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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 Aug 22;55(35) :10381-5
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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.
1521-3773 Thenuwara, Akila C Cerkez, Elizabeth B Shumlas, Samantha L Attanayake, Nuwan H McKendry, Ian G Frazer, Laszlo Borguet, Eric Kang, Qing Remsing, Richard C Klein, Michael L Zdilla, Michael J Strongin, Daniel R P30 GM110758/GM/NIGMS NIH HHS/United States Journal Article Research Support, N.I.H., Extramural Research Support, U.S. Gov't, Non-P.H.S. Germany Angew Chem Int Ed Engl. 2016 Aug 22;55(35):10381-5. doi: 10.1002/anie.201601935. Epub 2016 May 6.