Hollow Structure Derived Phosphide Nanosheets for Water Oxidation
Ying Dong, Jixiang Jiao, Yadong Wang, Jun Yu, Shichun Mu
Abstract
Abstract Avoiding 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 Ni 2 P‐FeP 4 ‐Co 2 P 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 Ni 2 P‐FeP 4 ‐Co 2 P 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 RuO 2 and most reported non‐noble metal OER catalysts. In addition, the two‐electrode system consisting of Ni 2 P‐FeP 4 ‐Co 2 P 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.