Electrocatalysis of the oxidation of alcohol and phenol derivative pollutants at vitreous carbon electrode coated by nickel macrocyclic complex-based films

Rocha, Juan Manríquez; Bravo, José; Gutiérrez-Granados, Silvia; Succar, S. Sucar; Ordaz, Alejandro Alatorre; Bedioui, Féthi

doi:10.1016/s0003-2670(98)00564-9

Cited by 71 publications

(41 citation statements)

References 23 publications

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“…The low current of these peaks could be due to two factors: less amount of borohydride ions near the electrode surface after the oxidation scan, or adsorption of the oxidation products of borohydride such as borohydroxide or oxide intermediates on the silver catalyst that could block the active sites. This behaviour is similar to the oxidation of alcohols observed on Ni electrodes by Manriquez et al (41) where an adsorption step is involved in the oxidation mechanism. The slight shift of the potential peak towards negative values with the number of cycles might be an indication that more silver oxide is formed and favors the borohydride oxidation.…”

Section: The Oxidation Of Borohydride Ion On Silver In Alkaline Electsupporting

confidence: 88%

Oxidation of the Borohydride Ion at Silver Nanoparticles on a Glassy Carbon Electrode (GCE) Using Pulsed Potential Techniques

Hernández-Ramírez¹,

Alatorre-Ordaz²,

Yépez-Murrieta³

et al. 2009

ECS Trans.

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Direct oxidation borohydride fuel cells are very attractive energy conversion devices. Silver has been reported as one of the few materials which can catalyze an 8-electron oxidation. Potential step amperometric pulse techniques to synthesize nanostructured silver material on flat glassy carbon electrodes is reported and significant differences with bulk silver deposit have been observed. The oxidation of borohydride ion on the silver particles occurs at -0.025 V vs. SCE and the potential decreases towards negative values at longer cycle times. The oxidation current also decreases with the number of cycles, suggesting that the silver active sites become partially blocked by oxidation products of borohydride. The electroactive area per unit electrode area of silver was relatively low for particles deposited using potential step amperometric techniques on glassy carbon (0.002 cm2 per cm-2) compared with the area found at a polycrystalline silver electrode (0.103 cm2 per cm-2).

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Section: The Oxidation Of Borohydride Ion On Silver In Alkaline Electsupporting

confidence: 88%

Oxidation of the Borohydride Ion at Silver Nanoparticles on a Glassy Carbon Electrode (GCE) Using Pulsed Potential Techniques

Hernández-Ramírez¹,

Alatorre-Ordaz²,

Yépez-Murrieta³

et al. 2009

ECS Trans.

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“…This type of electrode modification allows the electrocatalyst to be dispersed at the molecular level with good activity towards many electrocatalytic reactions [7 -28]. Complexes of nickel, in a square-planar arrangement, show a high catalytic activity towards the oxidation of several compounds like H 2 O 2 [14,15], methanol [16,17,18], other simple alcohols [19,26], ascorbic acid [20], derivatives of phenol [10], formaldehyde [21], glucose [23,24], hydrazine [25] and others [22]. Other nickel based CMEs were also used in the electrocatalytic oxidations of alcohols and glycine [22,27,28].…”

Section: Introductionmentioning

confidence: 99%

“…The calculation was based on the charge under the poly(Ni II ) to poly(Ni III ) oxidation curve of the modified electrodes [10]. At all the modified electrodes an approximate monolayer surface coverage of poly(Ni) is formed.…”

mentioning

confidence: 99%

Influence of Metal Nanoparticles on the Electrocatalytic Oxidation of Glucose by Poly(Ni^IIteta) Modified Electrodes

Azad

Ganesan

2010

Electroanalysis

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Conductive polymeric [Ni II (teta)] 2þ (teta ¼ C-meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetra-azacyclotetradecane) films (poly(Ni)) have been deposited on the surface of glassy carbon (GC), Nafion (Nf) modified GC (GC/Nf) and Nf stabilized Ag and Au nanoparticles (NPs) modified GC (GC/Ag-Nf and GC/Au-Nf) electrodes. The cyclic voltammogram of the resulting electrodes, show a well defined redox peak due to oxidation and reduction of poly(Ni) system in 0.1 M NaOH. They show electrocatalytic activity towards the oxidation of glucose. AFM studies reveal the formation of poly(Ni) film on the modified electrodes. Presence of metal NPs increases electron transfer rate and electrocatalytic oxidation current by improving the communication within the Nf and poly(Ni) films. In the presence of metal NPs, 4 fold increase in current for glucose oxidation was observed.

