Influence of chromium and lanthanum incorporation on the optical properties, catalytic activity, and stability of IrOx nanostructured films for hydrogen generation

Shaban, Mohamed; Saad, Rana; Sayed, Adel M. El

doi:10.1016/j.ijhydene.2022.12.294

Cited by 5 publications

(2 citation statements)

References 64 publications

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“…Plotting (αhν) 2 vs. hν gives the E g by extending the linear portions of the curves to α = 0, as shown in Fig. 5a 24,35,36 . The derived E g are 3.275, 3.20, and 3.125 eV for ZnO pure, 2.0 at.%, and 4.0 at.% La-doped ZnO, respectively.…”

Section: Optical Propertiesmentioning

confidence: 99%

Design of high-sensitivity La-doped ZnO sensors for CO2 gas detection at room temperature

Abdelkarem,

Saad,

El Sayed

et al. 2023

Sci Rep

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For the sake of people's health and the safety of the environment, more efforts should be directed towards the fabrication of gas sensors that can operate effectively at room temperature (RT). In this context, increased attention has been paid to developing gas sensors based on rare-earth (RE)-doped transparent conducting oxides (TCO). In this report, lanthanum-doped zinc oxide (La-doped ZnO) films were fabricated by sol–gel and spin-coating techniques. XRD analysis revealed the hexagonal structure of the ZnO films, with preferred growth along the (002) direction. The crystallite size was decreased from 33.21 to 26.41 nm with increasing La content to 4.0 at.%. The UV–vis–NIR indicating that the films are highly transparent (˃ 80%), La-doping increased the UV blocking ability of the films and narrowed the optical band gap (Eg) from 3.275 to 3.125 eV. Additionally, La-doping has influenced the refractive index of the samples. Gas sensing measurements were performed at ambient temperature (30 °C) and a relative humidity (RH) of 30%, employing different flow rates of carbon dioxide (CO2) gas used synthetically with air. Among the evaluated sensors, the ZnO: 4.0 at.% La sensor exhibited the most significant gas response, with a value of 114.22%. This response was observed when the sensor was subjected to a flow rate of 200 SCCM of CO2 gas. Additionally, the sensor revealed a response time of 24.4 s and a recovery time of 44 s. The exceptional performance exhibited by the sensor makes it very appropriate for a wide range of industrial applications. Additionally, we assessed the effect of humidity, selectivity, reusability, repeatability, detection limit, and limit of quantification.

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Section: Optical Propertiesmentioning

confidence: 99%

Design of high-sensitivity La-doped ZnO sensors for CO2 gas detection at room temperature

Abdelkarem,

Saad,

El Sayed

et al. 2023

Sci Rep

Self Cite

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“…This is besides their different kinds, simple preparation routes, and environmental friendliness [3]. At the nanoscale, the increased specific surface area, high surface energy, reduced imperfections, and the effects of confinement arising from the nano-structuration modify these advantages and improve the physicochemical properties of MO, widening their multi-functionality [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Different Metal Oxides Thin Films Deposited by Spin Coating Technique

Sayed

Shaban

Said

2023

Labyrinth: Fayoum Journal of Science and Interdisciplinary Stud

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Designing and building up nanostructures that exhibit outstanding optical, electrical, mechanical, and magnetic properties, compared to bulk materials is attracting increasing attention worldwide. This work is an attempt to fabricate and characterize different metal oxides (MO) in the form of thin films that are applicable in diverse fields of industry and technology. Cobalt oxide (Co3O4), copper oxide (CuO), iridium oxide (IrO2), zinc oxide (ZnO), and cadmium oxide (CdO) thin films were prepared by the sol-gel method utilizing the spin-coating technique. The crystal structure of the films was analyzed by XRD. The films' morphology was investigated by AFM/FE-SEM. The optical properties of the films were studied in detail. XRD results indicated the high purity and good crystallinity of the prepared films. XRD and FE-SEM/AFM revealed the nanoscale and grain size of the films as well as their surface morphology and roughness. UV-vis-NIR spectroscopy was utilized to evaluate the optical properties and band structure of all films. ZnO and CdO films showed higher transmittance (79-89%) compared to about 62% for the other films. The optical band gap of the films was found to be in the range of 1.7-3.2 eV. The refractive index of the films was evaluated. The sol-gel spin-coated films are the best candidates for modern applications, including hydrogen production by water splitting, gas sensing, and optoelectronic applications.

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Improving Photocatalytic Activities of LaFeO3 Photocathode by Chromium-Incorporated Nanoparticle

Aadenan,

Arzaee,

Noh

et al. 2024

Electron. Mater. Lett.

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Influence of chromium and lanthanum incorporation on the optical properties, catalytic activity, and stability of IrOx nanostructured films for hydrogen generation

Cited by 5 publications

References 64 publications

Design of high-sensitivity La-doped ZnO sensors for CO2 gas detection at room temperature

Design of high-sensitivity La-doped ZnO sensors for CO2 gas detection at room temperature

Characterization of Different Metal Oxides Thin Films Deposited by Spin Coating Technique

Improving Photocatalytic Activities of LaFeO3 Photocathode by Chromium-Incorporated Nanoparticle

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