REDOX FLOW BATTERY SYSTEM WITH ANCILLARY CELL FOR pH ADJUSTMENT

A redox flow battery system includes a redox flow battery (RFB) and an ancillary cell. The ancillary cell includes an anode fluidly connected with the RFB to receive a first electrolyte solution, a cathode fluidly connected with the RFB to receive a second electrolyte solution, and an ionic diode membrane between the anode and the cathode. The ancillary cell serves to control pH of the electrolytes.