Three dimensional few layer graphene and carbon nanotube foam architectures for high fidelity supercapacitors

Wang, Wei; Guo, Shirui; Penchev, Miroslav; Ruiz, Isaac; Bozhilov, Krassimir N.; Yan, Dong; Ozkan, Mihrimah; Ozkan, Cengiz S.

doi:10.1016/j.nanoen.2012.10.001

Cited by 259 publications

(168 citation statements)

References 49 publications

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“…In addition, CNT/graphene hybrid architectures, which show excellent connections between CNTs and graphene, have also been achieved by CVD [258][259][260][261][262][263]. The hybrid structures exhibit excellent conductivity, high specific surface area and high stability.…”

Section: Fabrication Of Graphene and Hybrid Monolithsmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

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Flexible and wearable sensors have drawn extensive concern due to their wide potential applications in wearable electronics and intelligent robots. Flexible sensors with high sensitivity, good flexibility, and excellent stability are highly desirable for monitoring human biomedical signals, movements and the environment. The active materials and the device structures are the keys to achieve high performance. Carbon nanomaterials, including carbon nanotubes (CNTs), graphene, carbon black and carbon nanofibers, are one of the most commonly used active materials for the fabrication of high-performance flexible sensors due to their superior properties. Especially, CNTs and graphene can be assembled into various multi-scaled macroscopic structures, including one dimensional fibers, two dimensional films and three dimensional architectures, endowing the facile design of flexible sensors for wide practical applications. In addition, the hybrid structured carbon materials derived from natural bio-materials also showed a bright prospect for applications in flexible sensors. This review provides a comprehensive presentation of flexible and wearable sensors based on the above various carbon materials. Following a brief introduction of flexible sensors and carbon materials, the fundamentals of typical flexible sensors, such as strain sensors, pressure sensors, temperature sensors and humidity sensors, are presented. Then, the latest progress of flexible sensors based on carbon materials, including the fabrication processes, performance and applications, are summarized. Finally, the remaining major challenges of carbon-based flexible electronics are discussed and the future research directions are proposed. [56,57], have been used as the active components for the fabrication of flexible sensors. Among these materials, metal NPs can be used to fabricate flexible sensors with high sensitivity, but the sensing range and stretchability of these sensors are limited [58]. Besides, due to the limited chemical stability and reproducibility of metal nanowires, it is challenging to fabricate stable sensors using metal nanowires [10]. Similarly, conductive polymers with poor stability and conductivity are also difficult to be used for the fabrication of high-performance sensors [59]. In contrast, carbon materials are one of the most commonly investigated materials, especially CNTs and graphene (including graphene oxide (GO) and reduced graphene oxide (rGO)), due to their remarkable mechanical, electrical and thermal properties. To implement macroscopic applications, CNTs and graphene with superior properties in microscopic level should be converted into macroscopic functional assemblies, such as one dimensional (1D) fibers or yarns [60,61], two dimensional (2D) films or sheets [62,63], three dimensional (3D) architectures [64][65][66] (Fig. 1). The multi-scaled macroscopic carbon nanomaterials endow the flexible sensors with high sensitivity, excellent flexibility and good stability as well as desired configurations. Also, lo...

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Section: Fabrication Of Graphene and Hybrid Monolithsmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

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“…where, ∫Idv is the integrated area of the cyclic voltammograms, m is the mass of a single electrode, ∆V is the potential window and s is the scan rate (Wang et al, 2013).…”

Section: Cyclic Voltammetry Techniquementioning

confidence: 99%

“…Supercapacitors possess higher capacitance than those achievable with conventional capacitors and can operate at substantially higher specific power than batteries . These have various consumer and industrial applications such as cellular communication devices, memory protection of computer electronics, hybrid automobiles and uninterruptible power supplies (Wang et al, 2013;Jayathilake et al, 2014a).…”

Section: Introductionmentioning

confidence: 99%

Fabrication and evaluation of an all solid redox capacitor with an iodine based gel polymer electrolyte

Bandaranayake

Weerasinghe

Perera

et al. 2017

J. Natn. Sci. Foundation Sri Lanka

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Gel polymer electrolytes (GPEs) have demonstrated a greater potential to be used as electrolytes for various applications such as batteries, super capacitors, electrochromic devices and dye sensitised solar cells. They consist of a salt and a mixture of solvents trapped in a polymer matrix. In this study, optimisation and characterisation of a GPE consisting of polyvinylidene fluoride, ethylene carbonate, propylene carbonate and sodium iodide and its application in a redox capacitor with two polypyrrole electrodes was studied. GPE shows a conductivity of 9.69 × 10 -3 Scm -1 at room temperature (28 °C) with good mechanical stability. The corresponding composition is 1.13 PVdF : 2.5 EC : 2.5 PC : 0.4 NaI (by weight). The variation of conductivity with temperature follows Arhenius behaviour suggesting that the conductivity mechanism takes place via hopping of ions. Conductivity is purely ionic in nature. Properties of the redox capacitors were studied by the cyclic voltammetry (CV) technique, electrochemical impedance spectroscopy (EIS) technique and galvanostatic charge-discharge (GCD) test. The CV results showed the dependency of specific capacitance on the scan rate. The EIS results showed that capacitive behaviour becomes dominant only at low frequency range. The resulting specific capacitance was 3.19 Fg -1 . It was found that the redox capacitor exhibits an average discharge specific capacitance of 5.93 Fg

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“…For instance, 3D interpenetrating graphene electrodes, which allow the access of electrolyte ions to the internal surface of the graphene film thus lowering internal contact resistance compared to CNT network, have been fabricated by electrochemical reduction of GO for ultrahigh rate SCs [132][133][134]. Li et al [135] fabricated rGO-based SSCs with 3D interdigital electrodes and solid electrolyte multilayers via pressure spray printing and machine coating to achieve high and adjustable volumetric capacitance (77.9 F cm −3 with the 5 µm rGO layer), excellent flexibility, and stretchability.…”

Section: Graphene-based Stretchable Supercapacitorsmentioning

confidence: 99%

Recent advances and challenges of stretchable supercapacitors based on carbon materials

Zhang

Lin

et al. 2016

Sci. China Mater.

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Stretchable energy storage devices are essential for the development of stretchable electronics that can maintain their electronic performance while sustain large mechanical strain. In this context, stretchable supercapacitors (SSCs) are regarded as one of the most promising power supply in stretchable electronic devices due to their high power densities, fast charge-discharge capability, and modest energy densities. Carbon materials, including carbon nanotubes, graphene, and mesoporous carbon, hold promise as electrode materials for SSCs for their large surface area, excellent electrical, mechanical, and electrochemical properties. Much effort has been devoted to developing stretchable, carbon-based SSCs with different structure/performance characteristics, including conventional planar/textile, wearable fiber-shaped, transparent, and solid-state devices with aesthetic appeal. This review summarizes recent advances towards the development of carbon-based SSCs. Challenges and important directions in this emerging field are also discussed.

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Three dimensional few layer graphene and carbon nanotube foam architectures for high fidelity supercapacitors

Cited by 259 publications

References 49 publications

Advanced carbon materials for flexible and wearable sensors

Advanced carbon materials for flexible and wearable sensors

Fabrication and evaluation of an all solid redox capacitor with an iodine based gel polymer electrolyte

Recent advances and challenges of stretchable supercapacitors based on carbon materials

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