A redox flow acid-gas capture system includes an electrochemical cell including a cathode configured to contact a stream including an electroactive species in an inactive state and provide a reduced stream including the electroactive species in an active state, and an anode configured to contact an adduct stream including an adduct of an electroactive species and an acid-gas and provide an oxidized stream including the electroactive species in the inactive state and the acid-gas; an absorber configured to contact the reduced stream and the acid-gas and form the adduct stream including the adduct of the electroactive species and the acid-gas; and at least one of an oxygen stripper unit, or a degasser unit configured to provide a degassed stream including the electroactive species in an inactive state, and an acid-gas stream.