ELECTROCHEMICAL ENERGY STORAGE SYSTEMS AND METHODS FEATURING LARGE NEGATIVE HALF-CELL POTENTIALS

摘要

The invention concerns flow batteries comprising: a first half-cell comprising: (i) a first aqueous electrolyte comprising a first redox active material; and a first carbon electrode in contact with the first aqueous electrolyte; (ii) a second half-cell comprising: a second aqueous electrolyte comprising a second redox active material; and a second carbon electrode in contact with the second aqueous electrolyte; and (iii) a separator disposed between the first half-cell and the second half-cell; the first half-cell having a half-cell potential equal to or more negative than about −0.3 V with respect to a reversible hydrogen electrode; and the first aqueous electrolyte having a pH in a range of from about 8 to about 13, wherein the flow battery is capable of operating or is operating at a current density at least about 25 mA/cm2.

主权项

1. A flow battery comprising:
a first half-cell comprising:
a first aqueous electrolyte comprising a first redox active material, and a first carbon electrode in contact with the first aqueous electrolyte; a second half-cell comprising:
a second aqueous electrolyte comprising a second redox active material, and a second carbon electrode in contact with the second aqueous electrolyte; and a separator disposed between the first half-cell and the second half-cell;
wherein the first half-cell has a half-cell potential ranging between −0.3 V and −0.7 V with respect to a reversible hydrogen electrode, and the first redox active material exhibits substantially reversible electrochemical kinetics.