Nickel Confined in the Interlayer Region of Birnessite: an Active Electrocatalyst for Water Oxidation.
Angew Chem Int Ed Engl
; 55(35): 10381-5, 2016 08 22.
Article
em En
| MEDLINE
| ID: mdl-27151204
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 400â
mV for OER at an anodic current of 10â
mA cm(-2) . This η is significantly lower than the η values for birnessite (η≈700â
mV) and the active OER catalyst ß-Ni(OH)2 (η≈550â
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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MEDLINE
Assunto principal:
Oxigênio
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Água
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Técnicas Eletroquímicas
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Níquel
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article