Assessing the Transformations of Supported Nanocatalysts Used in the Oxygen Evolution Reaction: A Case Study Using NiFe2O4 Nanoparticles Supported on Textured Ni Electrodes

Nanomaterials composed of nickel-iron oxyhydroxides (NiFeO x H y ) are used broadly as oxygen evolution reaction (OER) catalysts in electrolysis systems. These materials undergo complex phase transformations and electrochemical aging that are concurrent with the production of molecular oxygen. It is, therefore, of interest to understand the evolution and migration of the key active species at the interface between the nanocatalyst and the …