Oxygen reduction at electrodeposited ZnO layers in alkaline solution

Prestat, Michel; Vucko, Flavien; Lescop, Benoît; Rioual, Stéphane; Peltier, F.; Thierry, Dominique

doi:10.1016/j.electacta.2016.09.050

Cited by 14 publications

(21 citation statements)

References 57 publications

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“…In combination with XRD results, it can be concluded that the layers are only partly crystalline (with no preferred orientation). [19,44] The morphology of the layers was investigated with scanning electron microscopy ( Figure 4). [20] The XPS analysis of the non-textured films is shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

“…Cathodic polarization curves of the non-textured ZnO (black curve, this study) and of electrodeposited ZnO (red curve, for comparison purpose [19] ) recorded at a rotation rate 1000 rpm and at scan rates of 0.4-0.5 mV/s. Using experimental data collected with the RRDE technique, the ratio k 1 k 2 (ratio of direct over indirect reduction) could be evaluated.…”

Section: Discussionmentioning

confidence: 99%

“…The derived α Auger parameter is 2011 eV, close to the value expected for ZnO (2010.4 eV). [19,44] The morphology of the layers was investigated with scanning electron microscopy (Figure 4). Top-view SEM micrographs ( Figure 4a) show that the ZnO films are made of a base layer on top of which one can see spherical "nodules" with a diameter of ca.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

“…[5,16] The electrochemical behavior of passive zinc producing hydrogen peroxide (pathway k 2 ) and active (reduced) zinc generating only OH À anions (pathway k 1 ) was more recently modelled by Flitt et al [17] The transition between passive and active states was experimentally evidenced by a reduction peak in the polarization curves (recorded potentiodynamically in the cathodic direction). [18,19] Furthermore, the ORR inhibition properties of ZnO (or ZnOcontaining) patinas have been reported in the literature. 1200 nm) prepared by electrodeposition, the ORR kinetics was found to be mostly governed by the direct reduction pathway.…”

Section: Introductionmentioning

confidence: 99%

“…1200 nm) prepared by electrodeposition, the ORR kinetics was found to be mostly governed by the direct reduction pathway. [18,19] Furthermore, the ORR inhibition properties of ZnO (or ZnOcontaining) patinas have been reported in the literature. Thin nanostructured ZnO layers with no preferred orientation were grown on zinc, both anodically and cathodically in NaCl electrolyte.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Reduction Investigation on Sputtered ZnO Layers with Nano‐granular Structure

et al. 2019

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Zinc oxide (ZnO) films with nano-granular structure were deposited by radio-frequency magnetron sputtering. The absence of preferred orientation was verified by XRD. HAADF-STEM images revealed a nanoporous structure with pore and grain sizes around 10 nm. The narrowness of the pores enabled to approximate that oxygen reduction takes place at the surface of the layers. During cathodic polarization, the surface of the electrodes became rougher due to the development of nodules on the surface. The ZnO electrodes exhibit a high activity towards oxygen reduction in KOH solution (pH = 10). Rotating ring-disk electrode measurements coupled with reaction modelling allowed to quantitatively demonstrate that the direct reduction prevailed with the indirect pathway being active as well.[a] Dr.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Electrochemical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxygen Reduction Investigation on Sputtered ZnO Layers with Nano‐granular Structure

et al. 2019

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Cathodic Corrosion of Zinc under Potentiostatic Conditions in NaCl Solutions

et al. 2018

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Zinc electrodes were polarized cathodically at moderate overpotentials in NaCl 0.6 M solutions under potentiostatic conditions for 7 to 17 hours at room temperature. Corrosion products were characterized by using optical microscopy, XRD, Raman microscopy, XPS, and FIB-SEM. Close to the open-circuit potential, the corrosion products were formed by simonkolleite and the electrochemical response exhibits anodic features. At more negative potentials, the current density remains cathodic throughout the polarization and the deposits on the electrode surface consist almost solely of ZnO. The soluble zinc species necessary for ZnO deposition originate from localized dissolution of the substrate in the form of pits. This effect is assigned to the strong alkalinization of the surface due to oxygen reduction. Despite developing greater surface area than bare zinc substrates, the nanostructured ZnO deposits reduced the cathodic activity.[a] Dr.

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Impedance Spectroscopy Analysis of Structural Defects in Sputtered ZnO Films

et al. 2020

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The degradation of sputtered columnar ZnO layers under DC polarization was studied by using electrochemical impedance spectroscopy and electron microscopy. It was found that the structure of the as-deposited ZnO film was dense at the nanoscale. An equivalent circuit model including de Levie impedance accounted for the localized propagation of microscale cracks towards the copper substrate. This generates a capacitance (C ZnO ) that represents the crack surface area in contact with the electrolyte. C ZnO is small enough not to be obscured by the double layer capacitance at the top of the layers and increases with increasingly negative potential and time. These results were compared to nanoporous ZnO layers that behave differently and exhibit a large C ZnO . The combination of in situ EIS analysis with the ex situ structural information provided by electron microscopy proved to be an efficient methodology to characterize very different microstructures of conductive coatings.

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Oxygen reduction at electrodeposited ZnO layers in alkaline solution

Cited by 14 publications

References 57 publications

Oxygen Reduction Investigation on Sputtered ZnO Layers with Nano‐granular Structure

Oxygen Reduction Investigation on Sputtered ZnO Layers with Nano‐granular Structure

Cathodic Corrosion of Zinc under Potentiostatic Conditions in NaCl Solutions

Impedance Spectroscopy Analysis of Structural Defects in Sputtered ZnO Films

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