Fe-doped CoFe–P phosphides nanosheets dispersed on nickel foam derived from Prussian blue analogues as efficient electrocatalysts for the oxygen evolution reaction

Exploration of a highly effective, durable non-precious metal-based catalyst in oxygen evolution reaction remains a major challenge in the process of developing and utilizing hydrogen energy by electrocatalytic splitting water (OER). This study developed a simple and efficient method to synthesize CoFe-PBA by directly growing the Prussian blue analogues (PBAs) precursor on a self-supporting electrode with a conductive substrate, which is further phosphorized into CoFe–P/NF electrocatalyst. The high conductivity and large surface area of NF could accelerate electron transmission and increase the number of active sites. Fe incorporation could also enhance electronic structure and optimize adsorbate energy. The obtained CoFe–P/NF exhibits excellent electrocatalytic performance for the OER in 1 ​M KOH, which only provides overpotentials of 264 and 278 ​mV at current densities of 100 and 200 ​mA ​cm−2, respectively, and exhibits excellent durability over 120 ​h. This method provides a feasible strategy for exploring high-efficiency oxygen evolution reaction catalysts.