By using mild pH decoupling of the electrolytes and a conjoined in situ acid-base regeneration system, we constructed an aqueous organic-iron redox-flow battery with output exceeding 1.7 V, high energy efficiency, and a demonstrated lifetime at least four times that of any previously reported pH-decoupled flow battery. Supercapacitor electrodes were fabricated as follows: High surface area porous carbon powder (purchased from ACS Materials), polyvinylidene fluoride (PVDF) (as a binder, dissolved in Nmethyl-2pyrrolidone (NMP) with 1:40 PVDF/NMP weight ratio), and SuperP carbon black were combined in a slurry with the following weight ratios: 85:10:5 to create the capacitive electrodes.