The present invention relates to a redox flow battery comprising at least one electrochemical cell in fluid communication with an equilibration cell, the equilibration cell comprising a first half-cell chamber and a second half-cell chamber, wherein the first half-cell the chamber is re second electrode redox flow includes a first electrode that is in contact with the first aqueous electrolyte of the battery, wherein the second inverted if the chamber is a second electrode in contact with the second water-soluble electrolyte, and is of the O 2 catalyst for generation.
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