Electrochemical Promotion of Catalysis

Fóti, György; Bolzonella, Ivan; Comninellis, Christos

doi:10.1007/0-306-47927-3_4

Cited by 8 publications

(11 citation statements)

References 45 publications

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“…In this potential region, all fouling effects are avoided and a very high current efficiency is obtained. 81 It has been found that, frequently, electrochemical oxidation of certain organics in aqueous media occurs, without any loss of electrochemical activity, only at high potential values, with concomitant evolution of oxygen. 3,9,10,12,82 Furthermore, it has been found that the nature of the electrode material strongly influences both the selectivity and the efficiency of the process.…”

Section: Inner Sphere Reactions At Diamond Electrodesmentioning

confidence: 99%

Boron doped diamond electrode for the wastewater treatment

Alfaro¹,

Ferro²,

Martínez‐Huitle³

et al. 2006

J. Braz. Chem. Soc.

143

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Os estudos sobre eletroquímica do diamante iniciaram-se há mais de quinze anos, com o primeiro artigo publicado nessa área, por Pleskov. Depois disso, pesquisas começaram no Japão, Estados Unidos, França, Suíssa e outros países, sendo que nos últimos anos o número de publicações aumentou consideravelmente. Filmes de diamante têm sido o objeto de aplicações e pesquisa fundamental em eletroquímica, abrindo um novo campo conhecido como eletroquímica de eletrodos de diamante. Aqui, nós apresentamos uma breve história e o processo de síntese de filme de diamante. O principal objetivo deste trabalho é resumir os resultados mais importantes em oxidação eletroquímica, usando-se eletrodos de diamante.Electrochemical studies of diamond were started more than fifteen years ago with the first paper on diamond electrochemistry published by Pleskov. After that, work started in Japan, United States of America, France, Switzerland and other countries. Over the last few years, the number of publications has increased considerably. Diamond films have been the subject of applications and fundamental research in electrochemistry, opening up a new branch known as the electrochemistry of diamond electrodes. Here, we first present a brief history and the process of diamond film synthesis. The principal objective of this work is to summarize the most important results in the electrochemical oxidation using diamond electrodes.

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Section: Inner Sphere Reactions At Diamond Electrodesmentioning

confidence: 99%

Boron doped diamond electrode for the wastewater treatment

Alfaro¹,

Ferro²,

Martínez‐Huitle³

et al. 2006

J. Braz. Chem. Soc.

143

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“…Since its discovery [1], the non-Faradaic character of EPOC promotion has been demonstrated for more than 70 catalytic reactions, and it is now well established that EPOC is not limited to any particular class of catalysts, electrolytes or reactions [3]. The current understanding of the physicochemical origin of the phenomenon, based on numerous spectroscopic and electrochemical techniques and reviewed thoroughly [3,4], attributes the effect of electrochemical promotion to transport of ionic species through the solid electrolyte support, their discharge at the triple phase boundary (tpb) and subsequent migration of the discharged species to the catalytically active catalyst/gas interface. The discharged species act as promoters but are also consumed by the catalytic reaction and/or desorption.…”

Section: Introductionmentioning

confidence: 99%

Charge storage at Pt/YSZ interface as the origin of `permanent' electrochemical promotion of catalysis

Fóti

2009

Per. Pol. Chem. Eng.

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Tuning of the catalytic reaction rate by electric polarization of the interface between an electron conducting catalyst and an ion conducting support, called electrochemical promotion of catalysis (EPOC), is most often fully reversible. Its stateof-the-art model regards the gas-exposed catalyst surface as the unique location of charge storage via backspillover of electrochemically generated species, responsible for promotion. After long-lasting anodic polarization, a permanent effect (P-EPOC) was observed in ethylene combustion with oxygen over Pt/YSZ catalyst. Double step chronoamperometric and linear sweep voltammetric analysis revealed delayed oxygen storage, located presumably at the vicinity of the catalyst/electrolyte interface. It is proposed that oxygen stored at this location, hence hidden for the reactants and then released during relaxation, was at the origin of the observed P-EPOC. The effect of this 'hidden' promoter on the catalytic reaction rate was found to be highly non Faradaic.

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“…In previous work a generalized mechanism for the oxidation of organics in the potential region of O 2 evolution has been proposed. [5][6][7] This mechanism can explain the complete oxidation of organics to CO 2 by electrogenerated hydroxyl radicals on nonactive electrodes and the selective oxidation on active electrodes. According to this mechanism, boron-doped diamond, a nonactive electrode, is an appropriate anode for the complete oxidation of organics to CO 2 for wastewater treatment.…”

mentioning

confidence: 99%

Oxidation of 4-Chlorophenol at Boron-Doped Diamond Electrode for Wastewater Treatment

Rodrigo

Michaud

Duo

et al. 2001

J. Electrochem. Soc.

423

274

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The electrochemical behavior of synthetic boron-doped diamond thin-film electrode ͑BDD͒ has been studied in acid media containing 4-chlorophenol ͑4-CP͒ by cyclic voltammetry, chronoamperometry, and bulk electrolysis. The results have shown that in the potential region of supporting electrolyte stability occur reactions involving the oxidation of 4-CP to phenoxy radical and 1,4-benzoquinone. Polymeric materials, which result in electrode fouling, are also formed in this potential region. Electrolysis at high anodic potentials, in the region of electrolyte decomposition, complex oxidation reactions can take place involving electrogenerated hydroxyl radicals, leading to the complete incineration of 4-chlorophenol. Electrode fouling is inhibited under these conditions. The experimental results have been also compared with a theoretical model. This model is based on the assumption that the rate of the anodic oxidation of 4-CP is a fast reaction. Finally, high-pressure liquid chromatographic analyses revealed that the main intermediate products of 4-CP oxidation were 1,4-benzoquinone, maleic acid, formic acid, and oxalic acid.

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Electrochemical Promotion of Catalysis

Cited by 8 publications

References 45 publications

Boron doped diamond electrode for the wastewater treatment

Boron doped diamond electrode for the wastewater treatment

Charge storage at Pt/YSZ interface as the origin of `permanent' electrochemical promotion of catalysis

Oxidation of 4-Chlorophenol at Boron-Doped Diamond Electrode for Wastewater Treatment

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