Hollow Structure Derived Phosphide Nanosheets for Water Oxidation

Abstract

AbstractAvoiding the stacking of active sites in catalyst structural design is a promising route for realizing active oxygen evolution reaction (OER). Herein, using a CoFe Prussian blue analoge cube with hollow structure (C‐CoFe PBA) as a derived support, a highly effective Ni2P‐FeP4‐Co2P catalyst with a larger specific surface area is reported. Benefiting from the abundant active sites and fast charge transfer capability of the phosphide nanosheets, the Ni2P‐FeP4‐Co2P catalyst in 1 m KOH requires only overpotentials of 248 and 277 mV to reach current density of 10 and 50 mA cm−2 and outperforms the commercial catalyst RuO2 and most reported non‐noble metal OER catalysts. In addition, the two‐electrode system consisting of Ni2P‐FeP4‐Co2P and Pt/C is able to achieve a current density of 10 and 50 mA cm−2 at 1.529 and 1.65 V. This work provides more ideas and directions for synthesizing transition metal catalysts for efficient OER performance.