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Reversible and Irreversible Cation Intercalation in NiFeO(x) Oxygen Evolution Catalysts in Alkaline Media
[Image: see text] For electrocatalysts with a layered structure, ion intercalation is a common phenomenon. Gaining reliable information about the intercalation of ions from the electrolyte is indispensable for a better understanding of the catalytic performance of these electrocatalysts. Here, we ta...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9870210/ https://www.ncbi.nlm.nih.gov/pubmed/36629512 http://dx.doi.org/10.1021/acs.jpclett.2c03336 |
Sumario: | [Image: see text] For electrocatalysts with a layered structure, ion intercalation is a common phenomenon. Gaining reliable information about the intercalation of ions from the electrolyte is indispensable for a better understanding of the catalytic performance of these electrocatalysts. Here, we take a holistic approach for following intercalation processes by studying the dynamics of the catalyst, water molecules, and ions during intercalation using operando soft X-ray absorption spectroscopy (XAS). Sodium and oxygen K-edge and nickel L-edge spectra were used to investigate the Na(+) intercalation in a Ni(0.8)Fe(0.2)O(x) electrocatalyst during the oxygen evolution reaction (OER) in NaOH (0.1 M). The Na K-edge spectra show an irreversible intensity increase upon initial potential cycling and a reversible intensity increase at the intercalation potential, 1.45 V(RHE), coinciding with an increase in the Ni oxidation state. Simultaneously, the O K-edge spectra show that the Na(+) intercalation does not significantly impact the hydration of the catalyst. |
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