Heterogeneous Electron Transfer and Oxygen Reduction Reaction at Nanostructured Iron(II) Phthalocyanine and Its MWCNTs Nanocomposites

Mamuru, Solomon A.; Ozoemena, Kenneth I.

doi:10.1002/elan.200900438

Cited by 37 publications

(22 citation statements)

References 64 publications

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“…Next, the type of the diffusion process that could be occurring at the Pt/NiNP electrode was interrogated by using the ''diffusion domain approximation'' theory developed by Davies and Compton [30,31] which can also be applied to a three-dimensional electrochemically heterogeneous electrode [32]. It can be seen in Fig.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Voltammetric and impedimetric behaviour of phytosynthesized nickel nanoparticles

Mamuru

Jaji

2015

J Nanostruct Chem

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The biosynthesis of nickel nanoparticles from nickel chloride using Moringa oleifera leaf extract as reducing agent was successfully carried out; the formation of nickel nanoparticles was confirmed by the use of UVvisible spectroscopy, FTIR spectroscopy, atomic force microscopy, cyclic voltammetry and electrochemical impedance spectroscopy techniques. Optical property showed a colour change from faint light blue of the nickel chloride to dark reddish brown of the nickel nanoparticle after addition of the plant extract, while FTIR confirmed the possible biomolecule responsible for the reduction as anthraquinones; the UV-visible spectroscopy showed the wavelength of nickel nanoparticles at 297 nm, and atomic force microscopy gave images of the nickel nanoparticles as aggregate nanoclusters. Voltammetric and impedimetric behaviour of the nickel nanoparticles towards a one-electron-transfer redox probe was interrogated using cyclic voltammetry and impedance spectroscopy. The equivalent electrical circuit used to fit the measured impedance data indicates that the nanoparticles exhibited patterns characteristic of superimposed porous layer. Electron transfer rate constant K s and the apparent heterogeneous electron transfer constant K app were calculated as 6.18 9 10 18 and 1.60 9 10 -3 cm s -1 , respectively. Such high value is an indication of how fast the nickel nanoparticle can transfer electron from the nanoparticle to the underlying platinum electrode, implying that the nanoparticle can be a potential candidate in the fabrication of biosensors and in catalysis.

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Section: Electrochemical Characterizationmentioning

confidence: 99%

Voltammetric and impedimetric behaviour of phytosynthesized nickel nanoparticles

Mamuru

Jaji

2015

J Nanostruct Chem

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“…Their intriguing properties have attracted much attention after the discovery that Co-Pc might replace platinum as an electrocatalyst in the ORR [6,7]; in extensive follow-up studies [8][9][10][11][12][13][14][15][16][17][18][19][20] it was reported that a pyrolyzed transition-metal Pc can be even more effective. In addition, pyrolyzed phthalocyanines have been used more recently as raw materials in the production of carbon nanotubes [21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Pyrolyzed phthalocyanines as surrogate carbon catalysts: Initial insights into oxygen-transfer mechanisms

Vallejos-Burgos

Utsumi

Hattori

et al. 2012

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a b s t r a c tDeposited and heat-treated phthalocyanines are promising electrocatalysts for replacing platinum in the oxygen reduction reaction (ORR), the most important process in energy conversion systems such as fuel cells; and yet its key mechanistic features are not well understood. To optimize their use, it is necessary to understand their behavior in the absence of an electric field. In the pursuit of this goal, we pyrolyzed metal-free, cobalt and copper phthalocyanines between 550 and 1000°C and studied their structural and chemical changes by elemental analysis, N 2 and CO 2 adsorption, X-ray diffraction (XRD), Raman spectroscopy, X-ray analysis fine structure (XAFS) and X-ray photoelectron spectroscopy (XPS). Their catalytic activity was assessed by non-isothermal O 2 gasification and NO reduction reactions. A comparison of these results with their other properties allowed us to reach the following conclusions: (i) the loss of reactivity of metal-free phthalocyanine with heat treatment is attributed to its structural annealing and heteroatom loss, with the porosity changes having no effect; (ii) for metal phthalocyanines at intermediate heat treatment temperatures, the optimum in reactivity correlates with the micropore surface area and the presence of metal particles, with no influence of nitrogen content; (iii) the coordination metal increases phthalocyanine thermal stability in an inert atmosphere, but in an oxidizing atmosphere it acts as a gasification catalyst even below decomposition temperatures. The implications of these findings for catalytic oxygen-transfer mechanisms are discussed.

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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.…”

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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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Heterogeneous Electron Transfer and Oxygen Reduction Reaction at Nanostructured Iron(II) Phthalocyanine and Its MWCNTs Nanocomposites

Cited by 37 publications

References 64 publications

Voltammetric and impedimetric behaviour of phytosynthesized nickel nanoparticles

Voltammetric and impedimetric behaviour of phytosynthesized nickel nanoparticles

Pyrolyzed phthalocyanines as surrogate carbon catalysts: Initial insights into oxygen-transfer mechanisms

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

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