Efficient Solar‐Assisted O2 Reduction Using a Cofacial Iron Porphyrin Dimer Catalyst Integrated into a p‐CuBi2O4 Photocathode

A cofacial iron porphyrin heterodimer, Fe2TPFPP‐TMP showed high electrocatalytic activity, selectivity, and stability for O2 reduction to H2O both in homogeneous non‐aqueous and heterogeneous neutral aqueous solutions. When it is integrated to FTO/p‐CuBi2O4 (FTO=fluorine doped tin oxide) photocathode prepared by a simple novel method, a remarkable efficient solar‐assisted O2 reduction is achieved in neutral potassium phosphate (KPi) or basic NaOH solutions saturated with O2. An efficient cofacial Fe porphyrin heterodimer catalyst was integrated into the FTO/p‐CuBi2O4 photocathode to achieve efficient solar‐assisted O2 reduction in both neutral and basic media.