Peer-reviewed veterinary case report
Enhanced Activity in Layered Metal-Oxide-Based Oxygen Evolution Catalysts by Layer-by-Layer Modulation of Metal-Ion Identity.
- Year:
- 2025
- Authors:
- Ding R et al.
- Affiliation:
- Department of Chemistry · United States
Abstract
Few-layered potassium nickel and cobalt oxides show drastic differences in catalytic activity based on metal ion preorganization. Uniform compositions [(CoO<sub>2</sub>/K)<sub>6</sub> or (NiO<sub>2</sub>/K)<sub>6</sub>] show limited activity, while homogeneously mixed-metal cobalt/nickel oxides [(Co <sub><i>n</i></sub> Ni<sub>(1-<i>n</i>)</sub>O<sub>2</sub>/K)<sub>6</sub>] display moderate improvement. However, a layer-by-layer arrangement of alternating cobalt and nickel oxide sheets [e.g., (CoO<sub>2</sub>/K/NiO<sub>2</sub>/K)] provides superior catalytic performance, reducing the oxygen evolution overpotential by ∼200-400 mV. Density functional theory simulations provide an illustration of the electronic properties (density of states and localization of orbitals) that promote catalysis in the layer-segregated materials over those of homogeneous composition. This study reveals that atomic preorganization of metal ions within layered catalysts plays a more crucial role than the overall metal composition in enhancing catalytic efficiency for oxygen evolution.
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Search related cases →Original publication: https://europepmc.org/article/MED/41378168