Influence of magnetic fields on the morphology and pseudocapacitive properties of NiO on nickel foam

Lu, Yisheng; Zhu, Tao; Zhang, Guoxiong; He, Zhenni; Lin, Cheng-Ju; Chen, Yigang; Guo, Haibo

doi:10.1039/c5ra17478c

Cited by 14 publications

(9 citation statements)

References 46 publications

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“…Nickel oxide nanoflower for gas sensing of nanoneedle and nanosheet Nickel oxide (NiO) is a semiconductor having higher band width (3.6-4 ev) and is highly thermostable. NiO shows various applications in gas sensing, glucose sensing, battery cathoding, catalysis and supercapacitor electrode [55][56][57][58][59][60][61] and semiconductor as it has electrical, magnetic and optical properties. Nanoflowers showed unique physicochemical properties in contrast with conventional nanoparticles.…”

Section: Zinc Oxide Nanoflower Showing Enhanced Photocatalytic Activitymentioning

confidence: 99%

Nanoflowers: the future trend of nanotechnology for multi-applications

Shende

Kasture

Gaud

2018

Artificial Cells, Nanomedicine, and Biotechnology

158

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Nanoflowers are a newly developed class of nanoparticles showing structure similar to flower and gaining much attention due to their simple method of preparation, high stability and enhance efficiency. This article focuses on advantages, disadvantages, method of synthesis, types and applications of nanoflowers with futuristic approaches. The applications of nanoflower include its use as a biosensor for quick and precise detection of conditions like diabetes, Parkinsonism, Alzheimer, food infection, etc. Nanoflowers have been revealed for site-specific action and controlled delivery of drugs. The extended applications of nanoflowers cover purification of enzyme, removal of dye and heavy metal from water, gas-sensing using nickel oxide. Recent investigation shows 3 D structure of nanoflowers for enhancing surface sensitivity using Raman spectroscopy. This nanoflower system will act as a smart material in the near future due to high surface-to-volume ratio and enhance adsorption efficiency on its petals.

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Section: Zinc Oxide Nanoflower Showing Enhanced Photocatalytic Activitymentioning

confidence: 99%

Nanoflowers: the future trend of nanotechnology for multi-applications

Shende

Kasture

Gaud

2018

Artificial Cells, Nanomedicine, and Biotechnology

158

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“…Very recently, there have been few studies on energy storage technologies such as supercapacitors and Li-batteries, where appreciable modifications in the electrochemical performance have been reported. − These effects are quite prominent in supercapacitors fabricated using metal oxides that have at least one magnetic ion. Most of the authors, including us, have attributed the change to the changing Lorentz force and/or magneto-hydrodynamic effects. − However, the literature lacks a suitable theoretical model that explains the experimental data and incorporates the impact of the radius of electrolyte’s ion, which is critical in the case of magnetic supercapacitors. The size of the electrolyte ion should be considered because the kinetic energy of the ions will be directly modulated by the Lorentz force experienced by them.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Model for Magnetic Supercapacitors—From the Electrode Material to Electrolyte Ion Dependence

et al. 2020

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Recent results have shown that electrochemical energy storage devices can change their characteristics near the magnetic field environment. Mostly, this change is attributed to the magnetically responsive electrode materials. It is still not expected that significant change can also be induced under a magnetic field by replacing nonmagnetic electrolytes. In this paper, it is clearly shown that this 'change' does occur and its magnitude can be as high as 50%. To date, a Nernstian relation across the electrode is used to explain the supercapacitive behavior of a cell, ignoring the contributions from the magnetic field, even if it is present in the surroundings of the device. Therefore, it is necessary to modify these well-established theoretical models to explain the magnetic field-dependent behavior in energy storage devices. It is shown that the Lorentz force plays a consequential role in inducing colossal changes in the specific capacitance of a supercapacitor. Seven different nonmagnetic electrolytes are combined with Fe 2 O 3 electrodes to prove the proposed concept. The modified theory leads to consistent results, which are corroborated with the experimental data.

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“…In this study, we aim to reduce the porousness of the NiO film by placing permanent magnets above and below the substrate of the sparking method. This strategy helps to create a uniform magnetic flux, causing the uniform alignment of particles, which reduces the gaps at the surface of the NiO film [17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of NiO film by sparking method under a magnetic field and NiO/ZnO heterojunction

Tippo

Thongsuwan

Wiranwetchayan

et al. 2020

Mater. Res. Express

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Nickel oxide (NiO) film receives attention from the field of optoelectronics due to its wide band gap and high transparency. By using a sparking method, the deposition of the NiO film is facile and unique. However, the NiO film made by the sparking method indicates a porous surface with an agglomeration of its particles. In order to reduce the porousness of the NiO film, the assistance of a permanent magnet in the sparking apparatus is presented. Here, we report the investigation of the NiO film and the p-NiO/n-ZnO heterojunction deposited by the sparking method under a magnetic field. Our results demonstrate that the porosity of the NiO film was reduced by increasing the magnitude of a magnetic field from 0 mT to 375 mT. Furthermore, the crystallinity and the electrical properties of the NiO film are improved by the influent of a magnetic field. For heterojunction, the best device shows the rectification ratio of 95 and the ideality factor of 4.92. This work provides an alternative method for the deposition of the NiO film with promising applications in optoelectronic devices.

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Influence of magnetic fields on the morphology and pseudocapacitive properties of NiO on nickel foam

Abstract: Nanostructured nickel oxide (NiO) films have been successfully deposited on nickel foam by a simple magnetic-field-assisted hydrothermal method, followed by calcination in air.

Cited by 14 publications

References 46 publications

Nanoflowers: the future trend of nanotechnology for multi-applications

Nanoflowers: the future trend of nanotechnology for multi-applications

Theoretical Model for Magnetic Supercapacitors—From the Electrode Material to Electrolyte Ion Dependence

Investigation of NiO film by sparking method under a magnetic field and NiO/ZnO heterojunction

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