Chemistry professor Prashant Jain led a study that uses solar energy to power a key chemical reaction that drives many manufacturing industries. This new method can significantly reduce the energy required to run these operations, eliminate harsh oxidizing byproducts and minimize carbon emissions.
Photo Credit: Courtesy of University of Illinois Urbana-Champaign
Scientific Frontline: Extended "At a Glance" Summary: Plasmon-Assisted Electrochemical Epoxidation
The Core Concept: A novel methodology that utilizes solar energy and light-absorbing "antenna" catalysts to power olefin epoxidation, significantly reducing the energy required and the carbon emissions produced during chemical manufacturing.
Key Distinction/Mechanism: The current industry standard requires harsh peroxides to facilitate oxidation reactions or relies on highly energy-intensive, high-temperature conditions to break down water as an alternative. This new method overcomes these hurdles by using visible-light photons (via lasers) alongside gold nanoparticles and manganese oxide nanowire electrodes to induce strong electric fields. This weakens the H-O-H bonds in water and double bonds in chemical compounds like styrene, turning water into an effective oxidant without the need for extreme heat or toxic byproducts.
Origin/History: The technique builds upon a relatively new concept developed around 2018, which originally boosted electrochemistry with light energy for ammonia synthesis and \(C_2O\) reduction. The current application to industrially relevant epoxidation reactions was recently pioneered by researchers at the University of Illinois Urbana-Champaign, including chemistry professor Prashant Jain and researcher Lucas Germano.
Major Frameworks/Components:
- Plasmonic Chemistry: The use of solar/light energy to power and drive chemical reactions.
- Antenna Catalysts: Nanostructures, specifically gold nanoparticles and manganese oxide nanowire electrodes, designed to absorb visible-light photons and generate energetic charge carriers.
- Plasmon-Assisted Electrochemical Epoxidation: The specific chemical pathway used to pluck oxygen atoms from water and add them across a double bond to form an epoxide.
- Visible-Light Photons: Currently supplied by laboratory-scale lasers to initiate the weakening of molecular bonds.
Branch of Science: Physical Chemistry, Electrochemistry, and Plasmonic Chemistry.
Future Application: The scaling of this technology to engineer large, light-accessible electrolyzer systems using energy-efficient light sources instead of lasers. This will allow the commercial production of epoxide chemicals without generating heavy carbon footprints or toxic waste.
Why It Matters: Epoxides are the chemical backbone of the textile, plastic, chemical, and pharmaceutical industries. Transitioning to a solar-powered, water-oxidant model eliminates hazardous peroxide disposal, drastically lowers energy consumption, and provides a highly sustainable path forward for global manufacturing.
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| A schematic of plasmon-assisted electrochemical epoxidation of styrene on a GCE, or glassy carbon electrode, coated with gold and manganese oxide nanostructures, under the illumination of a 532-nanometer laser light source. In this graphic, H = hydrogen, C = carbon, O = oxygen and S = sulfonate from styrene oxidation. Illustration Credit: Courtesy of Prashant Jain |
Researchers have found a way to use solar energy to power a key chemical reaction that drives many manufacturing industries. This new method can significantly reduce the energy required to run these operations, eliminate harsh oxidizing byproducts and minimize carbon emissions.
Olefin epoxidation is not a process many are familiar with, but the epoxide chemicals it produces are the backbone of the textile, plastic, chemical and pharmaceutical industries. However, the current industry-standard process uses harsh peroxides to facilitate oxidation reactions, which are difficult to dispose of safely and emit carbon dioxide. Water can be used as an oxidant instead of peroxides, but \(H_2O\) bonds are difficult to break, requiring high-temperature conditions, making it highly energy-intensive and further contributing to \(C_2O\) emissions.
A greener alternative could significantly shrink the industry’s carbon footprint.
University of Illinois Urbana-Champaign chemistry professor Prashant Jain’s research group is recognized for its work using solar energy as a power source in a process called plasmonic chemistry to help green up industrial processes. Using this process to recycle inorganic carbon dioxide into chemical fuels is one of the group’s hallmarks.
If successful, we knew that our new methodology could mark a significant advance in both the chemical manufacturing industry and in the study of electrochemistry in general.”
“Boosting electrochemistry with light energy, a relatively new concept developed around 2018, was first applied to ammonia synthesis and \(C_2O\) reduction with promising results,” Jain said. “The current study is the result of hypothesizing that this technique could apply to industrially relevant epoxidation reactions. If successful, we knew that our new method could mark a significant advance in both the chemical manufacturing industry and in the study of electrochemistry in general.”
The new study, led by Jain, Susana Inés Córdoba de Torresi at the Universidade de São Paulo and George Schatz at Northwestern University, is published in the Journal of the American Chemical Society.
A standout contribution to the new study, led by former Illinois researcher and co-author Lucas Germano, is the use of light-absorbing “antenna” catalysts made from gold nanoparticles and manganese oxide nanowire electrodes. This design combines the power of electricity and energy from visible-light photons to break the H-O-H bonds in water, effectively turning water into an oxidant without requiring high-temperature heating.
A schematic of plasmon-assisted electrochemical epoxidation of styrene on a GCE, or glassy carbon electrode, coated with gold and manganese oxide nanostructures, under the illumination of a 532-nanometer laser light source. In this graphic, H = hydrogen, C = carbon, O = oxygen and S = sulfonate from styrene oxidation. Graphic courtesy Prashant Jain
“Visible light photons, supplied by laboratory-scale lasers, are absorbed by these nanoparticles, inducing strong electric fields and energetic charge carriers, which weaken the strong O-H bonds in \(H_2O\) and the double bond in styrene,” Jain said. “The weakened bonds allow O atoms to be plucked out from \(H_2O\) and added across the double bond to form an epoxide in a marvelous reaction catalyzed by light.”
Jain said that although their laboratory demonstration offers a solution to an important problem, scaling it up for industry will be challenging. The next steps will be to replace lasers as the main light source with scalable, energy-efficient light sources, to better control light-driven reactions to prevent overoxidation, and to engineer large, light-accessible electrolyzer systems that scale up the activity observed in lab-scale reactors.
Funding: The National Science Foundation, São Paulo Research Foundation and the Department of Energy supported this research.
Published in journal: Journal of the American Chemical Society
Title: Plasmon-Assisted Electrochemical Epoxidation using Water as an Oxidant
Authors: Lucas Dias Germano, Sajal Kumar Giri, Chloe Anne Litts, Francis M. Alcorn, George C. Schatz, Susana Inés Córdoba de Torresi, and Prashant K. Jain
Source/Credit: University of Illinois Urbana-Champaign | Lois Yoksoulian
Reference Number: chm030426_01
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