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

Nanoscale amorphous materials are very important member of the non-crystalline solids family and have emerged as a new category of advanced materials. However, morphological control of amorphous nanomaterials is very difficult because of the atomic isotropy of their internal structures. In this review, we introduce some emerging innovative methods to fabricate well-defined, regular-shaped amorphous nanomaterials. We then highlight some examples to evaluate the use of these amorphous materials in electrodes, and their optical response. There is still plenty of room to explore the amorphous world. As researchers continue to advance the scientific tools that underpin the concepts related to "amorphous", additional applications of these materials will emerge. Their controlled synthesis will undoubtedly attain new heights in the discipline of nanomaterials, and allow nanoscale amorphous materials to become more sophisticated, diverse, and mainstream.

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“…However, few 2D amorphous nanomaterials have been reported [68,69], which might be because of their limited synthetic methodology.…”

Section: Nanosheetsmentioning

confidence: 99%

“…Xu et al [69] presented a facile approach to synthesize amorphous iron oxyhydroxide nanosheets by the surfactant-assisted oxidation of iron sulfide nanosheet. An SEM image (Fig.…”

Section: Nanosheetsmentioning

confidence: 99%

Tailoring the shape of amorphous nanomaterials: recent developments and applications

2015

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“…Recently, we have proposed a model to study the lithiation kinetic through equivalent circuit analysis of the experimentally obtained electrochemical impedance spectroscopy (EIS) spectra [12,13]. This approach facilitates the extraction of resistances involved in the overall lithium ion storage, as well as the insertion-extraction process occurring during the cycling of the battery.…”

Section: Introductionmentioning

confidence: 99%

Facile kinetics of Li-ion intake causes superior rate capability in multiwalled carbon nanotube@TiO2 nanocomposite battery anodes

Acevedo–Peña

Haro

Rincón

et al. 2014

Journal of Power Sources

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“…2a lead us to regard the alloying reaction itself as the origin for the additional resistance at low frequencies. The resistive process a R accompanying the chemical capacitance is seen then as a contribution to the alloying-related current hindrance [23].…”

Section: Impedance Responsesmentioning

confidence: 99%

Germanium coating boosts lithium uptake in Si nanotube battery anodes

Haro

Song

Guerrero

et al. 2014

Phys. Chem. Chem. Phys.

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Si nanotubes for reversible alloying reaction with lithium are able to accommodate large volume changes and offer improved cycle retention and reliable response when incorporated into battery anodes. However, Si nanotubes electrode exhibits poor rate capability because of its inherently low electron conductivity and Li ion diffusivity. Si/Ge double-layered nanotubes electrode show promise to improve structural stability and electrochemical kinetics, as compared to homogeneous Si nanotube arrays. The mechanism explaining the enhancement in the rate capabilities is here revealed by means of electrochemical impedance methods. Ge shell efficiently provides electrons to the active materials which increase the semiconductor conductivity thereby assisting Li + ion incorporation. The charge transfer resistance which accounts for the interfacial Li + ion intake from the electrolyte is reduced by two orders of magnitude, implying the key role of Ge layer as electron supplier. Other resistive processes hindering the electrode charge/discharge process are observed to show comparable values for Si and Si/Ge array electrodes.Keywords: Semiconductor nanostructures, Li-ion batteries, Electrochemical kinetics, Rate capability, Electrochemical impedance spectroscopy published in Phys. Chem. Chem. Phys. 2014, 16, 17930 2 Introduction Among various alloying-type anode materials for lithium ion batteries (LIB), Si has received considerable attention due to its highest theoretical capacity, 4200 mAh/g at the fully lithiated state Li 22 Si 5 , being the most promising alternative for carbon anodes [1,2]. Although the fast capacity fading of Si electrode (resulting from large volume change associated with lithium ion) has been considered as a main obstacle for its practical use, significant improvement in the cycle performance has been achieved by engineering the geometry and dimension of Si anode materials [3,4]. Especially, Si nanotubes (Si NT) array exhibited the robust cyclability due to the reversible morphological change [5][6][7]. Electrode materials for LIB should be designed to fulfill both energy density and power density requirements of critical applications such as large-scale storage for renewable power sources, electric vehicles, and plug-in hybrid electric vehicles. However, Si NT electrode could not meet the demand on the high power density due to its poor rate capability attributed to inherently low electron conductivity and ion diffusivity. To improve these two parameters researchers have investigated in the last years different strategies such as the growth of Si on nanopillar metallic structrures [8], fabrication of core-shell composites [9], or coating of Si electrode with a good electron and/or ion conductor (polymer, graphene, etc) [10][11][12][13][14]. Very recently, Si/Ge double-layered nanotubes (Si/Ge DLNT) array prepared by employing a template-assisted synthesis method based on chemical vapor deposition process has been reported [15]. With optimal designs, Si/Ge DLNT exhibited significant improve...

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

Cited by 29 publications

References 43 publications

Tailoring the shape of amorphous nanomaterials: recent developments and applications

Tailoring the shape of amorphous nanomaterials: recent developments and applications

Facile kinetics of Li-ion intake causes superior rate capability in multiwalled carbon nanotube@TiO2 nanocomposite battery anodes

Germanium coating boosts lithium uptake in Si nanotube battery anodes

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