Nickel Nanoplates Enclosed by (111) Facets as Durable Oxygen Evolution Catalysts in Anion Exchange Membrane Water Electrolyzers

Abstract

The long‐term stability of Ni‐based catalysts, employed in the anode of anion exchange membrane water electrolyzers (AEMWE), has been a persisting concern. In this work, through a simple and powerful electrochemical anodization process, vertically aligned β‐NiOOH atomic sheets (vertical‐β‐NiOOH) grown on Fe‐doped Ni nanoplates (FeNi nanoplates) as a solution are offered. This innovative electrocatalyst demonstrates sustained stability of constant current density for over 120 d during the oxygen evolution reaction.The zero‐gap AEMWE cell harnessing the anodized FeNi nanoplates achieves a remarkable current density of 2.26 A cm−2 at 1.80 V with an energetic efficiency of 85.1%. It is anticipated that the electrochemically produced highly active, stable Ni‐based nanostructures demonstrate the potential in pushing the boundaries of AEMWE technology.

Construction of Ultrathin CuAuAg Nanosheet-Assembled Three-Dimensional Nanoflowers for Photothermal Conversion and Electrocatalytic Hydrogen Evolution

“…Furthermore, the in-plane pores and cavities promote multiple reflections of incident light, thereby boosting energy utilization efficiency . In terms of HER, the in-plane porous nanosheets assembled into a nanoflower architecture are characterized by nanoscale porosity and two-dimensional nanosheets. − These features contribute to an ultrahigh specific surface area, which increases the ratio of exposed atoms and enhances the diffusion and transmission of intermediates during the reaction, thereby benefiting the catalytic process …”