Preparation and characterization of Ti/SnO2-Sb electrode by Pechini's method for phenol oxidation

Santos, Iranildes Daniel dos; Gabriel, Sinara Borborema; Afonso, Júlio Carlos; Dutra, Achilles Junqueira Bourdot

doi:10.1590/s1516-14392011005000054

Cited by 26 publications

(16 citation statements)

References 37 publications

(61 reference statements)

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“…Baker), tin citrate (C 6 H 4 O 7 Sn 2 , home-made), antimony potassium tartrate (K 2 Sb 2 (C 4 H 2 O 6 ) 2 , J.T. Baker), according to the strategy proposed by Iranildes et al 25 A final thermal treatment at a 550 • C during 1 h was applied to this oxide with the aim of inhibiting the TiO 2 formation.…”

Section: Methodsmentioning

confidence: 99%

“…simplex method) of the sum-of-squares error between the model predictions and data defined by the following fitness function: [25] where n is the number of data points, Z model r and Z ex perimental r are the model-predicted and experimental real components of impedance, respectively, and Z ima are their respective values for the imaginary component. A genetic algorithm as implemented in the toolbox of Matlab was also used as minimization method to increase the probabilities of reaching global minima (Eq.…”

Section: Model Fittingmentioning

confidence: 99%

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The Kinetic Parameters of the Oxygen Evolution Reaction (OER) Calculated on Inactive Anodes via EIS Transfer Functions:^•OH Formation

García-Osorio

Jaimes

Vazquez‐Arenas

et al. 2017

J. Electrochem. Soc.

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The electrocatalytic behavior of "inactive" (Boron Doped Diamond (BDD), SnO 2 -Sb and PbO 2 ) anodes toward the oxygen evolution reaction (OER) is evaluated using dc and ac techniques, under controlled experimental conditions (e.g. air bubbling, ohmic drop correction). Tafel slopes estimated from anodic polarization curves for all catalysts are located above 100 mV dec −1 , suggesting that the rate-controlling step is similar for these materials at determined overpotentials. In agreement with the literature, it could be associated with the • OH generation since "active catalysts" displays slopes below 80 mV dec −1 . A transfer function model is derived to account for the kinetic parameters of the OER mechanism for each anode, throughout its fitting to experimental electrochemical impedance spectroscopy (EIS) spectra. The model considers the kinetics of each elementary reaction and the material balances for the rates of formation of the adsorbates (H 2 O ads , • OH ads , • O ads , • OOH ads , and O 2ads ) involved in the OER. It is found that the rate-controlling step on SnO 2 -Sb (≤2.14 V), PbO 2 (≤1.74 V) and BDD (2.54-2.71 V) is associated with the • OH formation, while this control is only modified when the potential becomes more positive for the oxide catalysts, thus, being determined by the production of adsorbed oxygen O 2ads which on its turn promotes the O 2 evolution. On the other hand, the rate-control step remains similar for BDD over the entire analyzed potential range, standing out its unique properties as inactive catalyst of the OER. In the last decades, the OER mechanism has turned out be of significant importance for environmental applications related to wastewater treatment, particularly those involving the destruction of toxic and/or recalcitrant organic compounds, using "inactive" catalysts.1-9 Under this context, active anodes contain transition elements on their surfaces with intermediate oxidations states, which enhance the OER and the partial oxidation of the contaminants; while inactive anodes favor the mineralization of the organic compounds throughout an indirect mechanism involving a strong oxidizing mediator (• OH radicals).10 Concerning inactivity, the boron doped diamond (BDD) is the state-of-the-art catalyst, since it possesses a unique role toward the formation of hydroxyl radicals.11-14 Nevertheless, overcoming its inherent high cost and manageability remain as main challenges to achieve an adequate operation at industrial levels. An intense research combining the best characteristics to electrochemically enhance • OH formation has resulted in the proposal of materials containing PbO 2 (β phase) and SnO 2 , with multiple variations during synthesis conditions. [1][2][3]12,[15][16][17] However, although the applications of these catalysts have been successful toward the electrocombustion of different organic compounds, their fundamental chemistry, rate-controlling steps and interactions occurring during the occurrence of• OH generation have not been fully understood. Most computa...

