Porous Nis@Ni2p Nanoframe as a Muliti-Functional Catalyst for Enhanced Oxygen Evolution and Urea Oxidation Reactions

Abstract

During water electrolysis, multifunctional electrocatalysts with outstanding functionality and endurance must be thoughtfully constructed and designed. Below, we report a hollow NiS@Ni 2 P nanoframe heterostructure that works well as a substitute catalyst for the urea oxidation and general water splitting reactions. The hollow NiS@Ni 2 P nanoframe was synthesized by ion exchange, sulfurization and phosphating, which is favorable for achieving a heterostructure. The NiS@Ni 2 P catalyst exhibits excellent catalytic activity and strong long-term stability in 1.0 M KOH solutions for the hydrogen evolution reaction, which needs 121 mV to achieve 10 mA cm −2 , and the oxygen evolution reaction, which needs 275 mV to acquire 20 mA cm −2 . These advantages come from the optimal electronic structural configuration, hierarchical hollow nanoframe structure, and large surface area. It could attain 10 mA cm −2 at 1.41 V when utilized as a urea oxidation reaction anode, which is lower than the oxygen evolution reaction. For total water splitting and urea oxidation process, NiS@Ni 2 P as a bifunctional catalyst holds tremendous promise due to its strong electrocatalytic activity, ease of manufacture, and low cost of raw ingredients.

Keywords: Sulfurization, Phosphorization, Electrolysis, Oxygen evolution reaction, Urea oxidation reaction