Amorphous Iron Oxyhydroxide Nanosheets: Synthesis, Li Storage, and Conversion Reaction Kinetics

We present a facile approach to synthesize amorphous iron oxyhydroxide nanosheet from the surfactant-assisted oxidation of iron sulfide nanosheet. The amorphous iron oxyhydroxide nanosheet is porous and has a high surface area of 223 m2 g–1. The lithium storage properties of the amorphous iron oxyhy...

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Bibliographic Details
Published inJournal of physical chemistry. C Vol. 117; no. 34; pp. 17462 - 17469
Main Authors Xu, Chen, Zeng, Yi, Rui, Xianhong, Zhu, Jixin, Tan, Huiteng, Guerrero, Antonio, Toribio, Juan, Bisquert, Juan, Garcia-Belmonte, Germà, Yan, Qingyu
Format Journal Article
LanguageEnglish
Published Columbus, OH American Chemical Society 29.08.2013
Subjects
Applied sciences
Chemistry
Corrosion
Corrosion mechanisms
Cross-disciplinary physics: materials science; rheology
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
General and physical chemistry
Materials science
Metals. Metallurgy
Nanoscale materials and structures: fabrication and characterization
Other topics in nanoscale materials and structures
Physics
Porous materials; granular materials
Specific materials
Nanoplate
Nanosheet
Reaction kinetics
Iron
Oxidation
Electrode material
Surfactant
Surface area
Current density
Porous material
Hysteresis
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Summary:We present a facile approach to synthesize amorphous iron oxyhydroxide nanosheet from the surfactant-assisted oxidation of iron sulfide nanosheet. The amorphous iron oxyhydroxide nanosheet is porous and has a high surface area of 223 m2 g–1. The lithium storage properties of the amorphous iron oxyhydroxide are characterized: it is a conversion-reaction electrode material, and it demonstrates superior rate capabilities (e.g., discharge capacities as high as 642 mAh g–1 are delivered at a current density of 2 C). The impedance spectroscopy analysis identifies a RC series subcircuit originated by the conversion-reaction process. Investigation of the conversion-reaction kinetics through the RC subcircuit time constant reproduces the hysteresis in the discharge/charge voltage profile. Hysteresis is then connected to underlying thermodynamics of the conversion reaction rather than to a kinetic limitation.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp405848j