Amorphous Iron-Doped Nickel Selenide Film on Nickel Foam via One-Step Electrodeposition Method for Overall Water Splitting

摘要

The highly efficient and stable electrocatalysts based on non-noble metals are a crucial section for the design and development of the alkaline water electrolysis cell, which is one of the ideal pathways for the production of hydrogen energy. Hence, in this work, we reported an efficient and robust bifunctional material through a simple and fast electrodeposition method; nickel selenide doped with different amounts of the iron amorphous film was directly loaded on a macroporous Ni foam to form the various electrodes (named as NiFeSe-X/Ni foam electrode). The NiFeSe-4/Ni foam electrode had the best water oxidation activity of all the electrodes tested, and a relatively low overpotential of 235 mV was required to attain a current density of 100 mA/cm(2) in 1.0 M KOH. Furthermore, in basic solutions, this electrode exhibits outstanding catalytic activity for hydrogen evolution reactions. At a cell voltage of 1.7 V, the alkaline water electrolyzer equipped with this bifunctional electrode may achieve water splitting at a current density of 50 mA/cm(2).