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

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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 (beta-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.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2017-04
Language
English
Article Type
Article
Keywords

OXYGEN EVOLUTION REACTION; SCANNING ELECTROCHEMICAL MICROSCOPY; ONE-POT SYNTHESIS; IRON OXYHYDROXIDE; EVOLVING CATALYST; OXIDE; ELECTROCATALYSTS; PHOSPHATE; TRANSFORMATION; AKAGANEITE

Citation

NANOSCALE, v.9, no.14, pp.4751 - 4758

ISSN
2040-3364
DOI
10.1039/c6nr09790a
URI
http://hdl.handle.net/10203/223692
Appears in Collection
CH-Journal Papers(저널논문)
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