Nickel regulated hierarchical structure bimetallic phosphides on iron foam to promote ampere-level current density for oxygen evolution reaction

Abstract

Strategically designing advanced electrocatalysts to accelerate the inherently slow oxygen evolution reaction (OER) remains a crucial yet demanding endeavor in electrocatalysis research. Herein, we present the FeNiP nanorod with adjustable doping levels on FeNiOOH nanosheets fabricated onto iron foam. The as-prepared FeNiP/FeNiOOH-1 demonstrated outstanding OER performance, requiring only 436 mV overpotentials to reach an industrial-relevant current density of 1 A cm-2. The incorporation of Ni inhibits the formation of iron oxides, which was beneficial for the formation of highly active FeNiOOH, thereby increasing the number of active sites and enhancing OER activity. This research introduces a facile and scalable synthesis protocol for earth-abundant transition metal-based electrocatalysts through compositionally adjustable architectures, achieving OER performance in alkaline media. .