<i>In situ</i> kinetics studies of Zn–Al LDH intercalation with corrosion related species

Iuzviuk, Mariia H.; Bouali, Anissa C.; Serdechnova, Maria; Yasakau, K.A.; Wieland, D. C. Florian; Dovzhenko, Gleb; Mikhailau, Aliaksandr; Blawert, Carsten; Zobkalo, I.A.; Ferreira, M.G.S.; Zheludkevich, Mikhail L.

doi:10.1039/d0cp01765e

Cited by 21 publications

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“…Regarding ZnFe–Cl and ZnAl–NO 3 , the patterns can be described with a hexagonal cell with R 3̅ m space group symmetry, with the following cell parameters which correspond to the (003) d -spacing values of 7.81 and 8.94 Å, respectively. These results are in accordance with LDH structures previously reported in the literature. ,, …”

Section: Resultssupporting

confidence: 93%

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

et al. 2021

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Miniaturized low-cost sensors for volatile organic compounds (VOCs) have the potentiality to become a fundamental tool for indoor and outdoor air quality monitoring, to significantly improve everyday life. Layered double hydroxides (LDHs) belong to the class of anionic clays and are largely employed for NO x detection, while few results are reported on VOCs. In this work, a novel LDH coprecipitation method is proposed. For the first time, a study comparing four LDHs (ZnAl−Cl, ZnFe−Cl, ZnAl− NO 3 , and MgAl−NO 3 ) is carried out to investigate the sensing performances. As explored through several microscopy and spectroscopy analyses, LDHs show a morphology characterized by a large surface area and a three-dimensional hierarchical flowerlike architecture with micro-and nanopores that induce a fast diffusion and highly effective surface interaction of the target gases. The fabricated sensors, operating at room temperature, are able to reversibly and selectively detect acetone, ethanol, ammonia, and chlorine vapors, reaching significant sensing response values up to 6% at 21 °C. The results demonstrate that by changing the LDHs' composition, it is possible to modulate the sensitivity and selectivity of the sensor, helping the discrimination of different analytes, and the consequent integration on a sensor array paves the way for electronic nose development.

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Section: Resultssupporting

confidence: 93%

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

et al. 2021

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“…67−71 It has been previously applied to investigate the kinetics of LDH anionexchange reaction. 49,72 The AE equation can be expressed as follows…”

Section: ■ Resultsmentioning

confidence: 99%

“…70,71,75,76 In addition to the above kinetic calculations, the evolution of the LDH flake size "L" was determined using the Scherrer equation (eq 3). 72,77,78…”

Section: ■ Resultsmentioning

confidence: 99%

“…The kinetics data from the in situ synchrotron XRD measurements were analyzed by the Avrami–Erofe’ev (AE) kinetic model. − It has been previously applied to investigate the kinetics of LDH anion-exchange reaction. , The AE equation can be expressed as follows where t 0 [s] represents the induction time of the reaction and k [1/s] is linked to the reaction rate. The extent of the reaction α( t ) = I hkl ( t )/ I hkl (max), where I hkl ( t ) is the integral intensity of the ( hkl ) peak and I hkl (max) is the maximum intensity of this peak.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to the above kinetic calculations, the evolution of the LDH flake size “ L ” was determined using the Scherrer equation (eq 3). ,, where K is the Scherrer parameter (∼0.9), λ is the wavelength, β is the full width at half-maximum (FWHM), and θ is the Bragg angle. For the analysis, the FWHM of the (003) reflections was considered.…”

Section: Discussionmentioning

confidence: 99%

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Mechanism of LDH Direct Growth on Aluminum Alloy Surface: A Kinetic and Morphological Approach

et al. 2021

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The growth of ZnAl layered double hydroxide (LDH) on the AA2024 surface was monitored using synchrotron high-resolution X-ray diffraction. Data were analyzed using the Avrami–Erofe’ev kinetic model. Accordingly, the LDH film growth is governed by a two-dimensional (2D) diffusion-controlled reaction with a zero nucleation rate. Additional methods, including ex situ atomic force microscopy/scanning Kelvin probe force microscopy (AFM/SKPFM) supported by in situ open-circuit potential (OCP) measurements together with scanning electron microscopy (SEM) and transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM/EDX) analysis, provided further insight into the different stages of the mechanism of LDH growth. Prior to the conversion coating formation, an intermediate layer is formed as a basis for the establishment of the LDH flakes. Moreover, a Cu-rich layer was revealed, which could contribute to the acceleration of LDH growth. The formed LDH layer does not show any cracks at the interface but presents minor irregularities in the structure, which could favor adhesion to subsequent organic coatings. The findings presented in this work provide an important insight to the corrosion performance of the LDH conversion coatings and the pathway to adopt for further optimization.

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Layered double hydroxides (LDHs) as functional materials for the corrosion protection of aluminum alloys: A review

Bouali

Serdechnova

Blawert

et al. 2020

Applied Materials Today

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In situ kinetics studies of Zn–Al LDH intercalation with corrosion related species

Abstract: Kinetics parameters for three anion exchange reactions - Zn-LDH-NO3 → Zn-LDH-Cl, Zn-LDH-NO3 → Zn-LDH-SO4 and Zn-LDH-NO3 → Zn-LDH-VOx - were obtained by in situ synchrotron study. The first and the...

Cited by 21 publications

References 50 publications

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

Mechanism of LDH Direct Growth on Aluminum Alloy Surface: A Kinetic and Morphological Approach

Layered double hydroxides (LDHs) as functional materials for the corrosion protection of aluminum alloys: A review

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