Journal ArticleDOI
Raman microspectroscopy of some iron oxides and oxyhydroxides
TLDR
In this paper, the laser power dependence of the spectra of oxides and oxyhydroxides was investigated by using Raman microscopy, and it was shown that increasing laser power causes the characteristic bands of hematite to show up in the spectrum of most of the compounds studied.Abstract:
Hematite (α-Fe2O3), magnetite (Fe3O4), wustite (FeO), maghemite (γ-Fe2O3), goethite (α-FeOOH), lepidocrocite (γ-FeOOH) and δ-FeOOH were studied by Raman microscopy. Such compounds have already been studied by Raman spectroscopy, but there are some disagreements in the reported data. Here, Raman microscopy was employed to investigate the laser power dependence of the spectra of these oxides and oxyhydroxides. Low laser power was used for the reference spectra in order to minimize the risks of spectral changes due to sample degradation. The results obtained show that increasing laser power causes the characteristic bands of hematite to show up in the spectra of most of the compounds studied whereas the hematite spectrum undergoes band broadening and band shifts. © 1997 John Wiley & Sons, Ltd.read more
Citations
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Journal ArticleDOI
Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process.
TL;DR: High-temperature (300 degrees C) aging of iron-oleic acid metal complex, which was prepared by the thermal decomposition of iron pentacarbonyl in the presence of oleic acid at 100 degrees C, was found to generate monodisperse iron nanoparticles.
Journal ArticleDOI
Graphene-Wrapped Fe(3)O(4) Anode Material with Improved Reversible Capacity and Cyclic Stability for Lithium Ion Batteries
Guangmin Zhou,Dawei Wang,Feng Li,Lili Zhang,Na Li,Zhong-Shuai Wu,Lei Wen,Gao Qing Lu,Hui-Ming Cheng +8 more
TL;DR: Li et al. as discussed by the authors proposed a method for Chinese Academia, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd., Shenyang 110016, Peoples R China.
Journal ArticleDOI
Oxygen-Deficient Hematite Nanorods as High-Performance and Novel Negative Electrodes for Flexible Asymmetric Supercapacitors
Xihong Lu,Yinxiang Zeng,Minghao Yu,Teng Zhai,Chaolun Liang,Shilei Xie,Muhammad-Sadeeq Balogun,Yexiang Tong +7 more
TL;DR: The asymmetric-supercapacitor device based on the oxygen-deficient α-Fe2 O3 nanorod negative electrode and a MnO2 positive electrode achieves a maximum energy density of 0.41 mW·h/cm(3) and is capable of charging a mobile phone and powering a light-emitting diode indicator.
Journal ArticleDOI
Effects of Fe Electrolyte Impurities on Ni(OH)2/NiOOH Structure and Oxygen Evolution Activity
Shannon Klaus,Shannon Klaus,Yun Cai,Yun Cai,Mary W. Louie,Mary W. Louie,Lena Trotochaud,Lena Trotochaud,Alexis T. Bell,Alexis T. Bell +9 more
TL;DR: In this article, the effects of Fe incorporation on structure-activity relationships in Ni(oxy)hydroxide were investigated using electrochemical, in situ Raman, X-ray photoelectron spectroscopy, and electrochemical quartz crystal microbalance measurements.
Journal ArticleDOI
The renaissance of iron-based Fischer-Tropsch synthesis: on the multifaceted catalyst deactivation behaviour.
Emiel de Smit,Bert M. Weckhuysen +1 more
TL;DR: This critical review will summarize the current state of knowledge of the underlying mechanisms for the activation and eventual deactivation of iron-based Fischer-Tropsch catalysts and suggest systematic approaches for relating chemical identity to performance in next generation iron- based catalyst systems.
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