High-Density NiMnFe Hydroxide Nanoparticle-Nanosheet Arrays for Industrial-Level Electrochemical Oxygen Evolution Reaction

Graphical A Mn, Fe co-doped Ni(OH) x catalyst with high-density nanoparticle-nanosheet structure was prepared for industrial-level OER application. Mn and Fe can modulate the electronic structure of nickel hydroxide, and the high-density nanoparticle-nanosheet array structure can minimize the bubble adhesion effect. These features are conducive to improving OER activity. Oxygen evolution reaction (OER) plays key roles in the energy efficiency of electro-catalytic systems. However, the sluggish kinetics and accumulated gas slugs under the industrial operation condition limit the application of OER. Herein, Mn, Fe co-doped nickel hydroxide with highly dense nano-sheets array is obtained through a simple and mild two-step etching strategy, which exhibits a remarkable OER performance. Doping Mn and Fe can modulate the electronic structure and redox behavior of active site, leading to an excellent intrinsic activity toward OER. Moreover, highly dense nanoparticle-nanosheet array structure is conducive to provide more active sites and inhibit the accumulation of gas slugs under industrial current density. Thus, the obtained catalyst provides an impressing current density of 1.8 A cm −2 at a small overpotential of 370 mV and sustains the performance more than 100 h.