Optical properties determination of NiFe2O4 nanoparticles and their photocatalytic evaluation towards hydrogen production

Domínguez-Arvizu, Jorge L.; Jiménez-Miramontes, Jaime A.; Salinas-Gutiérrez, Jesús M.; Meléndez-Zaragoza, M.J.; López-Ortíz, Alejandro; Collins-Martı́nez, V.

doi:10.1016/j.ijhydene.2017.09.180

Cited by 36 publications

(4 citation statements)

References 21 publications

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“…Kalam et al [21] synthesized cobalt ferrite by the modified solvothermal method and measured band gap values of 2.5, 2.6 and 2.65 eV for nanoparticles with sizes of 15 nm, 12.38 nm and 11.85 nm. Accordingly to those authors, the band gap is affected by several factors, such as the crystallite size, lattice parameter, presence of impurities, and degree of disorder of the crystalline structure [31,39,58,59]. In the light of our XRD and SEM analysis, we can conclude that the trend related to the the band gap of the herein synthesized nickel ferrites is due to their difference in the crystallite size.…”

Section: Optical Propertiessupporting

confidence: 70%

“…Where α is the absorbance, hv is the photon energy, k is the absorption constant that depends on the properties of the material, Egap is the range of the optical band, and "n" represents the nature of the electronic transition in the material (0.5 or 2 for allowed direct or allowed indirect transitions). Nickel ferrite is reported as a semiconductor that has a direct allowed electronic transition [27,39,[58][59][60], hence the optical band gap for the absorption peak can be obtained by extrapolating the linear portion of the plot (α )² vs. hv to zero [21,58] as shown in Fig. 4 for samples produced at pH 3 and 9.…”

Section: Optical Propertiesmentioning

confidence: 99%

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Silva¹,

Raimundo²,

Ferreira³

et al. 2021

Preprint

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In this paper we studied the production of single-phase NiFe2O4 powders synthesized by the complexation method combining EDTA-citrate. The structural, optical, magnetic, and electrochemical properties of were studied as a function of the synthesis pH. Powders obtained with pH 9 showed larger crystallite sizes (73 nm) in comparison to those produced with pH 3 (21 nm). The band gap energy was found to be inversely proportional to the crystal size (1.85 and 2.0 eV for powders with crystallites of 73 nm and 21 nm, respectively). The synthesized materials presented an inverse spinel crystalline structure. The samples obtained at higher pH conditions were found to be fully magnetic saturated with a saturation magnetization of 50.5 emu g-1, while that synthesized at pH 3 is unsaturated with a maximum measured magnetization of 48.4 emu g-1. Cyclic voltammetry and charge-discharge curves indicate a battery-type behavior, with an better performance for the material obtained at pH 9 (65 C g-1 at a specific current of 3 A g-1). The remarkable performance of the associated with its by microstructural characteristics (particle size, particle agglomeration and porosity). This work offers an alternative synthesis route for obtaining spinel ferrites for magnetic and electrochemical applications.

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Section: Optical Propertiessupporting

confidence: 70%

Section: Optical Propertiesmentioning

confidence: 99%

The authors have requested that this preprint be removed from Research Square.

Silva¹,

Raimundo²,

Ferreira³

et al. 2021

Preprint

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“…This mesoporous ferrite was shown to be stable up to three photocatalytic runs without any loss of activity and without structural or morphological modifications. after calcination temperature of 400 °C, which was determined as the minimum one to remove all the organic matter after the chelation step [156]. The authors studied some optical characteristics such as the absorption spectrum and scattering, absorption and extinction coefficients, as a basis for future designs of photoreactors using this catalyst.…”

Section: Single-phase Ferrite Photocatalystsmentioning

confidence: 99%

Ferrite Materials for Photoassisted Environmental and Solar Fuels Applications

et al. 2019

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Ferrites are a large class of oxides containing Fe 3+ and at least another metal cation that have been investigated for and applied to a wide variety of fields ranging from mature technologies like circuitry, permanent magnets, magnetic recording and microwave devices to the most recent developments in areas like bioimaging, gas sensing, and photocatalysis. In the last respect, although ferrites have been less studied than other types of semiconductors, they present interesting properties such as visible light absorption, tuneable optoelectronic properties and high chemical and photochemical stability. The versatility of their chemical composition and of their crystallographic structure opened a playground for developing new catalysts with enhanced efficiency. This article reviews the recent development of the application of ferrites to photoassisted processes for environmental remediation and for the synthesis of solar fuels. Applications in the photocatalytic degradation of pollutants in water and air, photo-Fenton, and solar fuels production, via photocatalytic and photoelectrochemical water splitting and CO2 reduction, are reviewed paying special attention to the relationships between the physico-chemical characteristics of the ferrite materials and their photo-activated performance.

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“…These nanocomposites exhibit better catalytic performance compared to pristine mesoporous Carbon Nitride [47]. NiFe2O4 is a promising candidate for photocatalytic hydrogen production, as it can produce more hydrogen gas per unit mass and is more efficient at utilizing visible light, potentially offering economic and environmental benefits in the development of photocatalytic reactors for hydrogen production [48]. Combining NiFe2O4 with other active materials in a heterojunction leads to a cooperative effort among multiple active species, resulting in an improved Oxygen evolution Reaction performance [49].…”

Section: Versatile Applicationsmentioning

confidence: 99%

Optoelectronic behavior of some spinel oxides for sustainable engineering

Karthika,

Srivastava

2023

E3S Web Conf.

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Spinel oxides have a pivotal role in material science due to their structural, electrical, magnetic and optical properties, rendering them essential for wide range of applications. Spinel oxides, characterized by their spinel crystal structure, belong to a group of inorganic compounds with a general chemical formula of AB2O4, where A and B represent distinct metal ions. These compounds are frequently encountered in minerals, rocks, and soils, and their versatility makes them invaluable in numerous domains, including catalysis, energy storage, electronics, and ceramics. This paper briefly reports existing fascinating structural, opto-electronic properties of some spinel oxides, to understand electronic band structure, density of states and optical properties such as dielectric function, refractive index, absorption, reflectivity and optical conductivity for their applications in engineering devices. Basically, spinel compounds have physical properties such as high reflectivity, high melting point, high strength and chemical resistivity at elevated temperatures as well as low electrical loss. Therefore, we have made an attempt to showcase considered properties of these materials at one place.

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Optical properties determination of NiFe2O4 nanoparticles and their photocatalytic evaluation towards hydrogen production

Cited by 36 publications

References 21 publications

The authors have requested that this preprint be removed from Research Square.

The authors have requested that this preprint be removed from Research Square.

Ferrite Materials for Photoassisted Environmental and Solar Fuels Applications

Optoelectronic behavior of some spinel oxides for sustainable engineering

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