Porous N-doped carbon/MnO2 nanoneedles for high performance ionic liquid-based supercapacitors

Zhu, Hangtian; An, Young Jae; Shi, Minjie; Li, Ziqi; Chen, Nianting; Yang, Cheng; Xiao, Pan

doi:10.1016/j.matlet.2021.129837

Cited by 41 publications

(5 citation statements)

References 6 publications

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“…This gives rise to the importance of the synthesis of Cumatrix composite with uniformly dispersed graphene. In this regard, graphene-induced bandgap widening and luminescence quenching in ceria-graphene composites has been reported elsewhere [61][62][63]. Additionally, the loading of graphene increased the absorption and photocatalytic activity of the Fe 2 O 3 in the Fe 2 O 3 /rGO composites [64][65][66][67].…”

Section: Introductionmentioning

confidence: 73%

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

et al. 2021

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In this work, a simple hydrothermal method was employed to prepare a pristine sample of copper oxide (CuO) and three samples of copper oxide–graphene nanocomposites (CuO-xG) with x = 2.5, 5, and 10 mg of graphene. The synthesized samples were characterized using X-ray powder diffractometry (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR) and ultraviolet–visible (UV-Vis) spectroscopy. The XRD patterns of CuO-xG nanocomposites exhibited the diffraction peaks related to the crystal planes of monoclinic CuO and hexagonal graphite. The surface morphology of the prepared samples was investigated using FESEM images. EDX analysis was used to investigate the chemical composition of the synthesized samples. FTIR spectroscopy identified the vibrational modes of the covalent bonds present in the samples. The allowed direct optical bandgap energy was calculated for all prepared samples using UV-Vis absorption spectra. The small bandgap of CuO-xG nanocomposites indicates their potential use as an effective photocatalyst in the presence of visible light. Photocatalytic activity of the samples was explored for the degradation of methylene blue (MB) dye contaminant under visible light irradiation. The results showed that the CuO-5G sample has the highest photodegradation efficiency (~56%).

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Section: Introductionmentioning

confidence: 73%

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

et al. 2021

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“…Zhu et al 39 reported the use of N-doped carbon-supported Fe 3 O 4 as an electrode material for SC applications and showed that the assembled SC showed a specific capacitance of 206 F/ g with an energy density of 70 W/kg and power density of 376 W/kg. Zhu et al 40 used N-doped carbon/MnO 2 nanoneedles as an electrode material for high-performance SC devices. The device reported a high specific capacitance of 188 F/g.…”

Section: Acs Applied Engineering Materialsmentioning

confidence: 99%

Nitrogen-Doped WO₃ Nanoparticles as Electrode Materials in All-in-One Supercapacitor Devices

Ammar,

Popa,

Toloman

et al. 2024

ACS Appl. Eng. Mater.

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The effect of the annealing temperature on 1% nitrogen-doped WO 3 materials was studied, which were then used as electrode materials for highperformance supercapacitor (SC) devices. The supercapacitive performance of the proposed materials was strongly influenced by the doping element and the annealing temperature by directly changing the defect structure of the host material. The 1% N-doped WO 3 materials annealed at different temperatures were thoroughly characterized through various characterization techniques, including electron paramagnetic resonance and photoluminescence spectroscopy, giving insight into the effect of N-doping on the defect structure and optical properties of WO 3 . When the WO 3 :N materials were used as electrode material in symmetric SCs, the doping element and the annealing temperature improved the electrochemical performance. No booster materials (such as carbon black) were used in the symmetric SC designs, showing increased specific capacitance (102 F/ g) and energy density (14.6 W h/kg) values.

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“…A combination of carbon nanotubes and carbon nanofibers can ideally increase storage capacity and improve longevity. Figure 35 shows a composite of carbon nanotubes with carbon nanofibers in which a 5-6 nm diameter carbon nanofiber is placed inside a 50 nm diameter carbon nanotube [25,[233][234][235][236][237]. e result of the chargedischarge test indicates an increase in capacity (Figure 36).…”

Section: Composite Of Carbon Nanotubes With Carbonmentioning

confidence: 99%

A Review of High-Energy Density Lithium-Air Battery Technology: Investigating the Effect of Oxides and Nanocatalysts

Suryatna

Raya

Thangavelu

et al. 2022

Journal of Chemistry

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In vehicles that require a lot of electricity, such as electric vehicles, it is necessary to use high-energy batteries. Among the developed batteries, the lithium-ion battery has shown better performance. This battery has an energy density of 10 equal to that of a lithium-ion battery and uses air oxygen as the active material of the cathode and anode like a lithium-ion battery made of lithium metal. The cathode used in these batteries must have special properties such as strong catalytic activity and high conductivity, and nanotechnology has greatly helped to improve the materials used in the cathode of lithium-air batteries. The importance of proper catalyst distribution and the relationship between the oxide product and the catalyst and the indirect effect of the ORR catalyst on the OER reaction is not present in the fuel cell. The maximum capacity of lithium-air battery theory using graphene under optimal electron conduction conditions and the experimental maximum obtained for graphene by optimizing the structure geometry, examples of structural engineering using carbon fiber and carbon nanotubes in cathode fabrication with the ability to perform the reaction properly while providing space for lithium oxide placement, are examined. This article describes the mechanism of this battery, and its components are examined. The challenges of using this battery and the application of nanotechnology to solve these challenges are also discussed.

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Porous N-doped carbon/MnO2 nanoneedles for high performance ionic liquid-based supercapacitors

Cited by 41 publications

References 6 publications

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

Nitrogen-Doped WO₃ Nanoparticles as Electrode Materials in All-in-One Supercapacitor Devices

A Review of High-Energy Density Lithium-Air Battery Technology: Investigating the Effect of Oxides and Nanocatalysts

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Porous N-doped carbon/MnO2 nanoneedles for high performance ionic liquid-based supercapacitors

Cited by 41 publications

References 6 publications

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

Nitrogen-Doped WO3 Nanoparticles as Electrode Materials in All-in-One Supercapacitor Devices

A Review of High-Energy Density Lithium-Air Battery Technology: Investigating the Effect of Oxides and Nanocatalysts

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Nitrogen-Doped WO₃ Nanoparticles as Electrode Materials in All-in-One Supercapacitor Devices