Electrically conductive oxide aerogels: new materials in electrochemistry

Rolison, Debra R.; Dunn, Bruce

doi:10.1039/b007591o

Cited by 355 publications

(312 citation statements)

References 163 publications

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“…The vanadium oxide xerogel, V 2 O 5 Á nH 2 O has a ribbon-like structure, providing more access for Li þ ion insertion than its crystalline counterpart, leading to a more versatile host for Li þ ion intercalation and exhibiting improved capacity for the lithium 14 . The basic units of the V 2 O 5 xerogel are sheets comprised of two vanadium oxide layers 1 .…”

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Graphene-modified nanostructured vanadium pentoxide hybrids with extraordinary electrochemical performance for Li-ion batteries

et al. 2015

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The long-standing issues of low intrinsic electronic conductivity, slow lithium-ion diffusion and irreversible phase transitions on deep discharge prevent the high specific capacity/energy (443 mAh g À 1 and 1,550 Wh kg À 1 ) vanadium pentoxide from being used as the cathode material in practical battery applications. Here we develop a method to incorporate graphene sheets into vanadium pentoxide nanoribbons via the sol-gel process. The resulting graphene-modified nanostructured vanadium pentoxide hybrids contain only 2 wt. % graphene, yet exhibits extraordinary electrochemical performance: a specific capacity of 438 mAh g À 1 , approaching the theoretical value (443 mAh g À 1 ), a long cyclability and significantly enhanced rate capability. Such performance is the result of the combined effects of the graphene on structural stability, electronic conduction, vanadium redox reaction and lithium-ion diffusion supported by various experimental studies. This method provides a new avenue to create nanostructured metal oxide/graphene materials for advanced battery applications.

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confidence: 99%

Graphene-modified nanostructured vanadium pentoxide hybrids with extraordinary electrochemical performance for Li-ion batteries

et al. 2015

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“…42 Electrochemical studies of electrically conductive oxide aerogels, where the feature size is on the order of 10 nm, helped demonstrate that insertion oxides on the nanoscale possess both battery-like and capacitor-like behavior. 35 Smyrl and coworkers used coulometric titration to demonstrate that V 2 O 5 aerogels exhibited two voltage-time ( V-t ) domains with capacitor-like behavior at short times ( V ∝ t ) for the portions of the insertion material in closest contact to the current collector, which then transitioned to diffusion-limited character ( V ∝ √ t ) at longer times. 43 It was then shown that abandoning the classic powdered composite electrode structure to formulate a monoparticulate layer of V 2 its current collector creates an electrode structure with explicit coupling of capacitive (EC) and faradaic (battery) behavior.…”

Section: Dual Function In One Nanostructured Electrode: Blended Battementioning

confidence: 99%

“…33 , 34 Note that when the stoichiometry reaches 4, 5, or 6 Li per V 2 O 5 , it is not clear that insertion (or intercalation) is the correct description of the Li-V 2 O 5 storage process. 35 The ability of V 2 O 5 aerogels to insert Mg 2+ , Al…”

Section: Use Of Deliberately Defective Nanoscale Materials To Enhancementioning

confidence: 99%

Electrochemical energy storage to power the 21st century

2011

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“…Three-dimensional (3D) nanostructured metal architectures typically exhibit large specific surface areas and high electrical conductivity; therefore, their application as electrodes in functional devices such as supercapacitors, 1 fuel cells 2 and batteries 3 have been widely researched. For these potential applications, the use of 3D copper nanostructured architectures [4][5][6][7][8] is most attractive.…”

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Fabrication of Three-Dimensional (3D) Copper/Carbon Nanotube Composite Film by One-Step Electrodeposition

Arai

Ozawa

Shimizu

2016

J. Electrochem. Soc.

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A three-dimensional (3D) composite film containing copper nanostructures and carbon nanotubes (3DC/CNT composite film) was fabricated by one-step electrodeposition. The 3DC/CNT composite film was formed under galvanostatic conditions using a copper sulfate bath containing CNTs and polyacrylic acid which acts as both a 3DC-forming and a CNT-dispersing agent. The composite film consists of thin copper sheets with thicknesses of ca. 70-80 nm and CNTs, with large interior spaces between sheets. The CNTs were homogeneously distributed inside the composite film and were fixed by the copper sheets where CNTs pierce the copper sheets. The CNT content in the composite films increased with the CNT concentration of the plating bath. The 3DC film without CNTs did not maintain its 3D spaces when the film thickness was increased due to insufficient structural strength, whereas the 3DC/CNT composite film maintained the 3D spaces despite an increase in film thickness, which suggests that the CNTs reinforce the film to maintain the 3D spaces. Three-dimensional (3D) nanostructured metal architectures typically exhibit large specific surface areas and high electrical conductivity; therefore, their application as electrodes in functional devices such as supercapacitors, 1 fuel cells 2 and batteries 3 have been widely researched. For these potential applications, the use of 3D copper nanostructured architectures 4-8 is most attractive. However, although 3D copper nanostructured architectures are very effective to improve electrode functions, their manufacture requires many steps and is therefore complex. Our group has previously developed a very straightforward method for the fabrication of 3D copper nanostructured architectures by electrodeposition, in which an organic additive is simply added to an electrodeposition bath.9 This process for the preparation of 3D copper nanostructured architecture films by onestep electrodeposition (the resulting products henceforth being designated as 3DC1 film) is expected to be used as a practical method for the fabrication of various components, such as current collectors for tin-based lithium-ion battery anodes.10 However, the 3DC1 film consists of very thin (30-50 nm) copper sheets; therefore, its structural strength is low, which results in deformation of the 3D structure when a slight physical force is applied.In contrast, carbon nanotubes (CNTs) 11,12 have excellent mechanical characteristics, 13-15 such as high tensile strength and high elastic modulus, in addition to high thermal [16][17][18] and electrical conductivity. 19,20 Research into CNT composites such as metal/CNT composites has thus been actively pursued.21,22 A 3D-copper nanostructured architecture containing CNTs (3DC/CNT composite) is thus considered to be an attractive copper-based 3D composite material that would have sufficient structural strength due to the reinforcement effect of the CNTs. If a 3DC/CNT composite could be fabricated by a simple method, then the 3DC/CNT composite materials would be expected to be used for ...

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Electrically conductive oxide aerogels: new materials in electrochemistry

Cited by 355 publications

References 163 publications

Graphene-modified nanostructured vanadium pentoxide hybrids with extraordinary electrochemical performance for Li-ion batteries

Graphene-modified nanostructured vanadium pentoxide hybrids with extraordinary electrochemical performance for Li-ion batteries

Electrochemical energy storage to power the 21st century

Fabrication of Three-Dimensional (3D) Copper/Carbon Nanotube Composite Film by One-Step Electrodeposition

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