FE-CR REDOX FLOW BATTERY SYSTEMS AND METHODS UTILIZING CHROMIUM COMPLEXES WITH NITROGEN-CONTAINING LIGANDS

A redox flow battery system includes an anolyte having chromium ions in solution, wherein at least a portion of the chromium ions form a chromium complex with at least one of the following: NH, NH, CO(NH), SCN, or CS(NH); a catholyte having iron ions in solution; a first half-cell including a first electrode in contact with the anolyte; a second half-cell including a second electrode in contact with the catholyte; and a first separator separating the first half-cell from the second half-cell.