Facile Preparation of a Porous Nanosheet PX‐Doped Fe Bi‐Functional Catalyst with Excellent OER and HER Electrocatalytic Activity

Abstract

AbstractThe principal factor restricting large‐scale hydrogen production via water electrolysis is the development of inexpensive and efficient catalysts that attain high current densities to produces hydrogen at low potentials. In this study, a series of iron‐based phosphide catalysts (denoted as: PX‐doped Fe/NF) were prepared via one‐step electrodeposition from a eutectic solvent to examine their oxygen evolution reaction (OER) or hydrogen evolution reaction (HER) performance. Notably, P30‐doped Fe/NF forms a porous interconnected nanosheet structure, providing a large active surface areas, abundant active sites and low charge transfer resistance. P30‐doped Fe/NF attained the lowest OER (284.15 mV) and HER (158.17 mV) overpotentials at 10 mA cm−2 in 1.0 M KOH of all the tested catalysts. When used in overall water splitting, the catalyst displayed outstanding adaptability to a range of potentials and current densities. This study provides a facile route for the synthesis of bifunctional transition‐metal phosphide catalysts for the electrolysis of water.