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Section: Methodsmentioning

confidence: 99%

Section: Model Fittingmentioning

confidence: 99%

The Kinetic Parameters of the Oxygen Evolution Reaction (OER) Calculated on Inactive Anodes via EIS Transfer Functions:^•OH Formation

García-Osorio

Jaimes

Vazquez‐Arenas

et al. 2017

J. Electrochem. Soc.

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“…Therefore, poor mass transfer was also aggravated by fouling the electrode with degradation products of MB leading to the formation of organic films on the electrode surface, as is frequently the case for MMO [34,35].…”

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confidence: 99%

Novel Ti/Ta2O5-SnO2 electrodes for water electrolysis and electrocatalytic oxidation of organics

Shestakova

Bonete

Gómez

et al. 2014

Electrochimica Acta

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Please cite this article as: M. Shestakova, P. Bonete, R. Gómez, M.S. , Walter Z. Tang, Novel Ti/Ta 2 O 5 -SnO 2 electrodes for water electrolysis and electrocatalytic oxidation of organics, Electrochimica Acta (2014), http://dx.doi. org/10.1016/j.electacta.2013.12.113 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…24,25 The metal : citric acid (CA) : ethylene glycol (EG) mole ratio was 1 : 3 : 10. The preparation procedure was similar to our previous report and other reports.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…25 3.1.2 Analysis on phase transformation of the containing Er precursor. The suitable calcination temperature could obtain a better crystallinity of SnO 2 grain, a higher order degree in the atomic lattice of the SnO 2 lattice, and reduce the oxygen vacancy defect in the crystal.…”

Section: Characterization Of the Precursormentioning

confidence: 99%

Electro-catalytic degradation pathway and mechanism of acetamiprid using an Er doped Ti/SnO₂–Sb electrode

Zeng

et al. 2015

RSC Adv.

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Acetamiprid, a type of new neonicotinoid pesticide, shows a high threat to water systems. Electro-catalytic degradation of acetamiprid was evaluated using an Er doped Ti/SnO 2 -Sb electrode prepared by the Pechini method. The acetamiprid degradation obeys first order reaction kinetics and is controlled by mass transport and oxygen evolution. TOC removal efficiency and UV scan curves revealed that some intermediate products were produced by the Er doped Ti/SnO 2 -Sb electrode. Through electrospray ionization quadrupole time-of-flight tandem mass spectrometry, the ion mass-to-charge ratio of intermediate products was determined. Combining the experimental results, a degradation pathway was proposed for the electro-catalytic degradation of acetamiprid. Electrodes were mainly characterized by linear sweep voltammetry and cyclic voltammetry. The acetamiprid and TOC concentrations were reduced to 87.45% and 69.31%, respectively, after 180 min of electrolysis at 10 mA cm À2 .

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Preparation and characterization of Ti/SnO2-Sb electrode by Pechini's method for phenol oxidation

Cited by 26 publications

References 37 publications

The Kinetic Parameters of the Oxygen Evolution Reaction (OER) Calculated on Inactive Anodes via EIS Transfer Functions:^•OH Formation

The Kinetic Parameters of the Oxygen Evolution Reaction (OER) Calculated on Inactive Anodes via EIS Transfer Functions:^•OH Formation

Novel Ti/Ta2O5-SnO2 electrodes for water electrolysis and electrocatalytic oxidation of organics

Electro-catalytic degradation pathway and mechanism of acetamiprid using an Er doped Ti/SnO₂–Sb electrode

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Preparation and characterization of Ti/SnO2-Sb electrode by Pechini's method for phenol oxidation

Cited by 26 publications

References 37 publications

The Kinetic Parameters of the Oxygen Evolution Reaction (OER) Calculated on Inactive Anodes via EIS Transfer Functions:•OH Formation

The Kinetic Parameters of the Oxygen Evolution Reaction (OER) Calculated on Inactive Anodes via EIS Transfer Functions:•OH Formation

Novel Ti/Ta2O5-SnO2 electrodes for water electrolysis and electrocatalytic oxidation of organics

Electro-catalytic degradation pathway and mechanism of acetamiprid using an Er doped Ti/SnO2–Sb electrode

Contact Info

Product

Resources

About

The Kinetic Parameters of the Oxygen Evolution Reaction (OER) Calculated on Inactive Anodes via EIS Transfer Functions:^•OH Formation

The Kinetic Parameters of the Oxygen Evolution Reaction (OER) Calculated on Inactive Anodes via EIS Transfer Functions:^•OH Formation

Electro-catalytic degradation pathway and mechanism of acetamiprid using an Er doped Ti/SnO₂–Sb electrode