By exchanging the DBEAQ negolyte for Fe(DIPSO), an iron complex negolyte species that operates at pH about 13, we achieved a pH-decoupled all-iron ARFB with OCV around 1.8 V (Extended Fig. ; Fig. ). Maintaining high pH is essential for the stability of Fe(DIPSO), as it precipitates from solution at lower pH. Long-term cycling with either exogenous acid-base addition or in situ pH recovery exhibited a low fade rate and pH recovery overpotential similar to the other model systems.