Ultra-Fine Ruthenium Oxide Quantum Dots/Reduced Graphene Oxide Composite as Electrodes for High-Performance Supercapacitors

Zhao, Jie; Zhang, Jianmin; Yin, Hang; Zhang, Xiaochen; Xu, Guangxu; Yuan, Jinshi; Mo, Xiaoyao; Tang, Jie; Wang, Fengyun

doi:10.3390/nano12071210

Cited by 20 publications

(7 citation statements)

References 44 publications

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“…The outstanding properties of this 2D material have led to many application proposals. To cite just a few of them: nanocomposites for bone tissue engineering [3], composites for multifunctional applications [4], lubrication [5,6], solar cells [7], ultracapacitors [8,9], batteries [10], sensors [11], catalysis [12], nanomedicine [13], fuel cells [14,15] or even energy harvesting [16].…”

Section: Introductionmentioning

confidence: 99%

Quantum Revivals in Curved Graphene Nanoflakes

2022

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Graphene nanostructures have attracted a lot of attention in recent years due to their unconventional properties. We have employed Density Functional Theory to study the mechanical and electronic properties of curved graphene nanoflakes. We explore hexagonal flakes relaxed with different boundary conditions: (i) all atoms on a perfect spherical sector, (ii) only border atoms forced to be on the spherical sector, and (iii) only vertex atoms forced to be on the spherical sector. For each case, we have analysed the behaviour of curvature energy and of quantum regeneration times (classical and revival) as the spherical sector radius changes. Revival time presents in one case a divergence usually associated with a phase transition, probably caused by the pseudomagnetic field created by the curvature. This could be the first case of a phase transition in graphene nanostructures without the presence of external electric or magnetic fields.

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Section: Introductionmentioning

confidence: 99%

Quantum Revivals in Curved Graphene Nanoflakes

2022

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“…Wave numbers between 1590.25 and 1513.3 cm -1 were attributed to C=C group existence. A peak with a radius of 3743.45 cm -1 that is associated with O-H stretching vibrations [7,[11][12][13]. The stretching of C-O groups is responsible for the adsorption spectra equal to 1444.89, 1250.61, and 1186.5 cm -1 .…”

Section: Characterizationmentioning

confidence: 99%

Synthesis, characterization, photoluminescent properties of carbon quantum dots and its applications in wastewater treatment

Nizam

Hanafiah

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Carbon-based nanomaterials are currently gaining attention in wastewater treatment. They have gained a prime position in membrane filtration to degrade pollutants. One of the most recent additions to the field of carbon-based nanomaterials is quantum dots (QDs). Due to their exceptional qualities, QDs are among the most promising carbon-based nanomaterials at the forefront of the wastewater treatment research field. Nonetheless, most quantum dots were not sustainably fabricated. Therefore, this study aims to evaluate the carbon-based carbon quantum dots derived from biomass wastes (rubber seed shells) where the properties, behaviour and photoluminescence characteristics were evaluated through several characterization analyses. The QDs were characterized using Fourier-transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), field emission scanning electron microscope (FESEM) equipped with energy-dispersive X-ray spectroscopy (EDX), photoluminescence spectroscopy, zeta potential analyser and Raman spectroscopy. The morphological analysis revealed multi-layered planes with highly porous and uneven surfaces, consisting of a large number of oxygen-functional groups (hydroxyl, carboxyl, carbonyl). The mapping results showed a large uniform distribution of carbon and oxygen elements on the surface of QDs with a more signified composition of wt% carbon (72.4%) compared to oxygen elements, with 23.6%. The spectroscopic and photoluminescence studies confirmed the fabrication of high-quality carbon quantum dots with blue-greenish fluorescence emissions. These results have shown promising biomass-based QDs that can be applied in wastewater treatment based on their unique characteristics. Thus, the derived biomass-based QDs can be viewed as a promising and cost-effective adsorbent for wastewater and water treatment.

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“…Orderly mesoporous fullerene/carbon hybrids were synthesized by combining the fullerene precursor in chloronaphthalene with varying quantities of sucrose CeO 2 /graphene 782 F/g 82% retention after 6000 cycles [54] nitrogen-doped carbon nano-onions (N-CNO) 205 F/ g 96% retention after 5000 cycles [55] MXene/graphene 183.5 F/ cm 3 75% retention after 3000 cycles [56] CNT@PANI 138F/g 86% retention after 1000 cycles [57] RGO/MWCNT/ZrO2 357 F/ g 98% retention after 5000 cycles [58] MnO 2 /CoWO 4 / nitrogen-doped carbon nanoonions (NCNO) 536 F/g 96% retention after 3000 cycles [59] RuO 2 quantum dots / RGO 1120 F/ g 89% retention after 10,000 cycles [60] Tetraaniline(TA)/porous RGO 85.6 F/g 104.7% after 10,000 cycles [61] Table 1. Some latest fabricated carbon-based supercapacitor electrodes.…”

Section: Fullerenementioning

confidence: 99%

Carbon Nanomaterials Based Supercapacitors: Recent Trends

Atta¹,

Ahmed²

2023

Updates on Supercapacitors

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The increasing demand for renewable energy sources worldwide and the predicted depletion of current fossil fuel sources need continuous energy storage and conversion technology development. The use of supercapacitors (SC) as electrical energy storage devices in consumer electronics items and alternative power sources is an interesting and potentially lucrative area of application. Therefore, continuous developments are conducted to improve SC performance using different composites and nanocomposites. Carbon materials in SC are among the most important uses of this material. This chapter provides a short communication on recent progress in supercapacitor-based carbon materials. Various fundamental carbon allotropes were presented and debated, including fullerene, carbon nanotubes, and graphene-based supercapacitors.

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Ultra-Fine Ruthenium Oxide Quantum Dots/Reduced Graphene Oxide Composite as Electrodes for High-Performance Supercapacitors

Cited by 20 publications

References 44 publications

Quantum Revivals in Curved Graphene Nanoflakes

Quantum Revivals in Curved Graphene Nanoflakes

Synthesis, characterization, photoluminescent properties of carbon quantum dots and its applications in wastewater treatment

Carbon Nanomaterials Based Supercapacitors: Recent Trends

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