Nickel Confined in the Interlayer Region of Birnessite: an Active Electrocatalyst for Water Oxidation

Akila C. Thenuwara, Elizabeth B. Cerkez, Samantha L. Shumlas, Nuwan H. Attanayake, Ian G. McKendry, Laszlo Frazer, Eric Borguet, Qing Kang, Richard C. Remsing, Michael L. Klein, Michael J. Zdilla, Daniel R. Strongin

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Abstract

We report a synthetic method to enhance the electrocatalytic activity of birnessite for the oxygen evolution reaction (OER) by intercalating Ni2+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.

Original languageEnglish
Pages (from-to)10381-10385
Number of pages5
JournalAngewandte Chemie - International Edition
Volume55
Issue number35
DOIs
Publication statusPublished - 2016
Externally publishedYes

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