Full Breakdown
Transforming Bourbon Waste into High-Performance Energy Storage Solutions
3/26/2026, 3:20:31 AM
Innovative Use of Distillery Byproducts
Researchers at the University of Kentucky have developed a method to convert waste generated by the bourbon industry into high-performance energy-storage materials. Each barrel of bourbon produces between six to ten times its volume in stillage, a mixture of spent grain and water. Traditionally, this byproduct is sold as livestock feed or soil additive after a costly drying process. Josiel Barrios Cossio, a graduate student in chemistry, and his team have demonstrated that this wet stillage can be transformed into carbon materials suitable for supercapacitors and batteries.
Research and Development Process
Barrios Cossio's interest in utilizing stillage arose during a research traineeship with the U.S. National Science Foundation, where he learned about the challenges faced by distilleries. He later collaborated with Friedrich Schiller University Jena in Germany, which had previously developed techniques for converting brewery waste into electrode materials. Upon returning to Kentucky, he sourced stillage from Wilderness Trail Distillery, which provided a significant quantity for experimentation.
The researchers employed hydrothermal carbonization, a process that heats the wet stillage under high pressure to produce hydrochar, a black carbon powder. This hydrochar can be further processed into two types of carbon materials: activated carbon, which has a high surface area ideal for supercapacitors, and hard carbon, which is suitable for battery applications.
Performance and Applications
The team’s experiments revealed that their hydrochar-derived electrodes could store energy comparable to commercial supercapacitors, achieving up to 48 watt-hours per kilogram. They successfully created hybrid supercapacitors that combine the energy capacity of batteries with the rapid discharge capabilities of capacitors, making them particularly useful for electric vehicles and grid stabilization.
Marcelo Guzman, a professor of chemistry and project supervisor, emphasized the potential of this innovation to meet the growing demand for energy storage materials, particularly as Kentucky invests heavily in the battery industry.
Economic and Environmental Implications
The conversion of bourbon waste into energy-storage materials not only addresses the disposal challenges faced by distilleries but also presents a sustainable solution to the increasing demand for energy storage. The researchers are currently conducting a techno-economic analysis to evaluate the commercial viability of scaling up this process.
Official Statements & Responses
Barrios Cossio remarked, “Innovation to convert a waste stream to a supercapacitor is a wonderful example of why the University of Kentucky exists.” Guzman noted, “We think we came on board with that problem at the right time, in the right place, and we could have materials that could be really interesting to the battery industry.”
What's Next
The research team plans to present their findings at the spring meeting of the American Chemical Society and aims to refine their methods for industrial-scale production. They are also exploring the economic feasibility of their approach, supported by the U.S. National Science Foundation.
Verbatim Quotes
- “We could take the stillage as it is, in a dispersion with a lot of water and use that disadvantage as an advantage,” — Josiel Barrios Cossio, Graduate Student, University of Kentucky
- “Hybrid devices are not common. Not common and not easy to make.” — Josiel Barrios Cossio, Graduate Student, University of Kentucky
- “This project allowed us to link with a real-world problem with industries at our state level,” — Marcelo Guzman, Professor of Chemistry, University of Kentucky
