Vertically-Aligned Carbon Nanotube Arrays as Binder-Free Supports for Nickel Cobaltite based Faradaic Supercapacitor Electrodes

Oguntoye, Moses; Oak, Shreyas; Pashazanusi, Leila; Pratt, Lawrence R.; Pesika, Noshir S.

doi:10.1016/j.electacta.2017.03.172

Cited by 15 publications

(11 citation statements)

References 43 publications

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“…The changes of bending angle ( θ i ) as a function of radiation time during shape recovery was recorded. Shape recovery ratio ( R r ) of the specimen was calculated by:

R_{t} = \frac{180^{°} - θ_{i}}{180^{°}} \times 100 %

…”

Section: Methodsmentioning

confidence: 99%

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Carbon nanotubes array reinforced shape‐memory epoxy with fast responses to low‐power microwaves

Chen

Xiao-pei

et al. 2019

J of Applied Polymer Sci

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In this study, epoxy shape-memory polymer (ESMP) was infiltrated into the scaffolds of vertically aligned carbon nanotubes (CNTs) array grown by chemical vapor deposition (CVD). In the fabricated CNTs array/ESMP nanocomposite, the CNTs interconnected with each other and a three-dimensional (3D) network of the CNTs was formed. As a result, both thermal conductivity and electrical conductivity of the CNTs array/ESMP nanocomposite were higher than the random CNTs/ESMP composite fabricated by conventional high-speed mechanical stirring. In the random CNTs/ESMP composite, the CNTs aggregated seriously in the matrix. Along the CNTs axis, The CNTs array/ESMP nanocomposite showed a higher modulus and hardness than the random CNTs/ESMP composite, as revealed by nanoindentation tests. Under microwave radiation, the temperature of the CNTs array/ESMP nanocomposite increased more rapidly than pristine ESMP and the random CNTs/ESMP composite. Consequently, the CNTs array/ESMP nanocomposite showed a faster shape recovery speed compared with pristine ESMP and the random CNTs/ESMP composite in their microwavetriggered shape memory behaviors. Especially, the CNTs array/ESMP nanocomposite can recover the deformation fully in response to as low as 60 W microwaves. The presented CNTs array/ESMP nanocomposite with improved mechanical property and fast responses to low-power microwaves may find potential applications in smart devices.

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“…The changes of bending angle ( θ i ) as a function of radiation time during shape recovery was recorded. Shape recovery ratio ( R r ) of the specimen was calculated by:

R_{t} = \frac{180^{°} - θ_{i}}{180^{°}} \times 100 %

…”

Section: Methodsmentioning

confidence: 99%

“…CNTs can be patterned into vertically aligned arrays on growth substrates by engineered chemical vapor deposition (CVD) . When CNTs array is embedded into polymer matrix by suitable methods, the resin infiltrates into the spaces among CNTs, thus avoiding the CNTs aggregations.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes array reinforced shape‐memory epoxy with fast responses to low‐power microwaves

Chen

Xiao-pei

et al. 2019

J of Applied Polymer Sci

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“…For instance, battery with an active binder in the electrodes normally suffers from nonuniform porosity, inhomogeneity, tortuous electrolyte diffusion paths, and high electrical and thermal resistance caused by the point contacts between individual particles . Thus, the attribute of the high specific surface area and electrical conductivity of CNTs makes them good candidates for battery and supercapacitor electrodes . Commonly, CNTs is used as electrodes for lithium‐ion battery, lithium–sulfur battery, pseudocapacitors, and electrical double layer capacitor .…”

Section: Properties and Applications Of Aligned Cntsmentioning

confidence: 99%

“…Thus, the attribute of the high specific surface area and electrical conductivity of CNTs makes them good candidates for battery and supercapacitor electrodes . Commonly, CNTs is used as electrodes for lithium‐ion battery, lithium–sulfur battery, pseudocapacitors, and electrical double layer capacitor . As electrodes of energy storage device, aligned CNTs electrodes are much preferred over entangled CNTs electrodes because of their higher specific capacitance, lower equivalent series resistance, and better rate capability than the entangled CNTs electrodes.…”

Section: Properties and Applications Of Aligned Cntsmentioning

confidence: 99%

“…This is because aligned CNTs electrodes possess larger pore size, more regular pore structure and conducting pathway . The VA‐CNTs electrode can be directly grown on Inconel disk or metal foil[154a] and, in certain cases, can be further processed into free‐standing thin film, fiber, and yarn ( Figure A) for wearable and stretchable devices . For pure CNT electrodes, the performance of the supercapacitor can be improved by the densification process using liquid drops .…”

Section: Properties and Applications Of Aligned Cntsmentioning

confidence: 99%

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Directed and On‐Demand Alignment of Carbon Nanotube: A Review toward 3D Printing of Electronics

Goh

Agarwala

Yeong

2019

Adv Materials Inter

126

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Carbon nanotubes (CNTs) are 1D nanostructured materials with unique mechanical, optical, and electrical properties which can be potentially exploited for fabricating wide variety of devices. In addition, the biocompatibility of CNTs makes it attractive for wearable and implantable technology applications. Well‐aligned CNT structures show enhanced properties such as superior electron mobility, strain sensitivity, better mechanical property, and enhanced performance and reproducibility that are absent in their disordered counterparts, thus allowing more promising applications in various fields. With aligned CNTs, devices can be optimized to exhibit better performance with lesser materials and more miniature designs. This review summarizes the landscape of CNTs alignment, either during the growth or post‐growth processing. This paper delineates various CNTs alignment mechanism, process parameters, and challenges of each technique. A comparative discussion on the advantages, disadvantages, and degree of alignment of each technique is presented. A detailed discussion on the various applications that utilize properties of aligned CNTs devices is presented. The advent of 3D printing techniques for printing CNTs for novel and futuristic applications is also discussed.

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Formation of Mixed‐Metal Ceria Nanopeapod Composites within Scrolled Hexaniobate Nanosheets

et al. 2019

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Ceria hexaniobate nanopeapods have been prepared and their formation and assembly studied. Various sized ceria nanocubes (5 to 40 nm) were synthesized via a solvothermal approach with oleic acid and oleylamine capping agents. Utilizing a second solvothermal treatment, the nanoparticles were then captured within scrolling hexaniobate nanosheets to produce ceria@hexaniobate nanopeapods. In some instances, peapods were partially filled with ceria so that in a subsequent step, open sites could be filled with Au nanoparticles via in situ growth methods leading to arrangements of gold and ceria NPs within nanoscrolls. Studies on nanoparticle assembly and encapsulation were also carried out. Size‐selective preassembly of nanoparticles on hexaniobate nanosheet surfaces is observed prior to scrolling, after which smaller ceria NPs (ca. ≤ 10 nm) are efficiently captured inside scrolled nanosheets. Improved understanding and control of this behavior is important for further development of more intricate multicomponent particles assemblies and formations within varieties of tubular structures with different morphological and structural features.

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Vertically-Aligned Carbon Nanotube Arrays as Binder-Free Supports for Nickel Cobaltite based Faradaic Supercapacitor Electrodes

Cited by 15 publications

References 43 publications

Carbon nanotubes array reinforced shape‐memory epoxy with fast responses to low‐power microwaves

Carbon nanotubes array reinforced shape‐memory epoxy with fast responses to low‐power microwaves

Directed and On‐Demand Alignment of Carbon Nanotube: A Review toward 3D Printing of Electronics

Formation of Mixed‐Metal Ceria Nanopeapod Composites within Scrolled Hexaniobate Nanosheets

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