Investigation of the electrical properties, charging process, and passivation of RuO2–Ta2O5 oxide films

Ribeiro, Josimar; Andrade, Adalgisa R. de

doi:10.1016/j.jelechem.2006.05.004

Cited by 30 publications

(24 citation statements)

References 52 publications

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“…The solution changed from colorless to gray indicating that the film was partially dissolved during longterm operation at high current densities. A similar result was observed for electrodes prepared by SD [4,37]. Table 2 gives the results obtained by EDS for thin films investigated in this work before and after ALT.…”

Section: Sem and Eds Analysis Of The Ruo 2 -Ta 2 O 5 Electrodessupporting

confidence: 81%

“…Therefore, it can be concluded that the main reason for deactivation is the progressive growth of an insulating TiO x layer. A similar conclusion was obtained for the same electrodes prepared by SD, which were investigated by electrochemical impedance spectroscopy (EIS) [37]. Table 2 shows the average ALT values for the RuO 2 -Ta 2 O 5 system as a function of the amount of Ru in the film for both the DPP and SD methods [4].…”

Section: Accelerated Life Test (Alt)supporting

confidence: 73%

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Morphological and electrochemical investigation of RuO2–Ta2O5 oxide films prepared by the Pechini–Adams method

2008

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Preparation methods can profoundly affect the structural and electrochemical properties of electrocatalytic coatings. In this investigation, RuO 2 -Ta 2 O 5 thin films containing between 10 and 90 at.% Ru were prepared by the Pechini-Adams method. These coatings were electrochemically and physically characterized by cyclic voltammetry, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The composition and morphology of the oxide were investigated before and after accelerated life tests (ALT) by EDX and SEM. SEM results indicate typical mud-flat-cracking morphology for the majority of the films. High resolution SEMs reveal that pure oxide phases exhibit nanoporosity while binary compositions display a very compact structure. EDX analyses reveal considerable amounts of Ru in the coating even after total deactivation. XRD indicated a rutile-type structure for RuO 2 and orthorhombic structure for Ta 2 O 5 . XPS data demonstrate that the binding energy of Ta is affected by Ru addition in the thin films, but the binding energy of Ru is not likewise influenced by Ta. The stability of the electrodes was evaluated by ALT performed at 750 mA cm -2 in 80°C 0.5 mol dm -3 H 2 SO 4 . The performance of electrodes prepared by the Pechini-Adams method is 100% better than that of electrodes prepared by standard thermal decomposition.

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Section: Sem and Eds Analysis Of The Ruo 2 -Ta 2 O 5 Electrodessupporting

confidence: 81%

Section: Accelerated Life Test (Alt)supporting

confidence: 73%

Morphological and electrochemical investigation of RuO2–Ta2O5 oxide films prepared by the Pechini–Adams method

2008

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“…53 n-values smaller than 1.0 can be attributed to the porosity and the roughness of the metal oxide coating that leads to a non-uniform current distribution on the electrode. 21,51,52 Nevertheless, the values of n close to 1.0, i.e., 0.92-0.96, show that the microscopic and sub-microscopic roughness of the surface is small. These values are rather different from those reported by Hoseinieh et al 20,21 who tested coatings with very similar composition to the ternary metal oxide-composition IrO 2 -TiO 2 -RuO 2 used in this work; these authors found values of n around 0.60 for new anodes and around 0.92 for used electrodes.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 96%

“…CPE have often been used to fit the impedance of DSA anodes due to the roughness and porosity of the applied coating. 21,51,52 The impedance of the CPE, Z CPE , is given as follows:…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Electrochemical cell design for the impedance studies of chlorine evolution at DSA® anodes

Silva

Dias

Araújo

et al. 2016

Review of Scientific Instruments

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A new electrochemical cell design suitable for the electrochemical impedance spectroscopy (EIS) studies of chlorine evolution on Dimensionally Stable Anodes (DSA ® ) has been developed. Despite being considered a powerful tool, EIS has rarely been used to study the kinetics of chlorine evolution at DSA anodes. Cell designs in the open literature are unsuitable for the EIS analysis at high DSA anode current densities for chlorine evolution because they allow gas accumulation at the electrode surface. Using the new cell, the impedance spectra of the DSA anode during chlorine evolution at high sodium chloride concentration (5 mol dm −3 NaCl) and high current densities (up to 140 mA cm −2 ) were recorded. Additionally, polarization curves and voltammograms were obtained showing little or no noise. EIS and polarization curves evidence the role of the adsorption step in the chlorine evolution reaction, compatible with the Volmer-Heyrovsky and Volmer-Tafel mechanisms. Published by AIP Publishing. [http://dx

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“…10 as a Bode plot. A high frequency peak for the failed sample is observed which provides an indication of the formation of a passive layer presumably TiO 2 [40,41]. Table 3 summarizes all the electrochemical, physical and stability measurements of the coated titanium samples tested.…”

Section: Stabilitymentioning

confidence: 99%

Wet film application techniques and their effects on the stability of RuO2–TiO2 coated titanium anodes

Shrivastava

Moats

2008

J Appl Electrochem

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The effect of wet film application techniques on the physical and electrochemical properties and operational stability of RuO 2 -TiO 2 coated titanium anodes was evaluated. Four compositions of RuO 2 -TiO 2 coatings were applied to Ti substrates by three different wet coating methods-brush, dip and spin. Changing the coating technique resulted in different morphologies. Electrochemically active surface area of the coatings was related to the morphology. A shift in Ru(III)/Ru(IV) oxidation potential occurred upon changing the application technique. For lower ruthenium content coatings, this shift was related to coating lifetime. Anode stability in accelerated lifetesting showed that dip coated samples lasted up to three times longer than brush coated samples for lower ruthenium content.

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Investigation of the electrical properties, charging process, and passivation of RuO2–Ta2O5 oxide films

Cited by 30 publications

References 52 publications

Morphological and electrochemical investigation of RuO2–Ta2O5 oxide films prepared by the Pechini–Adams method

Morphological and electrochemical investigation of RuO2–Ta2O5 oxide films prepared by the Pechini–Adams method

Electrochemical cell design for the impedance studies of chlorine evolution at DSA® anodes

Wet film application techniques and their effects on the stability of RuO2–TiO2 coated titanium anodes

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