Regenerative fuel cell with pH control

摘要

The present invention relates to a process for operating a regenerative fuel cell (RFC). The process involves circulating a first electrolyte (electrolyte 1 ) through the negative chamber of the cell and a second electrolyte (electrolyte 2 ) through the positive chamber of the cell. Electrolyte ( 1 ) contains sulfide during the discharge cycle of the cell. Electrolyte ( 2 ) contains bromine during the discharge cycle of the cell. Decreases in ph in the electrolyte are compensated by circulating a fraction of other electrolyte ( 1 ) or ( 2 ) through the positive chamber of an auxiliary cell. A fraction of electrolyte ( 2 ), which has been made free of bromine, is circulated in the negative chamber of the auxiliary cell.