Amorphous iron oxyhydroxide nanosheets: Synthesis, Li storage, and conversion reaction kinetics

Chen Xu; Yi Zeng; Xianhong Rui; Jixin Zhu; Huiteng Tan; Antonio Guerrero; Juan Toribio; Juan Bisquert; Germà Garcia-Belmonte; Qingyu Yan

doi:10.1021/jp405848j

Amorphous iron oxyhydroxide nanosheets: Synthesis, Li storage, and conversion reaction kinetics

Chen Xu, Yi Zeng, Xianhong Rui, Jixin Zhu, Huiteng Tan, Antonio Guerrero, Juan Toribio, Juan Bisquert, Germà Garcia-Belmonte^*, Qingyu Yan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	17462-17469
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	117
Issue number	34
DOIs	https://doi.org/10.1021/jp405848j
Publication status	Published - Aug 29 2013
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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Cite this

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title = "Amorphous iron oxyhydroxide nanosheets: Synthesis, Li storage, and conversion reaction kinetics",

abstract = "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.",

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T1 - Amorphous iron oxyhydroxide nanosheets

T2 - Synthesis, Li storage, and conversion reaction kinetics

AU - Xu, Chen

AU - Zeng, Yi

AU - Rui, Xianhong

AU - Zhu, Jixin

AU - Tan, Huiteng

AU - Guerrero, Antonio

AU - Toribio, Juan

AU - Bisquert, Juan

AU - Garcia-Belmonte, Germà

AU - Yan, Qingyu

PY - 2013/8/29

Y1 - 2013/8/29

N2 - 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.

AB - 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.

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Amorphous iron oxyhydroxide nanosheets: Synthesis, Li storage, and conversion reaction kinetics

Abstract

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