The use of copper and cobalt phthalocyanines as electrocatalysts for the oxygen reduction reaction in acid medium

Reis, Rafael M.; Valim, Ricardo Bertholo; Rocha, Robson S.; Lima, Alex Silva; Castro, Pollyana Souza; Bertotti, Mauro; Lanza, Marcos R.V.

doi:10.1016/j.electacta.2014.07.003

Cited by 53 publications

(27 citation statements)

References 30 publications

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“…First, the system can operate at lower potentials, causing the system to consume less energy during the process. In addition, there is an increase in the selectivity of the reactions of interest, since these approach the E • potential necessary for them to occur, minimizing the chance of other species reacting in the range of applied potential [29,30].…”

Section: Catalyst Studymentioning

confidence: 99%

“…These catalysts are deposited on the surface of the working electrode so that one has an active electrode with high surface area. Therefore, much of the improvement observed in the catalytic activity of these species is due to the increase in the electrochemically active area of the electrode [29,30].…”

Section: Catalyst Studymentioning

confidence: 99%

“…In this way, the MWCN was chosen for the next studies. Electrocatalysis is a phenomenon that aims to reduce the activation energy of electrochemical reactions, causing them to proceed faster to the same overpotential [29,30].…”

Section: Catalyst Studymentioning

confidence: 99%

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Development of Electrochemical Sensor Based on Carbonaceal and Metal Phthalocyanines Materials for Determination of Ethinyl Estradiol

2019

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This work describes the development of an electrochemical sensor that was used in the determination of ethinyl estradiol (EE) in pharmaceutical formulations, river water, and milk using the square wave voltammetry technique. Studies were carried out using different carbonaceous materials (multiwalled carbon nanotubes, reduced graphene oxide Reduced graphene oxide, graphite) and different metallic phthalocyanines (cobalt, iron and manganese). Based on these studies it was possible to obtain the best system for the construction of the sensor. The device was obtained by the chemical modification of a glassy carbon electrode (GCE) with multiwalled carbon nanotubes (MWCNTs) and cobalt phthalocyanine (CoPc). The materials were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). Under conditions previously optimized for the proposed method, an analytical curve was constructed, presenting linearity in a range of 2.50-90.0 µmol L −1 (R = 0.990), with detection limit of 2.20 µmol L −1 and quantification of 2.50 µmol L −1 . The validation of the methodology for the determination of EE using GCE-MWCNTs-CoPc was performed, being accurate, precise, stable and sensitive. The recovery of ethinyl estradiol in the sample of pharmaceutical formulation was 103.93%, in the samples of river water ranged from 92.75% to 96.47%, and in the milk sample was from 88.00% to 96.20%. Thus, the proposed method presented a viable alternative for the determination of ethinyl estradiol in the quality control of pharmaceutical and food formulations as well as in environmental control.

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Section: Catalyst Studymentioning

confidence: 99%

Section: Catalyst Studymentioning

confidence: 99%

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Development of Electrochemical Sensor Based on Carbonaceal and Metal Phthalocyanines Materials for Determination of Ethinyl Estradiol

2019

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“…There are numerous reports on the electrocatalytic properties of carbon materials modified with Co and Fe phthalocyanines and porphyrins and there is a continuously growing research activity in this area [37][38][39]. Whereas the ORR on Cu phthalocyanine (CuPc) and especially on Mn phthalocyanine (MnPc) modified carbon materials is rather poorly investigated compared to aforementioned other transition metal macrocyclic catalysts [21,34,[40][41][42][43][44][45][46][47]. MnPc-based catalysts may reportedly have similar electrochemical behaviour to that of Fe phthalocyanine [41].…”

Section: Introductionmentioning

confidence: 99%

Electrocatalysis of oxygen reduction on multi-walled carbon nanotube supported copper and manganese phthalocyanines in alkaline media

Kaare

Kruusenberg

Merisalu

et al. 2015

J Solid State Electrochem

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Manganese phthalocyanine (MnPc) and copper phthalocyanine (CuPc)-modified electrodes were prepared using multi-walled carbon nanotubes (MWCNTs) as a support material. The catalyst materials were heat treated at four different temperatures to investigate the effect of pyrolysis on the oxygen reduction reaction (ORR) activity of these electrocatalysts. The MWCNT to metal phthalocyanine ratio was varied. Scanning electron microscopy (SEM) was employed to visualise the surface morphology of the electrodes and the x-ray photoelectron spectroscopic (XPS) study was carried out to analyse the surface composition of the most active catalyst materials. The ORR was studied in 0.1 M KOH solution employing the rotating disk electrode (RDE) method. Glassy carbon (GC) electrodes were modified with carbon nanotube-supported metal phthalocyanine catalysts using Tokuyama AS-4 ionomer. The RDE results revealed that the highest electrocatalytic activity for ORR was achieved upon heat treatment at 800°C. CuPc-derived catalyst demonstrated lower catalytic activity as compared to the MnPc-derived counterpart, which is in good agreement with previous literature, whereas the activity of MnPc-based catalyst was higher than that reported earlier.

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“…Co(III)/Co(II), Fe(III)/Fe(II), Mn(III)/Mn (II)), they are especially useful as electrochemical sensors [5]. Electrodes modified with metalloporphyrinoids act as efficient redox mediators to reduce nitrites [6], oxidate hydrazines [7][8][9], thiols [10], as well as in the reduction of oxygen and hydrogen peroxide [11,12]. Hydrazine is known as a strong reducing agent that has been widely applied in industry, especially for rocket fuel production, in hydrazine fuel cells, in catalysts and pharmaceuticals [9,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties of metallated porphyrazines possessing isophthaloxybutylsulfanyl substituents: Application in the electrocatalytic oxidation of hydrazine

Rębiś

Lijewski

Nowicka

et al. 2015

Electrochimica Acta

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The use of copper and cobalt phthalocyanines as electrocatalysts for the oxygen reduction reaction in acid medium

Cited by 53 publications

References 30 publications

Development of Electrochemical Sensor Based on Carbonaceal and Metal Phthalocyanines Materials for Determination of Ethinyl Estradiol

Development of Electrochemical Sensor Based on Carbonaceal and Metal Phthalocyanines Materials for Determination of Ethinyl Estradiol

Electrocatalysis of oxygen reduction on multi-walled carbon nanotube supported copper and manganese phthalocyanines in alkaline media

Electrochemical properties of metallated porphyrazines possessing isophthaloxybutylsulfanyl substituents: Application in the electrocatalytic oxidation of hydrazine

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