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“…23 Additionally, porphyrins and metalloporphyrins have demonstrated good features as analytical sensors because they can provoke electrocatalysis, increasing the sensitivity and selectivity of the electrode. [24][25][26][27] In this context, the present work reports the development of an efficient and stable sensor for oncocalyxone A (1) determination, based on a glassy carbon electrode modification with a bilayer produced by drop-casting of iron(II) tetrasulfonated phthalocyanine (negatively charged) and iron(III) tetra-(N-methyl-4-pyridyl)-porphyrin (positively charged), where presumably a strong interaction is established by ion-pair formation between the ammonium group of the porphyrin and the sulfonic (-SO 3 -) group of the phthalocyanine. …”

mentioning

confidence: 99%

Electrochemical determination of oncocalyxone A using an iron-phthalocyanine/iron-porphyrin modified glassy carbon electrode

Costa¹,

Souza²,

Luz³

et al. 2008

J. Braz. Chem. Soc.

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Descreve-se, no presente trabalho, o desenvolvimento de um sensor voltamétrico altamente sensível para a oncocalixona A, utilizando-se eletrodo de carbono vítreo modificado com uma bicamada de ftalocianina tetrassulfonada de ferro(II) (FeTSPc) e tetra-(N-metil-4-piridil)-porfirina de ferro(III) (FeT 4 MPyP). O eletrodo modificado apresentou alta atividade catalítica e estabilidade em relação à redução da oncocalixona, proporcionando deslocamento anódico de ca. de 30 mV e amplificação da corrente de pico, em relação a iguais parâmetros obtidos em eletrodo de carbono vítreo não modificado. Um ampla faixa linear de resposta entre 0.005-1.2 µmol L -1 , com sensibilidade de 8.11 µA L µmol -1 e limites de detecção (LOD) e quantificação (LOQ) de 1.5 e 5 nmol L -1 foram obtidos, com o uso desse sensor.The development of a highly sensitive voltammetric sensor for oncocalyxone A using a glassy carbon electrode modified with a bilayer iron(II) tetrasulfonated phthalocyanine (FeTSPc) and iron(III) tetra-(N-methyl-4-pyridyl)-porphyrin (FeT 4 MPyP) is described. The modified electrode showed high catalytic activity and stability for the oncocalyxone A reduction, provoking the anodic shift of the reduction peak potentials of ca. 30 mV and presenting much higher peak currents than those obtained on the bare GC electrode. A wide linear response range between 0.005-1.2 µmol L -1 , with a sensitivity of 8.11 µA L µmol -1 and limits of detection (LOD) and quantification (LOQ) of 1.5 and 5 nmol L -1 were obtained with this sensor.Keywords: voltammetric sensor, oncocalyxone, quinone, chemically modified electrodes, catalysis IntroductionPlants are repositories for bioactive organic molecules. Several classes of natural compounds are pharmacologically active ingredients and serve as drugs and/or leads for drug developments. Among them, quinones, ubiquitous secondary metabolites, play essential roles, mainly in the biochemistry of energy production, serving as vital links in the electron transport. 1 They form an important class of toxic metabolites and paradoxically, can be either, potentially carcinogenic or effective anticancer agents. The cytotoxic activity of quinones can often be correlated to their chemical behavior. The striking feature of quinone chemistry is the ease reduction and therefore their ability to act as oxidizing or dehydrogenating agents, the driving force being the formation of a fully aromatic system. [2][3][4][5] Auxemma oncocalyx Taub. is a native Brazilian tree, characteristic of the xerophytic vegetation present in the northeastern region. It is commonly called "pau branco." The chemical investigation of A. oncocalyx heartwood extracts resulted in the isolation and characterization of several unusual terpenoid quinones and hydroquinones of C 16 framework. 6-9 These secondary metabolites seem to be typical of the genus and, interestingly, were isolated in a homolog series differing in their degree of oxidation, oxygenation (ether or alcohol), rearrangement and intramolecular cyclization of the terpenoid side ...

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Electrocatalysis of the oxidation of alcohol and phenol derivative pollutants at vitreous carbon electrode coated by nickel macrocyclic complex-based films

Cited by 71 publications

References 23 publications

Oxidation of the Borohydride Ion at Silver Nanoparticles on a Glassy Carbon Electrode (GCE) Using Pulsed Potential Techniques

Oxidation of the Borohydride Ion at Silver Nanoparticles on a Glassy Carbon Electrode (GCE) Using Pulsed Potential Techniques

Influence of Metal Nanoparticles on the Electrocatalytic Oxidation of Glucose by Poly(Ni^IIteta) Modified Electrodes

Electrochemical determination of oncocalyxone A using an iron-phthalocyanine/iron-porphyrin modified glassy carbon electrode

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Electrocatalysis of the oxidation of alcohol and phenol derivative pollutants at vitreous carbon electrode coated by nickel macrocyclic complex-based films

Cited by 71 publications

References 23 publications

Oxidation of the Borohydride Ion at Silver Nanoparticles on a Glassy Carbon Electrode (GCE) Using Pulsed Potential Techniques

Oxidation of the Borohydride Ion at Silver Nanoparticles on a Glassy Carbon Electrode (GCE) Using Pulsed Potential Techniques

Influence of Metal Nanoparticles on the Electrocatalytic Oxidation of Glucose by Poly(NiIIteta) Modified Electrodes

Electrochemical determination of oncocalyxone A using an iron-phthalocyanine/iron-porphyrin modified glassy carbon electrode

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Influence of Metal Nanoparticles on the Electrocatalytic Oxidation of Glucose by Poly(Ni^IIteta) Modified Electrodes