Electrocatalytic oxidation of oxalic and oxamic acids in aqueous media at carbon nanotube modified electrodes

Ferreira, M.; Pinto, Mara F.; Soares, O.S.G.P.; Pereira, M.F.R.; Órfão, J.J.M.; Figueiredo, José; Neves, Isabel C.; Fonseca, A.; Parpot, Píer

doi:10.1016/j.electacta.2011.11.046

Cited by 20 publications

(9 citation statements)

References 26 publications

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“…Pinizza et al also studied the electrochemical oxidation of OA at different electrode materials [17]. Ferreia et al investigated the electrocatalytic oxidation of OA in aqueous media at carbon nanotube-modified electrode loaded with monometallic or bimetallic catalysts [18]. However, electrochemical oxidation of OA requires high overpotential and electrochemical performances are highly dependent on the electrode interface or the pretreatment of the carbon material.…”

Section: Introductionmentioning

confidence: 98%

Sensitive electrochemical determination of oxalic acid in spinach samples by a graphene-modified carbon ionic liquid electrode

Cheng

You

Sha³

et al. 2014

Ionics

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In this paper, a new electrochemical oxalic acid (OA) sensor based on graphene (GR)-modified carbon ionic liquid electrode (CILE) was proposed. The GR nanosheets were deposited on the surface of CILE by electroreduction with graphene oxide as precursor and electrocatalytic oxidation of OA on GR/CILE was further investigated. As compared with that of bare CILE, the oxidation peak current of OA on GR/CILE were greatly improved with the decrease of the oxidation potential. Electrochemical parameters of the electrooxidation of OA were calculated. Under the selected conditions, the oxidation peak currents increased with OA concentration in the range from 8.0 μM to 6.0 mM with the detection limit as 0.48 μM (3σ). The proposed method exhibited higher sensitivity and wider linear range, which was applied to determination of OA concentration in spinach samples with satisfactory results.

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Section: Introductionmentioning

confidence: 98%

Sensitive electrochemical determination of oxalic acid in spinach samples by a graphene-modified carbon ionic liquid electrode

Cheng

You

Sha³

et al. 2014

Ionics

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“…The activation energy was calculated from the study of the temperature effect on the rate constant (Arrhenius' law), considering that the activation energy range of a typical diffusion-controlled process is less than 20 kJ/mol [30]. Fig.…”

Section: Effect Of Temperature On Oa Removal and Reaction Kineticsmentioning

confidence: 99%

A Kinetic Study of Oxalic Acid Electrochemical Oxidation on a Manganese Dioxide Rotating Cylinder Anode

Abbar¹,

Abbas²

2018

Port. Electrochim. Acta

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This paper deals with the theory and kinetics of oxalic acid electrochemical oxidation, in an acidic solution containing sodium chloride, using a manganese dioxide rotating cylinder anode. Voltammetric and galvanostatic electrolysis techniques were used. The voltametric study shows a higher anodic wave corresponding to chlorine oxidation on the MnO2 electrode, prevailing oxalic acid indirect oxidation. Galvanostatic electrolysis studies confirmed that the rate constant is affected by chloride concentration, current density, agitation and temperature. Electrochemical oxidation rate was found to be a pseudo-first order kinetic process. A strongly linear relationship between the rate constant and chloride concentration was observed, while polynomial relations, with respect to current density and temperature, were found. The activation energy was found to be 14.541 kJ/mol, which suggests a diffusion control kinetic step in oxalic acid degradation. The findings of the present research validate that oxalic acid incineration can be successfully carried out on a MnO2 anode, in NaCl presence.

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“…[16][17][18] Metallic catalysts, such as gold, platinum, and palladium are usually explored. 16,19,20 While platinum performs better at oxidizing oxalate than other mono-metallic materials, it is a precious metal and fairly expensive to be used as a bulk catalyst. pH dependence of the platinum's activity creates an additional downside because it limits the metal's ability to oxidize OA in non-alkaline media at potentials higher than ∼1.1 V vs Ag/AgCl.…”

mentioning

confidence: 99%

Evaluation of Pt Alloys as Electrocatalysts for Oxalic Acid Oxidation: A Combined Experimental and Computational Study

Perry

Babanova

Matanović

et al. 2016

J. Electrochem. Soc.

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In this study we combined experimental approaches and density functional theory to evaluate novel platinum-based materials as electrocatalysts for oxalic acid oxidation. Several Pt alloys, PtSn (1:1), PtSn (19:1), PtRu (1:4), PtRuSn (5:4:1), and PtRhSn (3:1:4), were synthetized using sacrificial support method and tested for oxidation of oxalic acid at pH 4. It was shown that PtSn (1:1) and PtRu (1:4) have higher mass activity relative to Pt. These two materials along with Pt and one of the least active alloys, PtSn (19:1), were further analyzed for the oxidation of oxalic acid at different pHs. The results show that all samples tested followed an identical trend of decreased onset potential with increased pH and increased catalytic activity with decreased pH. Density functional theory was further utilized to gain a fundamental knowledge about the mechanism of oxalic acid oxidation on Pt, PtSn (1:1), and PtRu (1:4). The results of the calculations along with the experimentally observed dependence of generated currents on the oxalic acid concentration indicate that the mechanism of oxalic acid oxidation on Pt proceeds without the participation of surface oxidizing species, while on Pt alloys it involves their participation.

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Electrocatalytic oxidation of oxalic and oxamic acids in aqueous media at carbon nanotube modified electrodes

Cited by 20 publications

References 26 publications

Sensitive electrochemical determination of oxalic acid in spinach samples by a graphene-modified carbon ionic liquid electrode

Sensitive electrochemical determination of oxalic acid in spinach samples by a graphene-modified carbon ionic liquid electrode

A Kinetic Study of Oxalic Acid Electrochemical Oxidation on a Manganese Dioxide Rotating Cylinder Anode

Evaluation of Pt Alloys as Electrocatalysts for Oxalic Acid Oxidation: A Combined Experimental and Computational Study

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