The influence of surface modification on the optical and capacitive properties of NiO nanoparticles synthesized via surfactant-assisted coprecipitation

Handal, Hala T.; Mohamed, Walied A.A.; Labib, Ammar A.; Moustafa, Samia A.; Sery, Alaa A.

doi:10.1016/j.est.2021.103321

Cited by 14 publications

(2 citation statements)

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“…Nitrogen adsorption-desorption isotherms and Brunauer-Emmett-Teller (BET) equation were used to determine the surface properties and the pore-size distribution of the prepared spinel. As shown from the isotherm in Figures S1 & S2 (supplementary data), the hysteresis loop proves the mesoporous character of the spinel samples which results in good contact with the electrolyte and the enhancement of electrocthemical behavior 40 . The type of isotherm is IV of hysteresis type H4 that confirms the mesoporous properties of the materials and indicates narrow slit-like pores slit-like with inner voids and broad size distribution 41 The values of the total pore volume V T , BET surface areas S bet , and the mean pore size are summarized in Table 2.…”

Section: Surface Area and Porous Texture Analysis Of The Samplesmentioning

confidence: 71%

The role of Preparation Technique on the Structure, Electrical Properties of CoxZn1-xFe2O4 and its Electrocatalytic Effect on Hydrogen Evolution Reaction

et al. 2022

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Zinc-ferrite ZnFe 2 O 4 and Co x Zn 1-x Fe 2 O 4 (x= 0.2, 0.5 and 0.8) were prepared by two different techniques. The first was the solid state reaction based on utilizing electric arc furnace dust (waste material), and the second was the microwave treatment (pure materials). The structure and characterization of the prepared samples were studied by using XRD and SEM which ensured the formation of cubic spinel structure with some hematite phases. The physical properties as the density and porosity were measured where the microwave samples showed lower porosity and higher density than the solid state samples. Semiconducting properties has been observed for the prepared samples. The electrocatalytic activity of the hydrogen evolution reaction (HER) has been studied for all the samples in 1.0 M KOH (25 °C) by cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance techniques. The results showed that the catalytic activity increased with increase of Co content as the surface area and the total pore volume increases in the ferrite prepared by solid state method while Co 0.2 Zn 0.8 Fe 2 O 4 prepared by microwave method showed the highest surface area and optimum improvement in the apparent HER catalytic activity. Lower resistance and faster charge transfer were shown for Co x Zn 1-x Fe 2 O 4 than the pure phase.

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Section: Surface Area and Porous Texture Analysis Of The Samplesmentioning

confidence: 71%

The role of Preparation Technique on the Structure, Electrical Properties of CoxZn1-xFe2O4 and its Electrocatalytic Effect on Hydrogen Evolution Reaction

et al. 2022

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“…Nonlinear behavior for the charge-discharge of Fe 0.8 Se 0.14 Si 0.06 MoO 4 was observed indicating pseudocapacitive behavior (faradic) as shown previously from CV measurement. The specific capacitances at different current densities for Fe 0.8 Se 0.14 Si 0.06 MoO 4 were calculated via the following equation [47,48]:…”

Section: Drs Spectral Studymentioning

confidence: 99%

Microstructures, optical and electrochemical properties of advanced Fe_0.8Se_0.14Si_0.06MoO₄ nanocrystalline for energy storage applications

2023

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Technological progress has raised expectations regarding the growth of energy storage structures. Enhancing the energy density and surface area and producing a high specific capacitance supercapacitor is urgently demanded. The microstructural and optical properties of Fe0.8Se0.14Si0.06MoO4 nanocrystallites produced by the advanced sol-gel technique are investigated. XRD and TEM show that the nanocrystallites have a crystallite nanosize of 15.6 nm and a mean diameter of 14-23.6 nm for the formed monoclinic structure. The diffuse reflectance spectra of the synthesized Fe0.8Se0.14Si0.06MoO4 calcined at 650 oC for 2h were measured in the range of 200 to 2500 nm. The type and value of the energy band gap were obtained from the diffuse reflectance spectra. Enhancing the energy density and surface area and producing a high specific capacitance of the supercapacitor is urgently required to develop unique positive and negative electroactive nanostructures. The formation of advanced Fe0.8Se0.14Si0.06MoO4 mesoporous structures with large surface areas and adjusted energy band gap could expand more electroactive locations, which supported the contact of the electrode-electrolyte and improved the ion and electron passage through the chemical reactions. The good electrochemical performance of Fe0.8Se0.14Si0.06MoO4 was exhibited with a high specific capacitance of 681.6 F/g at 1.0 A/g. The specific capacitance decreased to 396.8 F/g after 1000 charge-discharge cycles at 1.0 A/g. Therefore, Fe0.8Se0.14Si0.06MoO4 was suggested as a promising positive electrode material for energy storage applications.

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Facial design and synthesis of Ce doped Co-Ni oxide nanocages with cubic structure for high-performance asymmetric supercapacitors

Gao

Wang

Shen

et al. 2023

Applied Surface Science

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The influence of surface modification on the optical and capacitive properties of NiO nanoparticles synthesized via surfactant-assisted coprecipitation

Cited by 14 publications

References 96 publications

The role of Preparation Technique on the Structure, Electrical Properties of CoxZn1-xFe2O4 and its Electrocatalytic Effect on Hydrogen Evolution Reaction

The role of Preparation Technique on the Structure, Electrical Properties of CoxZn1-xFe2O4 and its Electrocatalytic Effect on Hydrogen Evolution Reaction

Microstructures, optical and electrochemical properties of advanced Fe_0.8Se_0.14Si_0.06MoO₄ nanocrystalline for energy storage applications

Facial design and synthesis of Ce doped Co-Ni oxide nanocages with cubic structure for high-performance asymmetric supercapacitors

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The influence of surface modification on the optical and capacitive properties of NiO nanoparticles synthesized via surfactant-assisted coprecipitation

Cited by 14 publications

References 96 publications

The role of Preparation Technique on the Structure, Electrical Properties of CoxZn1-xFe2O4 and its Electrocatalytic Effect on Hydrogen Evolution Reaction

The role of Preparation Technique on the Structure, Electrical Properties of CoxZn1-xFe2O4 and its Electrocatalytic Effect on Hydrogen Evolution Reaction

Microstructures, optical and electrochemical properties of advanced Fe0.8Se0.14Si0.06MoO4 nanocrystalline for energy storage applications

Facial design and synthesis of Ce doped Co-Ni oxide nanocages with cubic structure for high-performance asymmetric supercapacitors

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Microstructures, optical and electrochemical properties of advanced Fe_0.8Se_0.14Si_0.06MoO₄ nanocrystalline for energy storage applications