Green processes for environmental application. Electrochemical ozone production

Silva, Leonardo M. Da; Faria, Luiz A. De; Boodts, Julien Françoise Coleta

doi:10.1351/pac200173121871

Cited by 86 publications

(127 citation statements)

References 27 publications

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“…Da Silva et al [196][197][198][199][200] emphasize that in addition to the composition of the PbO 2 used for ozone generation, the electrode morphology (e.g. porosity, roughness) also strongly influences ozone generation kinetics and current efficiency.…”

Section: The Generation Of Ozonementioning

confidence: 99%

Electrodeposited lead dioxide coatings

2011

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Lead dioxide coatings on inert substrates such as titanium and carbon now offer new opportunities for a material known for 150 years. It is now recognised that electrodeposition allows the preparation of stable coatings with different phase structures and a wide range of surface morphologies. In addition, substantial modification to the physical properties and catalytic activities of the coatings are possible through doping and the fabrication of nanostructured deposits or composites. In addition to applications as a cheap anode material in electrochemical technology, lead dioxide coatings provide unique possibilities for probing the dependence of catalytic activity on layer composition and structure (critical review, 256 references).

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Section: The Generation Of Ozonementioning

confidence: 99%

Electrodeposited lead dioxide coatings

2011

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“…17,[24][25][26] These investigations also show that for this kind of electrode material the main contribution to the total resistance of the system comes from the solution resistance between the working electrode and the Luggin capillary.…”

Section: Tafel Linesmentioning

confidence: 68%

Chlorine evolution reaction at Ti/(RuO2+Co3O4) electrodes

Silva¹,

Boodts²,

Faria³

2003

J. Braz. Chem. Soc.

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A investigação do mecanismo eletródico e das propriedades eletrocatalíticas da reação de desprendimento de cloro, RDCl, foi executada em eletrodos mistos de óxido do tipo rutila e espinélio de composição nominal Ti/[RuO 2 (x)+Co 3 O 4 (1-x)]. Os eletrodos foram preparados por decomposição térmica (T calc. = 470 o C; t calc. = 1h), com x variando entre 0 e 1 mudado em intervalos de 0,1. O estudo cinético foi executado registrando-se curvas corrente-potencial e pela determinação da ordem de reação com respeito aos íons H + e Cl -. Um valor constante do coeficiente de Tafel de 33 mV foi obtido para concentrações de RuO 2 entre 0-80% mol, aumentando para 40 mV para concentrações superiores de RuO 2 . Os dados experimentais apoiam o mecanismo de Erenburg e cols. para a RDCl. Um único mecanismo explica os resultados experimentais assumindo que o efeito "edge" influencie os valores do coeficiente de transferência eletrônica. A análise da atividade eletrocatalítica mostra que misturas de óxidos aumentam a atividade eletrocatalítica aparente.A systematic investigation of the mechanistic and electrocatalytic properties of the chlorine evolution reaction, ClER, on mixed rutile/spinel oxides of nominal composition Ti/ [RuO 2 (x)+Co 3 O 4 (1-x)] was done. Electrodes were prepared using the thermal decomposition procedure (T calc. = 470 o C; t calc. = 1h), with x varied between 0 and 1, changed in 0.1 steps. Kinetics were studied recording quasi-stationary current-potential curves and reaction order determined with respect to H + and Cl -. A constant Tafel slope of about 33 mV was found for the 0 -80 mol% RuO 2 concentration interval, increasing to 40 mV for higher RuO 2 contents. Experimental data support the mechanism originally proposed by Erenburg et al. for the ClER. The edge effect exerts an influence on the electronic transfer coefficient values. Analysis of the electrocatalytic activity reveals an increase in the apparent electrocatalytic activity for the mixed oxides.Keywords: cobalt, ruthenium, chlorine evolution, electrocatalytic activity IntroductionInvestigations of the chlorine evolution reaction, ClER, reveal this reaction is an "easy" one (low overpotential) characterised by a close to theoretical Tafel coefficient (30-40 mV). [1][2][3][4] Normally the ClER does not show a significant dependence on the nature of the electrode material. 1 However, the electrode kinetics can present a dependence on such parameters as the electrode morphology (e.g. roughness, porosity) and the electrolyte pH. 5 The ClER is thermodynamically unfavoured (E o = 1.36V(vs. RHE)) compared to the oxygen evolution reaction, OER, (E o = 1.23V(vs. RHE)). However, chlorine can be produced from aqueous solutions with high current efficiency, especially at the lower pH-values of the electrolyte, due to the significant overpotential displayed by most electrode materials for the OER. 6 However, OER remains a side reaction during chlorine evolution, affecting directly the purity of the Cl 2 produced. 6,7 So, electrode selectivity for the ClER re...

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“…O eletrodo de trabalho empregado, β-PbO 2 , apresenta boa estabilidade e eficiência na geração de oxigênio gasoso sob estas condições 31,[34][35][36] . Durante as eletrólises foi observado que a solução verde-escura inicial foi se alterando para verde-clara até se estabilizar na coloração azul, depois de apenas 45 min de eletrólise.…”

Section: Ensaios De Eletrofloculação Realizados Sob Condições De Poteunclassified

Aplicação da tecnologia de eletrofloculação na recuperação do corante índigo blue a partir de efluentes industriais

Paschoal¹,

Tremiliosi‐Filho²

2005

Quím. Nova

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Green processes for environmental application. Electrochemical ozone production

Cited by 86 publications

References 27 publications

Electrodeposited lead dioxide coatings

Electrodeposited lead dioxide coatings

Chlorine evolution reaction at Ti/(RuO2+Co3O4) electrodes

Aplicação da tecnologia de eletrofloculação na recuperação do corante índigo blue a partir de efluentes industriais

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