Iron oxide nanotube film formed on carbon steel for photoelectrochemical water splitting: effect of annealing temperature

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Title:	Iron oxide nanotube film formed on carbon steel for photoelectrochemical water splitting: effect of annealing temperature
Authors:	林景崎;Deng, Hongda;Huang, Mao-Chia;Weng, Wei-Heng;Lin, Jing-Chie
Contributors:	工學院材料科學與工程研究所
Keywords:	Annealing;annealing effect;anodization;Anodizing;Arrays;Bundles;carbon steel;iron oxide nanotube;Iron oxides;Morphology;Nanostructure;Photoelectric effect;photoelectrochemical water splitting
Date:	2016-12-01
Issue Date:	2026-04-23 11:37:55 (UTC+8)
Publisher:	John Wiley and Sons Ltd;Bognor Regis: Blackwell Publishing Ltd
Abstract:	摘要： Carbon steels (CSs) were anodized in an ethylene glycol solution containing 3 vol.% H2O and 0.1 m NH4F to coat with nanotube arrays film. The as anodized nanotube arrays film were annealed in argon atmosphere at various temperatures ranging from 250 to 550 °C for 4 h. The morphology and crystal phases of the film developed after annealing processes were examined using field emission scanning electron microscopy, X‐ray diffraction. Morphology transforms from nanobube arrays to nanotube bundles at 250 °C, to nanobube bundles with nanoflakes at 350 and 450 °C, to nanotube bundles with nanobelts at 550 °C. Amorphous transformed completely into maghemite at 350 °C and hematite with minor magnetite at 450 and 550 °C. Diffuse reflectance ultraviolet and visible spectra revealed iron oxide nanotube film annealed at 350 °C, or higher than 350 °C behaved tremendous absorbance ability in visible spectra range. Mott–Schottky analysis and linear scan voltammetry were performed in 1 m NaOH to show that iron oxide nanotube film annealed at 450 °C exhibited best charge carrier transfer ability upon illumination and superior photoelectrochemical properties compared with the films annealed at other temperatures. The film annealed at 450 °C displayed the photocurrent density of 0.13 mA cm−2 at 0.2 VAg/AgCl, but the film annealed at other temperatures with the photocurrent densities of lower than 0.05 mA cm−2 at 0.2 VAg/AgCl. The morphology and phase transform of iron oxide nanotube film at different annealing temperature results in the change of their photoelectrochemical properties. Copyright © 2016 John Wiley & Sons, Ltd. 其他題名： Surf. Interface Anal 出版者： Bognor Regis: Blackwell Publishing Ltd 出版日期： 2016-12 出處： Surface and interface analysis, 2016-12, Vol.48 (12), p.1278-1284 版權： Copyright © 2016 John Wiley & Sons, Ltd. 識別號： ISSN: 0142-2421 識別號： EISSN: 1096-9918 識別號： DOI: 10.1002/sia.6032 識別號： CODEN: SIANDQ
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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