Influence of spray time on the optical and electrical properties of CoNi<sub>2</sub>S<sub>4</sub> thin films

Radaf, I.M. El; Fouad, S.S.; Ismail, A. M.; Sakr, G.B.

doi:10.1088/2053-1591/aaba0a

Cited by 33 publications

(3 citation statements)

References 49 publications

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“…These results agree with the previously reported data of CoNi 2 S 4 . , The bands A 1g (385 cm –1 ), E g (236 cm –1 ), T 2g,1 (352 cm –1 ), T 2g,2 (306 cm –1 ), and T 2g,3 (150 cm –1 ) are the typical vibration bands of CoNi 2 S 4 (Figure S2a). The observation of the vibration bands at 618 cm –1 (CS), 901 cm –1 (N–CS), 1370 cm –1 (C–O–C), 1620 cm –1 (OH), and 3421 cm –1 (CO–OH) in FTIR (Figure S2b) confirms the phase purity of CoNi 2 S 4 . − The scanning electron microscopy (SEM) image reveals flake-like morphology with an average particle size of 2–3 μm (Figure S7). Figure c shows the transmission electron microscopy [high resolution TEM (HRTEM)] image of CoNi 2 S 4 , and the inset shows the hexagonal-shaped particle of CoNi 2 S 4 .…”

Section: Resultsmentioning

confidence: 99%

Probing the Extent of Polysulfide Confinement Using a CoNi₂S₄ Additive Inside a Sulfur Cathode of a Na/Li–Sulfur Rechargeable Battery

Bhardwaj

Jayanthi

Adarakatti

et al. 2020

ACS Appl. Mater. Interfaces

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The extent of confinement of soluble metal polysulfides inside a sulfur cathode strongly determines the performance of metal−sulfur rechargeable batteries. This challenge has been largely tackled by loading sulfur inside various conducting porous scaffolds. However, this approach has not proven to be fully effective because of poor chemical interaction between the scaffold and polysulfides. Here, we demonstrate an excellent strategy of using a sulfide additive in the sulfur cathode, viz., cobalt nickel sulfide (CoNi 2 S 4 ), to efficiently trap the soluble polysulfides inside the sulfur cathode. In situ Raman and ex situ UV−vis spectroscopies clearly reveal higher retention of polysulfides inside CoNi 2 S 4 /S compared to bare sulfur and carbon−sulfur mixture cathodes. Against sodium, the CoNi 2 S 4 /S assembly showed remarkable cyclability both as a function of current density (at room temperature) and temperature (at constant current density). The versatility of CoNi 2 S 4 is further proven by the exemplary cyclability at various current densities at room temperature against lithium.

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Section: Resultsmentioning

confidence: 99%

Probing the Extent of Polysulfide Confinement Using a CoNi₂S₄ Additive Inside a Sulfur Cathode of a Na/Li–Sulfur Rechargeable Battery

Bhardwaj

Jayanthi

Adarakatti

et al. 2020

ACS Appl. Mater. Interfaces

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“…2D TMDs with substantial interlayer space and strong conductivity (eg, 1T WS 2 and 1T VS2 leaves) can be extremely useful in the production of high-performance supercapacitors. 43,54,55 In addition to these 1T TMDs, newly created ternary sulfides, such as Ni-Co-S, might be more interesting in supercapacitors due to their excellent stability, [56][57][58][59] sites of a rich redox reaction, and excellent electrical conductivity, [56][57][58]60 that is, the electrical conductivity of NiCo 2 S 4 is about to 10 3 S cm À1 to 10 4 S cm À1 at room temperature, 1T MoS 2 monolayer has electrical conductivity (10 S cm À1 -100 S cm À1 ) 1 to 2 times less than NiCo 2 S 4. 43 Different groups have built the supercapacitors from ternary sulfides with the traditional patterns (eg, nanofibers, 3D structures).…”

