Graphene-metal oxide nanocomposites for supercapacitors: A perspective review

Khedekar, Vardhaman V.; Zaeem, Shaikh Mohammed; Das, Santanu

doi:10.5185/amlett.2018.1932

Cited by 18 publications

(3 citation statements)

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“…GO has numerous potential applications due to its chemical composition and flake size tunability, including electronics, composites, renewable energy devices, biology, and medicine [22][23][24][25][26]. It is also being considered for electrode materials in batteries, double-layered capacitors, fuel cells, solar cells, and other energy conversion devices [27][28][29][30]. CB, another promising reinforcing material, was first used in 1904 as a filler in nanometer and spherical-form composites [31].…”

Section: Introductionmentioning

confidence: 99%

Effects of Nanofillers and Synergistic Action of Carbon Black/Nanoclay Hybrid Fillers in Chlorobutyl Rubber

Joseph,

Maria,

Thomas

et al. 2024

J. Compos. Sci.

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Nanocomposites based on chlorobutyl rubber (CIIR) have been made using a variety of nanofillers such as carbon black (CB), nanoclay (NC), graphene oxide (GO), and carbon black/nanoclay hybrid filler systems. The hybrid combinations of CB/nanoclay are being employed in the research to examine the additive impacts on the final characteristics of nanocomposites. Atomic force microscopy (AFM), together with resistivity values and mechanical property measurements, have been used to characterise the structural composition of CIIR-based nanocomposites. AFM results indicate that the addition of nanoclay into CIIR increased the surface roughness of the material, which made the material more adhesive. The study found a significant decrease in resistivity in CIIR–nanoclay-based composites and hybrid compositions with nanoclay and CB. The higher resistivity in CB composites, compared to CB/nanoclay, suggests that nanoclay enhances the conductive network of carbon black. However, GO-incorporated composites failed to create conductive networks, which this may have been due to the agglomeration. The study also found that the modulus values at 100%, 200%, and 300% elongation are the highest for clay and CB/clay systems. The findings show that nanocomposites, particularly clay and clay/CB hybrid nanocomposites, may produce polymer nanocomposites with high electrical conductivity. Mechanical properties correlated well with the reinforcement provided by nanoclay. Hybrid nanocomposites with clay/CB had increased mechanical properties because of their enhanced compatibility and higher filler–rubber interaction. Nano-dispersed clay helps prevent fracture growth and enhances mechanical properties even more so than CB.

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Section: Introductionmentioning

confidence: 99%

Effects of Nanofillers and Synergistic Action of Carbon Black/Nanoclay Hybrid Fillers in Chlorobutyl Rubber

Joseph,

Maria,

Thomas

et al. 2024

J. Compos. Sci.

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“…Based on the energy storage mechanism, supercapacitors are divided into two types, covering pseudocapacitors and electrical double-layer capacitors (EDLC) [6]. Materials used for the manufacture of supercapacitor electrodes include graphene [7], carbon nanotubes [8], carbon aerogel [9], porous carbon [10], and mineral composites-carbon [11]. Graphene is one of the interesting materials and has become a center of research in the last ten years because it has superior properties and wide potential in various fields such as nano-electronics, sensors, nanocomposites, batteries, supercapacitors, and transparent electrodes [12].…”

Section: Introductionmentioning

confidence: 99%

N-Doped rGO-Like Carbon Prepared from Coconut Shell: Structure and Specific Capacitance

Khambali¹,

Priyanto²,

Asih³

et al. 2023

Journal of Renewable Materials

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An rGO−like carbon compound has been synthesized from biomass, i.e., old coconut shell, by a carbonization process followed by heating at 400°C for 5 h. The nitrogen doping was achieved by adding the urea (CH 4 N 2 O) and stirring at 70°C for 14 h. The morphology and structure of the rGO-like carbon were investigated by electron microscopies and Raman spectroscopy. The presence of C-N functional groups was analyzed by Fourier transform infrared and synchrotron X-ray photoemission spectroscopy, while the particle and the specific capacitance were measured by particle sizer and cyclic voltammetry. The highest specific capacitance of 72.78 F/g is achieved by the sample with 20% urea, having the smallest particles size and the largest surface area. The corresponding sample has shown to be constituted by the appropriate amount of C-N pyrrolic and pyridinic defects.

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“…There are a wide variety of oxide semiconductors, including TiO 2 , MnO 2 , NiO, MoO 3 , Co 3 O 4 , etc. used as electrodes for supercapacitor applications [ 6 , 7 ]. It is known that TiO 2 is an excellent dielectric material with a faradaic charge storage behavior [ 8 , 9 ], is cost-effective, and is found in abundance, but when TiO 2 alone is used as a supercapacitor electrode, its behavior is relatively poor [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Multi-Functional Materials Based on Cu-Doped TiO2 Ceramic Fibers with Enhanced Pseudocapacitive Performances and Their Dielectric Characteristics

Pascariu¹,

Homocianu²,

Vacareanu³

et al. 2022

Polymers

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In this work, pure TiO2 and Cu (0.5, 1, 2%)-doped TiO2 composites prepared by electrospinning technique followed by calcination at 900 °C, and having high pseudocapacitive and dielectric characteristics were reported. These nanocomposites were characterized by scanning electron microscopy, X-ray diffraction, and dynamic water sorption vapor measurements. The structural characterization of these nanostructures highlighted good crystallinity including only the rutile phase. The electrochemical characteristics were investigated by cyclic voltammetry and galvanostatic charge–discharge measurements, which were performed in a KOH electrolyte solution. Among the Cu-doped TiO2 nanostructures that were prepared, the one containing 0.5% Cu exhibited superior electrochemical properties, including high specific gravimetric capacitance of 1183 F·g−1, specific capacitance of 664 F·g−1, energy density of 45.20 Wh·kg−1, high power density of 723.14 W·kg−1, and capacitance retention of about 94% after 100 cycles. The dielectric investigation shows good dielectric properties for all materials, where the dielectric constant and the dielectric loss decreased with the frequency increase. Thus, all the interconnected studies proved that these new materials show manifold ability and real applicative potential as pseudocapacitors and high-performance dielectrics. Future work and perspectives are anticipated for characterizing electrochemical and dielectric properties for materials including larger amounts of Cu dopant.

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Graphene-metal oxide nanocomposites for supercapacitors: A perspective review

Cited by 18 publications

References 0 publications

Effects of Nanofillers and Synergistic Action of Carbon Black/Nanoclay Hybrid Fillers in Chlorobutyl Rubber

Effects of Nanofillers and Synergistic Action of Carbon Black/Nanoclay Hybrid Fillers in Chlorobutyl Rubber

N-Doped rGO-Like Carbon Prepared from Coconut Shell: Structure and Specific Capacitance

Multi-Functional Materials Based on Cu-Doped TiO2 Ceramic Fibers with Enhanced Pseudocapacitive Performances and Their Dielectric Characteristics

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