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The University of Tennessee, Knoxville team will develop an energy storage system based on an innovative electrolyzer/fuel cell combination. Typically, fuel cells make water from hydrogen and oxygen, which can be stored in tanks. The Tennessee team will instead use the fuel cell to produce hydrogen peroxide: a liquid that can be easily stored and converted to oxygen. When extra power is needed on the grid, the fuel cell will produce peroxide and electricity. Available electricity then can be used to efficiently convert the peroxide back to oxygen during the charging cycle.