Section: D Tmds In the Supercapacitormentioning

confidence: 99%

2D‐TMDs based electrode material for supercapacitor applications

Ali

Afzal

Iqbal

et al. 2022

Intl J of Energy Research

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Transition metal dichalcogenides (TMDs) have been attracted the researchers to design high-performance electrodes to elevate power and energy density for better performance of energy storage devices. The attraction is due to the better surface area, high conductivity with distinct oxidation states, and the layered structure of TMDs. These characteristics persuade the TMDs to be the most favorable contenders to store energy via a cross-charge storage structure.TMDs belong to the family of two dimensions (2D) materials. This review article focused on graphene, molybdenum disulfide (MoS 2 ), and tungsten disulfide (WS 2 ) based electrode materials for supercapacitor applications. MoS 2 showed remarkable chemical/physical characteristics like tunable bandgap, specific surface area, mechanical friction, and high wear resistance. The researchers showed that the nanostructured materials of MoS 2 have exceptional characteristics and tremendous potential as supercapacitor electrodes. The MoS 2 composites have porous and hollow structures that display better energy storage characteristics. MoS 2 has excellent potential to fill the gap as an electrode material for energy storage devices and eco-friendly applications. There is much opportunity for scientific progress in the interdisciplinary sector. The nanostructures of WS 2 have auspicious qualities like good surface area, and excellent electrochemical characteristics, which make the WS 2 a super candidate for supercapacitor application. The WS 2 -based composites also showed excellent results for supercapacitors and other energy storage devices. Herein we study comparatively the properties of these materials discus as capacitance, energy density, power density, rate of retention, cyclic stability, and electrochemical properties.

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“…The dielectric loss factor (tan (δ)) is a valuable factor in the investigation of the structure and defects in solids and also within the sample, it represents the phase difference owing to the loss of energy. The tan (δ) is dependent on the real and imaginary part as [54,55] tan (δ) = ε2 / ε1 (8) Figure 9 depicts the graph of tan (δ) versus photon energy. Nearly constant dependence is observed at lower photon energy and a strong dependence is observed at incident energy above 2.8 eV; this because of the abrupt rise in the absorption coefficient.…”

Section: Dielectric Properties Of Zno Filmsmentioning

confidence: 99%

Investigation of dispersion parameters, dielectric properties and opto–electrical parameters of ZnO thin film grown by ALD

Zaka

Parditka

Erdélyi

et al. 2020

Optik

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Highly transparent zinc oxide thin films with varied layer thicknesses have been prepared on microscopic glass substrates at 200 °C. Films thickness was measured by stylus profilometer. The films have been investigated for their structure using X-Ray diffraction; the patterns showed their amorphous nature. The dispersion parameters i.e. refractive index (n) and extinction coefficient (k) are computed in the wavelength range (350 -2500 nm). The Tauc model was used to determine the optical band gap and Urbach tail with direct allowed transitions. The real and imaginary parts of the high frequency dielectric constant were discussed. Other parameters such as penetration depth, cut-off wavelength, dissipation factor, volume and surface energy loss functions, reflection loss factor, optical, electrical and thermal conductivities have also been determined. A systematic study of a wide range of optical parameters of ALD prepared ZnO films can serve as a valuable data source and can enrich the knowledge of the studied material.

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Influence of spray time on the optical and electrical properties of CoNi₂S₄ thin films

Cited by 33 publications

References 49 publications

Probing the Extent of Polysulfide Confinement Using a CoNi₂S₄ Additive Inside a Sulfur Cathode of a Na/Li–Sulfur Rechargeable Battery

Probing the Extent of Polysulfide Confinement Using a CoNi₂S₄ Additive Inside a Sulfur Cathode of a Na/Li–Sulfur Rechargeable Battery

2D‐TMDs based electrode material for supercapacitor applications

Investigation of dispersion parameters, dielectric properties and opto–electrical parameters of ZnO thin film grown by ALD

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Influence of spray time on the optical and electrical properties of CoNi2S4 thin films

Cited by 33 publications

References 49 publications

Probing the Extent of Polysulfide Confinement Using a CoNi2S4 Additive Inside a Sulfur Cathode of a Na/Li–Sulfur Rechargeable Battery

Probing the Extent of Polysulfide Confinement Using a CoNi2S4 Additive Inside a Sulfur Cathode of a Na/Li–Sulfur Rechargeable Battery

2D‐TMDs based electrode material for supercapacitor applications

Investigation of dispersion parameters, dielectric properties and opto–electrical parameters of ZnO thin film grown by ALD

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Influence of spray time on the optical and electrical properties of CoNi₂S₄ thin films

Probing the Extent of Polysulfide Confinement Using a CoNi₂S₄ Additive Inside a Sulfur Cathode of a Na/Li–Sulfur Rechargeable Battery

Probing the Extent of Polysulfide Confinement Using a CoNi₂S₄ Additive Inside a Sulfur Cathode of a Na/Li–Sulfur Rechargeable Battery