The influence of the synthesis method of Ti/RuO2 electrodes on their stability and catalytic activity for electrochemical oxidation of the pesticide carbaryl

Santos, Tarciso Éder Santana Santos Santana Santana; Silva, Ronaldo S.; Jara, C. Carlesi; Eguiluz, Katlin Ivon Barrios; Salazar‐Banda, Giancarlo R.

doi:10.1016/j.matchemphys.2014.07.007

Cited by 33 publications

(8 citation statements)

References 23 publications

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“…Note the presence of cracks on the anode surfaces, which are attributed to the mechanical stress resulted from the plasticity of the coating and the difference of the thermal expansion coefficients between the substrate and the film. This "cracked-mud" appearance has been commonly reported for coatings deposited by using thermal decomposition[24,38,39]. Additionally, for both methods, as the temperature increases the surface becomes smoother.…”

supporting

confidence: 66%

Improvement of Ti/RuO2–IrO2 Anode Lifetime and Electrocatalytical Properties by Using an Eco-Friendly Thermal Decomposition Method Using Polyvinyl Alcohol as Solvent

Bezerra¹,

Santos²,

Pupo³

et al. 2019

Preprint

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Electrochemical oxidation processes are promising solutions for wastewater treatment due to their high efficiency, easy control and versatility. Mixed metal oxides (MMO) anodes are particularly attractive due to their low cost and specific catalytic properties. Here, we propose an innovative thermal decomposition methodology using <a>polyvinyl alcohol (PVA)</a> as a solvent to prepare Ti/RuO2–IrO2 anodes. Comparative anodes were prepared by conventional method employing a polymeric precursor solvent (Pechini method). The calcination temperatures studied were 300, 400 and 500 °C. The physical characterisation of all materials was performed by X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy, while electrochemical characterisation was done by cyclic voltammetry, accelerated service lifetime and electrochemical impedance spectroscopy. Both RuO2 and IrO2 have rutile-type structures for all anodes. Rougher and more compact surfaces are formed for the anodes prepared using PVA. Amongst temperatures studied, 300 °C using PVA as solvent is the most suitable one to produce anodes with expressive increase in voltammetric charge (250%) and accelerated service lifetime (4.3 times longer) besides reducing charge-transfer resistance (8 times lower). Moreover, the electrocatalytic activity of the anodes synthesised with PVA toward the Reactive Blue 21 dye removal in chloride medium (100 % in 30 min) is higher than that prepared by Pechini method (60 min). Additionally, the removal total organic carbon point out improved mineralisation potential of PVA anodes. Finally, this study reports a novel methodology using PVA as solvent to synthesise Ti/RuO2–IrO2 anodes with improved properties that can be further extended to synthesise other MMO compositions.

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supporting

confidence: 66%

Improvement of Ti/RuO2–IrO2 Anode Lifetime and Electrocatalytical Properties by Using an Eco-Friendly Thermal Decomposition Method Using Polyvinyl Alcohol as Solvent

Bezerra¹,

Santos²,

Pupo³

et al. 2019

Preprint

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“…Dimensionally stable anodes (DSA ® ) were developed by Beer in the late 1960s. Although their primary application has been recognized in the chlor-alkali industry [1], they are widely used for the degradation of persistent organic pollutants (POPs) in water [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. These works highlighted that mixed metal oxides (MMO) supported on either titanium or niobium substrates represent one of the most important categories of electrocatalysts [4][5][6][7][8][9][10][11][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The preparation of an ideal MMO electrode must guarantee its high oxidation ability, chemical and mechanical stability based on an adequate service life, and low cost. Worth mentioning, the use of MMO for POPs degradation has only been performed at small scale due to limitations from short service life and passivation, which has impeded its industrial application so far [3,12,19].…”

Section: Introductionmentioning

confidence: 99%

Ti|Ir–Sn–Sb oxide anode: Service life and role of the acid sites content during water oxidation to hydroxyl radicals

Aguilar

Coreño

Salazar

et al. 2018

Journal of Electroanalytical Chemistry

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This work describes the preparation of four Ti|Ir-Sn-Sb oxide anodes by the Pechini method under different conditions and the evaluation of their service life, envisaging a future application in electrochemical advanced oxidation processes for water treatment. This was estimated by means of accelerated life tests (1 A cm-2 , 1 M HClO4), which highlighted the dependence of durability on the Ir and Sn content in the mixed metal oxide (MMO) as well as on the required heat treatment time for its preparation. The best MMO anode reached up to 351 h of service life under such extreme conditions. SEM-EDS and XRD analyses were performed before and after the accelerated life tests, evidencing that the failure of the MMO coatings occurred by detachment from the titanium substrate, thus losing the anode electroactivity. Great amounts of acid sites in the range 0.21-0.26 meq g-1 were determined on the MMO surfaces by Boehm titrations. From the apparent rate constants determined for the decay of N,N-dimethyl-4-nitrosoaniline used as spin trap, before and after acid sites neutralization, a higher activity of adsorbed hydroxyl radicals at the MMO surface cannot be correlated with a greater amount of acid sites. The results obtained suggest that other active sites affect the formation of such radicals from water discharge.

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“…The Pechini method has received increasing attention because it allows the synthesis of materials at relatively low temperatures and with controlled characteristics (composition and homogeneity) [2]. However, a new method to produce DSA using an ionic liquid as metallic chlorides solvent for further thermal decomposition (named as 'IL method') allows the DSA to be synthesized by a simple and rapid route and may reduce the cost and time required for the production of these materials [3,4]. The Ti/RuO 2 electrodes prepared by this method have shown high stability and high catalytic activity towards pesticide carbaril oxidation in aqueous media [3].…”

Section: Introductionmentioning

confidence: 99%

Development of Ti/(RuO2)0.8(MO2)0.2 (M=Ce, Sn or Ir) anodes for atrazine electro-oxidation. Influence of the synthesis method

et al. 2015

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The influence of the synthesis method of Ti/RuO2 electrodes on their stability and catalytic activity for electrochemical oxidation of the pesticide carbaryl

Cited by 33 publications

References 23 publications

Improvement of Ti/RuO2–IrO2 Anode Lifetime and Electrocatalytical Properties by Using an Eco-Friendly Thermal Decomposition Method Using Polyvinyl Alcohol as Solvent

Improvement of Ti/RuO2–IrO2 Anode Lifetime and Electrocatalytical Properties by Using an Eco-Friendly Thermal Decomposition Method Using Polyvinyl Alcohol as Solvent

Ti|Ir–Sn–Sb oxide anode: Service life and role of the acid sites content during water oxidation to hydroxyl radicals

Development of Ti/(RuO2)0.8(MO2)0.2 (M=Ce, Sn or Ir) anodes for atrazine electro-oxidation. Influence of the synthesis method

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