University of Tennessee, Knoxville (UT)

The University of Tennessee, Knoxville team will develop an energy storage system based on an innovative electrolyzer/fuel cell combination. Typically, fuel cells produce water from hydrogen and oxygen. The Tennessee team will instead use the fuel cell to produce hydrogen peroxide, a liquid that can be stored. When extra power is needed on the grid, the fuel cell will produce peroxide and electricity. Available electricity then can be used to convert the peroxide back to hydrogen and oxygen during the charging cycle, which can be stored for future use. The benefit of using peroxide rather than water is higher efficiency in both charging and discharging the system.

If successful, DAYS projects will provide new forms of long-duration stationary electricity storage systems that enhance grid resiliency, provide low-cost energy capacity, support grid infrastructure, and enable a greater share of intermittent renewable resources in the generation mix.