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Issue 14, 2017
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Preparation and phase transition of FeOOH nanorods: strain effects on catalytic water oxidation

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Abstract

The evolution of the phase and morphology of FeOOH nanorods prepared by a hydrothermal method is studied via X-ray diffraction (XRD) and in situ transmission electron microscopy. The FeOOH nanorod with a tetragonal structure (β-FeOOH) is gradually converted into a rhombohedral Fe2O3 nanorod by a simple thermal treatment. The existence of an intermediate FeOOH structure with high lattice strains during the phase transition is identified by Rietveld analysis using XRD. The electrochemical properties of the nanorods are investigated based on the crystal phases to elucidate their relative catalytic activities. The strained-FeOOH nanorods exhibited enhanced catalytic water oxidation activity and stability. Typically, the strained-FeOOH nanorods showed high electrochemical stability under neutral conditions, while tetragonal FeOOH nanorods under the same conditions showed rapid deactivation for water oxidation reaction.

Graphical abstract: Preparation and phase transition of FeOOH nanorods: strain effects on catalytic water oxidation

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Publication details

The article was received on 20 Dec 2016, accepted on 07 Mar 2017 and first published on 10 Mar 2017


Article type: Paper
DOI: 10.1039/C6NR09790A
Citation: Nanoscale, 2017,9, 4751-4758
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    Preparation and phase transition of FeOOH nanorods: strain effects on catalytic water oxidation

    G. Park, Y. Kim, Y. H. Kim, M. Park, K. Y. Jang, H. Song and K. M. Nam, Nanoscale, 2017, 9, 4751
    DOI: 10.1039/C6NR09790A

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