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Issue 5, 2016
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Effect of interlayer anions on [NiFe]-LDH nanosheet water oxidation activity

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Abstract

We synthesized nickel–iron layered double hydroxide ([NiFe]-LDH) nanosheets with different interlayer anions to probe their role in water oxidation catalysis. In alkaline electrolyte in ambient air, carbonate rapidly replaced other interlayer anions and catalytic activity was highest. Electrocatalytic water oxidation in virtually carbonate-free alkaline electrolyte revealed that activity was a function of anion basicity. Our [NiFe]-LDH nanosheets, prepared by pulsed laser ablation in liquids, were regenerated in carbonate-containing aqueous KOH. Anion binding motifs were assessed by X-ray photoelectron spectroscopy in combination with density functional theory calculations, suggesting that nitrite species bound to edge-site Fe in the precatalyst correlated with higher water oxidation activity.

Graphical abstract: Effect of interlayer anions on [NiFe]-LDH nanosheet water oxidation activity

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Supplementary files

Article information


Submitted
05 Feb 2016
Accepted
17 Mar 2016
First published
17 Mar 2016

This article is Open Access

Energy Environ. Sci., 2016,9, 1734-1743
Article type
Paper

Effect of interlayer anions on [NiFe]-LDH nanosheet water oxidation activity

B. M. Hunter, W. Hieringer, J. R. Winkler, H. B. Gray and A. M. Müller, Energy Environ. Sci., 2016, 9, 1734
DOI: 10.1039/C6EE00377J

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