind during off-peak hours.” Because the process runs at low temperature and pressure, it can start and stop rapidly in response to the intermittent supply of the renewable electricity.
The team’s research benefited from two DOE Office of Science User Facilities at Argonne — the Advanced Photon Source (APS) and Center for Nanoscale Materials (CNM) — as well as Argonne’s Laboratory Computing Resource Center (LCRC).
“Thanks to the high photon flux of the X-ray beams at the APS, we have captured the structural changes of the catalyst during the electrochemical reaction,’’ said co-author Tao Li, an assistant professor in the Department of Chemistry and Biochemistry at NIU and an assistant scientist in Argonne’s X-ray Science division.
These data along with high-resolution electron microscopy at CNM and computational modeling using the LCRC revealed a reversible transformation from atomically dispersed copper to clusters of three copper atoms each on application of a low voltage. The CO2-to-ethanol catalysis occurs on these tiny copper clusters. This finding is shedding light on ways to further improve the catalyst through rational design.
“We have prepared several new catalysts using this approach and found that they are all highly efficient in converting CO2 to other hydrocarbons,” Liu said. “We plan to continue this research in collaboration with industry to advance this promising technology.”
Support for the research came from Argonne’s Laboratory Directed Research and Development (LDRD) fund provided by the DOE Office of Science and from the DOE Office of Basic Energy Sciences. Other authors on the research publication include Haiping Xu and Dominic Rebollar, who both earned Ph.D.s from NIU in May, along with Haiying He, Lina Chong, Yuzi Liu, Cong Liu, Cheng-Jun Sun, John V. Muntean and Randall E. Winans.
Media Contact: Tom Parisi
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