Construction of hierarchical P/Ni-Ag@AgCoPBA hollowstructures for boosting water oxidation activity

Abstract

Prussian blue analogue (PBA) is considered as one of the promising candidate materials as OER catalysts owing to its surface reconstruction to form M−OH/M−O species, serving as real active species. Herein, a novel P/Ni co-doped hierarchical Ag3[Co(CN)6] hollow microcuboids (P/Ni-Ag@AgCoPBA HHMCs) assembled from two-dimensional nanosheets are constructed for the first time. Benefitting from the unique hierarchical hollowstructures, controllable compositions and the abundant exposed active sites resulting from deep reconstruction, the P/Ni-Ag@AgCoPBA HHMCs show excellent activity with an overpotential (0.245 V) at 10 mA cm−2, and it can work smoothly for 24 h in alkaline electrolyte.