Journal
NANOSCALE
Volume 9, Issue 14, Pages 4751-4758Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr09790a
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2015R1C1A1A02037373, NRF-2015R1A2A2A01004196]
- Civil & Military technology cooperation program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2014M3C1A9060863]
- R&D Convergence Program of NST (National Research Council of Science & Technology) of Republic of Korea
- National Research Foundation of Korea [2015R1A2A2A01004196, 2014M3C1A9060863] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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