Suppression of Catalyst Layer Detachment by Interfacial Microstructural Modulation of the NiCo₂O₄/Ni Oxygen Evolution Electrode for Renewable Energy-Powered Alkaline Water Electrolysis.

ABSTRACT: Alkaline water electrolysis (AWE) is a large-scale hydrogen production technology. A major degradation mode of AWE when using fluctuating power derived from renewable energies is the detachment of the catalyst layer (CL). Here, this study investigates the CL detachment mechanism of NiCo₂O₄-CL-coated Ni (NCO/Ni) electrodes under an accelerated durability test (ADT) simulating a fluctuating power and the effect of post-annealing on detachment behavior. Microstructural analysis reveals that detachment begins at the nanoscale gaps between the stacked CLs and between CL and the substrate. Post-annealing at 400 °C removes the degradation starting point in CL, and a composition gradient Co-doped NiO interlayer and NiO(111)/Ni(111) epitaxial interface form between CL and the

SUBMITTER: Todoroki N 

PROVIDER: S-EPMC10214372 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature