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

Authors :
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.
Source :
Angewandte Chemie. 8/22/2016, Vol. 128 Issue 35, p10537-10541. 5p.
Publication Year :
2016

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00448249
Volume :
128
Issue :
35
Database :
Academic Search Index
Journal :
Angewandte Chemie
Publication Type :
Academic Journal
Accession number :
117484637
Full Text :
https://doi.org/10.1002/ange.201601935