A comparative study on structural, morphological and photocatalytic properties of anodically grown ZnO nanowires under varying parameters

Ozdemir, Erdem Tevfik; Kartal, Ugur; Dikici, Tuncay; Erol, Mustafa; Yurddaşkal, Metin

doi:10.1007/s10854-021-07115-7

Cited by 5 publications

(4 citation statements)

References 43 publications

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“…Formation of discrete bladed structures around the pits begins to form, which we will term as nanoflowers due to the high concentration of Zn +2 ions. As the reactions continue, ZnO nanowires grow all over the foil surface 21,50 …”

Section: Resultsmentioning

confidence: 99%

“…As the reactions continue, ZnO nanowires grow all over the foil surface. 21,50 SEM was operated to evaluate the morphological properties about the size and shape of grown ZnO samples with anodization. In order to form ZnO nanowire structures, using KHCO 3 as an F I G U R E 2 X-ray diffraction patterns of the nanostructured ZnO samples electrolyte is consistent with previous studies in literature.…”

Section: Surface Morphologies Of Zno Nanostructuresmentioning

confidence: 99%

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Preparation and photocatalytic performances of ZnO nanostructures: Effects of anodization voltage and time

Oksuz

Yurddaşkal

Doluel

et al. 2022

Surface & Interface Analysis

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In this study, ZnO nanostructures with different morphologies were produced by varying anodizing parameters (time and voltage), and the photocatalytic activities of these structures were examined. ZnO nanostructures were fabricated through different voltage and duration consisting of nine samples with KHCO3 solution as an electrolyte. The produced ZnO nanostructures were investigated by using X‐ray diffraction (XRD), scanning electron microscopy, X‐ray photoelectron spectroscopy, and UV–vis spectrophotometer. It was found that the morphology of ZnO was formed as nanosponge, nanoflower, nanowire, heterogeneous structures. ZnO nanostructures were identified by matching XRD peaks due to the ICDD database. Experiments on photocatalytic degradation of methylene blue demonstrated the photocatalytic activity of ZnO samples. The best photocatalytic performance of the samples was observed by S1 sample, which was anodized for 30 min in 0.05 M of KHCO3 electrolyte at 20 V, after 420 min exposure of the UV–vis light source with the degradation rate of 87.3%. Such ZnO nanostructures exhibit unique properties and have high potential for wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Surface Morphologies Of Zno Nanostructuresmentioning

confidence: 99%

Preparation and photocatalytic performances of ZnO nanostructures: Effects of anodization voltage and time

Oksuz

Yurddaşkal

Doluel

et al. 2022

Surface & Interface Analysis

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show abstract

“…It offers many unique and promising properties, such as a large exciton binding energy (60 meV), high electron mobility, good photocatalytic activity, excellent thermal and chemical stability, large piezoelectric constant and easily modified electric conductivity [188] . Therefore, nanostructured ZnO materials have been studied for many potential applications, including photoluminescence [142,146,189] , gas sensors [173,190,191] , biological applications [166,167,192] , photodetectors [151] , control of surface wettability [152,183,193] , photocatalysts [141,177,186,[194][195][196][197][198] , dye-sensitized solar cells [149] and PEC water splitting [168][169][170][171]199,200] .…”

Section: Applicationsmentioning

confidence: 99%

Anodization fabrication techniques and energy-related applications for nanostructured anodic films on transition metals

2022

Energy Mater

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Nanostructured anodic films on transition metals prepared using the electrochemical anodization method have recently attracted particular attention owing to their extraordinary properties and potential use in a variety of applications. Herein, we provide a thorough review of the anodization fabrication of anodic films with different nanostructures, including nanopores, nanotubes, nanoflowers, nanoneedles and nanowires on transition metals, focusing on the growth processes of nanostructured anodic films on three representative transition metals, namely, iron, copper and zinc. Specific consideration is given to the anodization behavior and formed film nanostructures of these transition metals. We conclude that electrolyte composition plays a key role in influencing the final morphologies of anodic films. Fluoride-containing solutions represent universal electrolytes for forming nanostructured anodic films on transition metals. The main applications of the resulting nanostructured anodic films, especially in energy-related fields, such as photoelectrochemical water splitting and supercapacitors, are also presented and discussed. Finally, we indicate the main challenges associated with the fabrication of anodic films with highly ordered nanostructures and the potential future directions of this field are indicated.

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“…However, the narrow band gap energy of CuO relates to rapid electron-hole recombination under light irradiation and, therefore, it requires stabilizing for improving its photocatalytic activity [ 13 ]. Furthermore, preparing ZnO-CuOx composites via oxidation of metallic substrates results in forming various morphologies of nanostructures that both components were proven to provide [ 14 , 15 ]. Nanostructuring the CuZn materials leads to significant development of their surface area, which is critical for catalysis.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Morphology of Barrel-Shaped Nanostructures Grown via CuZn Electro-Oxidation

et al. 2022

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Herein, we report a feasible method for forming barrel-like hybrid Cu(OH)2-ZnO structures on α-brass substrate via low-potential electro-oxidation in 1 M NaOH solution. The presented study was conducted to investigate the electrochemical behavior of CuZn in a passive range (−0.2 V–0.5 V) and its morphological changes that occur under these conditions. As found, morphology and phase composition of the grown layer strongly depend on the applied potential, and those material characteristics can be tuned by varying the operating conditions. To the best of our knowledge, the yielded morphology of barrel-like structure has not been previously observed for brass anodizing. Additionally, photoactivity under both UV and daylight irradiation-induced degradation of organic dye (methyl orange) using Cu(OH)2-ZnO composite was explored. Obtained results proved photocatalytic activity of the material that led to degradation of 43% and 36% of the compound in UV and visible light, respectively. The role of Cu(OH)2 in improving ZnO photoactivity was recognized and discussed. As implied by both the undertaken research and the literature on the subject, cupric hydroxide can act as a trap for photoexcited electrons, and thus contributes to stabilizing electron-hole recombination. This resulted in improved light-absorbing properties of the photoactive component, ZnO.

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A comparative study on structural, morphological and photocatalytic properties of anodically grown ZnO nanowires under varying parameters

Cited by 5 publications

References 43 publications

Preparation and photocatalytic performances of ZnO nanostructures: Effects of anodization voltage and time

Preparation and photocatalytic performances of ZnO nanostructures: Effects of anodization voltage and time

Anodization fabrication techniques and energy-related applications for nanostructured anodic films on transition metals

Controlling the Morphology of Barrel-Shaped Nanostructures Grown via CuZn Electro-Oxidation

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