Preparation and phase transition of FeOOH nanorods: strain effects on catalytic water oxidation. Issue 14 (22nd March 2017)

• Record Type: Journal Article
• Authors: Park, Gisang; Kim, Yong-Il; Kim, Young Heon; Park, Mira; Jang, Kyu Yeon; Song, Hyunjoon; Nam, Ki Min
• Is Part Of: Nanoscale. Volume 9:Issue 14(2017)
• Page Start: 4751
• Page End: 4758
• Publication Date: 2017-03-22
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c6nr09790a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The electrochemical properties of strained-FeOOH nanorods are investigated based on the crystal phases to elucidate their relative catalytic activities. 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 Fe2 O3 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.