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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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Publication details

The article was received on 05 Feb 2016, accepted on 17 Mar 2016 and first published on 17 Mar 2016


Article type: Paper
DOI: 10.1039/C6EE00377J
Citation: Energy Environ. Sci., 2016,9, 1734-1743
  • Open access: Creative Commons BY-NC license
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    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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