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

Abstract

The 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.

Fe‐Doped Porous g‐C3N4: An Efficient Electrocatalyst with Fe‐N Active Sites for Electrocatalytic Hydrogen Evolution Reaction under Alkaline Conditions

“…[1,2] However, the electrocatalytic hydrogen evolution reaction (HER) of electrolyzed water is slow in kinetics, which requires efficient electrocatalysts to reduce overpotentials, promote reaction kinetics, and improve electrical energy efficiency. [3][4][5] Pt-based catalysts usually show excellent catalytic performance for HER, [6,7] but the low reserves and high cost of precious metal Pt limit its large-scale application. Therefore, the development of low-cost electrocatalysts as an alternative to Pt-based HER catalysts is attractive.…”

“…Hydrogen energy is considered to be one of the clean energies with the most development potential in the 21 st century and electrolysis of water is one of the most important pathways to produce hydrogen [1,2] . However, the electrocatalytic hydrogen evolution reaction (HER) of electrolyzed water is slow in kinetics, which requires efficient electrocatalysts to reduce overpotentials, promote reaction kinetics, and improve electrical energy efficiency [3–5] . Pt‐based catalysts usually show excellent catalytic performance for HER, [6,7] but the low reserves and high cost of precious metal Pt limit its large‐scale application.…”