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Thenuwara AC, Cerkez EB, Shumlas SL, Attanayake NH, McKendry IG, Frazer L, Borguet E, Kang Q, Remsing RC, Klein ML, Zdilla MJ, Strongin DR
Nickel Confined in the Interlayer Region of Birnessite: an Active Electrocatalyst for Water Oxidation
Angew Chem Int Ed Engl (2016) 55:10381-5.
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 (eta) of 400 mV for OER at an anodic current of 10 mA cm(-2) . This eta is significantly lower than the eta values for birnessite (eta approximately 700 mV) and the active OER catalyst beta-Ni(OH)2 (eta approximately 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.
Publication Date: 2016-08-22.
Last updated on Thursday, April 02, 2020