Effects of ring substituents on electrocatalytic activity of manganese phthalocyanines towards the reduction of molecular oxygen

Sehlotho, Nthapo; Nyokong, Tebello

doi:10.1016/j.jelechem.2006.07.011

Cited by 66 publications

(35 citation statements)

References 34 publications

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“…This procedure was also repeated six times and the relative standard deviation (SD) obtained was <4%. Figure 6c depicts the RDE voltammograms obtained at different rotating speeds (ω) for [46, 49,50]:…”

Section: Effect Of Varying Scan Ratementioning

confidence: 99%

Electrocatalytic properties of prussian blue nanoparticles supported on poly(m-aminobenzenesulphonic acid)-functionalised single-walled carbon nanotubes towards the detection of dopamine

Adekunle

Farah

Pillay

et al. 2012

Colloids and Surfaces B: Biointerfaces

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Edged plane pyrolytic graphite electrode (EPPGE) was modified with and without Prussian blue (PB) nanoparticles and polyaminobenzene sulphonated single-walled carbon nanotubes (SWCNTPABS) using the chemical deposition method. The electrodes were characterised using microscopy, spectroscopy and electrochemical techniques. Results showed that edged plane pyrolytic graphite-single-walled carbon nanotubes-prussian blue (EPPGE-SWCNT-PB) electrode gave the best dopamine (DA) current response which increases with increasing PB layers. The catalytic rate constant of 1.69 x 10 5 mol -1 cm 3 s -1 , Tafel value of 112 mVdec -1 , and limit of detection of DA (2.8 nM) were obtained. Dopamine could be simultaneously detected with ascorbic acid. The electrode was found to be electrochemically stable, reusable and can be used for the analysis of DA in real drug samples.Keywords: Prussian blue nanoparticles; Dopamine; Electrochemical impedance spectroscopy; Interferences; Ascorbic acid IntroductionCarbon nanotubes (CNTs) are excellent electrical conducting nanowires with unique properties such as high tensile strength, electrical conductivity, chemical stability and flexibility. They are essential and promising materials in the field of nano-science and nanotechnology because of their electronic properties and large surface area [1][2][3]. Their contribution to the improvement of electrical properties of some bare electrode such as the glassy carbon [4][5][6], graphite [7][8][9][10], carbon fiber [11], gold [12][13][14][15], and platinum (Pt) electrodes [16] have been reported. As part of its numerous applications, Han et al. [17] considered CNTs as suitable mediators for prussian blue (PB)-modified electrodes because of their good electrical conductivity and the property of being particle carriers.Prussian blue (PB) is a polynuclear and mixed-valent iron cyanide complex with a repeating unit of potassium ferrous ferricyanide hexacyano hexahydrate (Fe 4 (III) [Fe(II) (CN) 6 ] 3 ) . Prussian blue has unique properties in its structural arrangement which allows compositional variation by combining with several transition metal ions in different oxidation states such as Co 2+ , and Co 3+ , and Ni 2+ [18]. This metal substitution and variation leads to a combination of properties that are not readily found in other inorganic materials [19]. Its unique properties, synthetic versatility and the ability of the cyanide ligands to bridge other ions have been explored in its application in electrochromic devices [20] Equipment and ProcedureThe edge plane pyrolytic graphite electrode plate (3 mm diameter) was purchased from Le Carbone, Sussex, UK and was constructed locally at the University of Pretoria technical workshop. The plate was placed in a teflon tube, extended outside with a copper wire to make electrical contact with the electrochemical equipment. The energy dispersive X-ray spectra were Ag|AgCl in sat. KCl). An Ag|AgCl in saturated KCl and platinum wire were used as reference and counter electrodes, respectively...

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Section: Effect Of Varying Scan Ratementioning

confidence: 99%

Electrocatalytic properties of prussian blue nanoparticles supported on poly(m-aminobenzenesulphonic acid)-functionalised single-walled carbon nanotubes towards the detection of dopamine

Adekunle

Farah

Pillay

et al. 2012

Colloids and Surfaces B: Biointerfaces

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“…[14][15][16]. Despite the popularity of ruthenium-based electrocatalysts for ORR, as elegantly reviewed recently by Lee and Popov [1], the use of ruthenium phthalocyanine (RuPc) complexes in ORR is virtually unknown.…”

mentioning

confidence: 99%

“…for ORR, research direction is now geared towards the use of their nanoparticles [2][3][4]. Metallophthalocyanine (MPc) complexes represent a unique class of N 4 -macrocyclic metal compounds that have applications in various fields such as sensors [5,6], photocatalysts [7,8], electrocatalysts [9][10][11][12], supercapacitors [13] and ORR [14][15][16]. Despite the popularity of ruthenium-based electrocatalysts for ORR, as elegantly reviewed recently by Lee and Popov [1], the use of ruthenium phthalocyanine (RuPc) complexes in ORR is virtually unknown.…”

mentioning

confidence: 99%

Efficient Oxygen Reduction Reaction Using Ruthenium Tetrakis(diaquaplatinum)Octacarboxyphthalocyanine Catalyst Supported on MWCNT Platform

2010

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Electrocatalytic reduction of molecular oxygen in alkaline solution using a novel ruthenium tetrakis(diaquaplatinum)octacarboxyphthalocyanine (RuOCPcPt) electrocatalyst supported on multi-walled carbon nanotube electrode has been described. We show that the oxygen reduction activity follows a direct 4-electron transfer process at high kinetic rate constant, 3.57 10 À2 cm s À1. [14][15][16]. Despite the popularity of ruthenium-based electrocatalysts for ORR, as elegantly reviewed recently by Lee and Popov [1], the use of ruthenium phthalocyanine (RuPc) complexes in ORR is virtually unknown. MPc complexes integrated or supported on carbon nanotubes (CNTs) improve electrocatalytic performance of electrodes [17]. In this communication, we report the electrocatalytic reduction of oxygen using a novel ruthenium tetrakis(diaquaplatinum)octacarboxy-phthalocyanine (abbreviated here as RuOCPcPt, Figure 1) as catalyst on a basal plane pyrolytic graphite electrode (BPPGE) platform pre-modified with or without multiwalled carbon nanotubes (MWCNTs). We clearly show that the BPPGE-MWCNTs-RuOCPcPt electrode can enhance the electrocatalytic performance of the ORR in al- Fig. 1. Structure of ruthenium tetrakis(diaquaplatinum) octacarboxy phthalocyanine. Keywords

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“…Reportedly, the ORR on transition metal macrocycle-modified carbon electrodes also depends on the solution pH. Sehlotho and Nyokong investigated the pH dependence of the ORR on Mn phthalocyanine complexes by varying the pH value of solution from 1 to 12 [33]. It was found that the ORR follows a 2-electron pathway in acidic media while the electron transfer number per O 2 molecule is four in alkaline media.…”

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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Effects of ring substituents on electrocatalytic activity of manganese phthalocyanines towards the reduction of molecular oxygen

Cited by 66 publications

References 34 publications

Electrocatalytic properties of prussian blue nanoparticles supported on poly(m-aminobenzenesulphonic acid)-functionalised single-walled carbon nanotubes towards the detection of dopamine

Electrocatalytic properties of prussian blue nanoparticles supported on poly(m-aminobenzenesulphonic acid)-functionalised single-walled carbon nanotubes towards the detection of dopamine

Efficient Oxygen Reduction Reaction Using Ruthenium Tetrakis(diaquaplatinum)Octacarboxyphthalocyanine Catalyst Supported on MWCNT Platform

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

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