Fe-doped NiCoP/Prussian blue analog hollow nanocubes as an efficient electrocatalyst for oxygen evolution reaction

Fabrication of highly efficient and earth-abundant electrocatalysts for oxygen evolution reaction (OER) is vital renewable energy production. In this work, the Fe-doped NiCoP/Prussian blue analog hollow porous nanocubes (Fe-NiCoP/PBA HNCs) were synthesized through a facile cation exchange of NiCo PBA HNCs followed by the phosphidation treatment. The optimal 2.5Fe-NiCoP/PBA HNCs exhibits a low OER overpotential of 290 mV at a current density of 10 mA cm‒2 and good stability, which is superior to the reported PBA-derived OER electrocatalyst. This high OER activity can be ascribed to the synergy effects of interfacial structure of Fe-NiCoP and PBA as well as the hollow porous structures, which could improve the electron transfer rate, reduce the reaction kinetics and expose more active sites. This work underscores that formation of multiple active components derived from the PBA is an effective strategy for designing high performance OER catalysts.