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Nickel Confined in the Interlayer Region of Birnessite: an Active Electrocatalyst for Water Oxidation
Akila C Thenuwara1,2, Elizabeth B Cerkez1, Samantha L Shumlas1,2
1Department of Chemistry, Temple University, 1901 N. 13th Street, Philadelphia, PA, 19122, USA.
Abstract:
We report a synthetic method to enhance the electrocatalytic activity of birnessite for the oxygen evolution reaction (OER) by intercalating Ni(2+) ions into the interlayer region. Electrocatalytic studies showed that nickel (7.7 atomic %)-intercalated birnessite exhibits an overpotential (η) of 400 mV for OER at an anodic current of 10 mA cm(-2) . This η is significantly lower than the η values for birnessite (η≈700 mV) and the active OER catalyst β-Ni(OH)2 (η≈550 mV). Molecular dynamics simulations suggest that a competition among the interactions between the nickel cation, water, and birnessite promote redox chemistry in the spatially confined interlayer region.
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