Electrocatalytic activity of bimetallic Au–Pd nanoparticles in the presence of cobalt tetraaminophthalocyanine

Maringa, Audacity; Mashazi, Philani; Nyokong, Tebello

doi:10.1016/j.jcis.2014.10.056

Cited by 21 publications

(8 citation statements)

References 49 publications

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“…AuNPs enable fast electron‐transfer kinetics and decrease overpotentials for electrochemical reactions , hence are employed in this work. AuNPs (alone or as composites) have been employed for the detection of a variety of analytes including hydrogen peroxide, hydrazine and nitrite . On the other hand, the recent intense interest in the carbon based nanomaterials (such as multiwalled carbon nanotubes, MWCNTs) has also made a significant impact in the electrocatalytic detection of a wide range of analytes of environmental and biomedical importance , as well as oxygen reduction reactions among others.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and Electrocatalytic Activity of Nanocomposites Consisting of Nanosized Cobalt Tetraaminophenoxy Phthalocyanine, Multi‐walled Carbon Nanotubes and Gold Nanoparticles

Shumba

Nyokong

2016

Electroanalysis

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Glassy carbon electrodes were modified with composites containing cobalt tetraaminophenoxy phthalocyanine nanoparticles (CoTAPhPcNP), multi‐walled carbon nanotubes (MWCNT) and gold nanorods (AuNRs). The modified electrodes were studied for their electrocatalytic behavior towards the reduction of hydrogen peroxide. Phthalocyanine nanoparticles significantly improved electron transfer kinetics as compared to phthalocyanines which are not in the nanoparticle form when alone or in the presence of multiwalled carbon nanotubes (MWCNTs). CoTAPhPcNP‐MWCNT‐GCE proved to be suitable for hydrogen peroxide detection with a catalytic rate constant of 3.45×103 M−1 s−1 and a detection limit of 1.61×10−7 M. Adsorption Gibbs free energy ΔGo was found to be −19.22 kJ mol−1 for CoTAPhPcNP‐MWCNT‐GCE.

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Section: Introductionmentioning

confidence: 99%

“…Phthalocyanines (Pcs) are well known electrocatalysts . Transforming Pcs into nanoparticles has recently opened a new interest in the electrocatalytic detection of a number of physiologically important molecules .…”

Section: Introductionmentioning

confidence: 99%

Characterization and Electrocatalytic Activity of Nanocomposites Consisting of Nanosized Cobalt Tetraaminophenoxy Phthalocyanine, Multi‐walled Carbon Nanotubes and Gold Nanoparticles

Shumba

Nyokong

2016

Electroanalysis

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“…20 Any deviation from these bond energies implies that the AuNPs are interacting with other elements. 21 In our case two bond Figure 3c shows the carbon single/double bonds (C-C/C=C, peak 2, 284.8 eV), and oxygen-containing functional groups dominated by hydroxyl and epoxy groups (C-OH/C-O-C, peak 4, 286.6 eV) with relatively small amounts of carbonyl (C=O, peak 5, 287.8 eV) and carboxylic (COO, peak 1, 289.2 eV) groups. 22 The peak at 285.7 eV (peak 3) corresponds to the C-N from the PAA.…”

Section: Resultsmentioning

confidence: 99%

Facile fabrication of highly flexible graphene paper for photocatalytic reduction of 4-nitrophenol

Chen

Jiang

et al. 2015

Bull Mater Sci

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Freestanding paper-like materials prepared from chemically derived graphene have considerable potential as a carbon-based catalyst in high-performance flexible catalytic reaction. Herein, a highly flexible graphene paper (GP) assembled from graphene oxides (GOs) with the aid of polyacrylamide (PAA) and electroless deposition of gold nanoparticles (AuNPs) was prepared. In contrast to previous reports on GOs based on a flow-directed assembly of graphene sheets, this GOs/PAA/Au composite paper exhibited a highly wrinkled and disordered morphology. The resultant GOs/PAA/Au composite paper was applied as a catalytic material for the reduction of 4-nitrophenol and showed the favour separation, recovery and cyclic utilization properties.

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“…6), it is clear that the maximum oxidation peak potentials in the forwarding scan showed a positive shift followed by the increment in the current. This positive shift of maximum forward peak potentials with the scan rates is a feature of irreversible systems [41][42][43]. Figure 7 displays the CV profile of all the synthesized Ag/C catalysts in the same solution.…”

Section: Electrocatalytic Performances Of Ag/cmentioning

confidence: 99%

Surfactant-free synthesis of carbon-supported silver (Ag/C) nanobars as an efficient electrocatalyst for alcohol tolerance and oxidation of sodium borohydride in alkaline medium

et al. 2021

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We have synthesized carbon-supported silver (Ag/C) nanobars by a simple surfactant-free hydrothermal method using glucose as the reducing reagent as well as the source of carbon in Ag/C nanobars. Physicochemical characterization of the materials was performed by X-ray Diffraction (XRD), field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The XRD pattern confirmed the presence of a pure metallic silver phase. No carbon phase was detected, which indicates that the carbon exists mainly in the amorphous form. The electrocatalytic activity of Ag/C in different electrolyte solutions such as 0.5 M NaOH, 0.5 M NaOH + 1 M ethanol (EtOH), 0.5 M NaOH + 1 M ethylene glycol (EG), and 0.5 M NaOH + 0.01 M NaBH4 (sodium borohydride) was studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CA) study. Alcohol tolerance of the catalysts was also established in the presence of ethanol and ethylene glycol. The forward-to-backward current ratio from cyclic voltammetry (CV) study of Ag/C-20 (20 h) in 0.5 M NaOH + 1 M ethanol solution at 100 mV s−1 scan rate is 4.13 times higher compared to that of Ag/C-5 (5 h). Hence, Ag/C-20 is a better candidate for the tolerance of ethanol. In the presence of ethylene glycol (1 M) in 0.5 M NaOH solution, it is obtained that the forward-to-backward current ratio at the same scan rate for Ag/C-20 is lower than that in the presence of ethanol. The durability of the catalyst was studied by chronoamperometry measurement. We studied the electrochemical kinetics of Ag/C catalysts for borohydride oxidation in an alkaline medium. The basic electrochemical results for borohydride oxidation show that Ag/C has very well strength and activity for direct borohydride oxidation in an alkaline medium. The reaction of borohydride oxidation with the contemporaneous BH4−. hydrolysis was noticed at the oxidized silver surface. Among all the synthesized Ag/C catalysts, Ag/C-20 exhibited the best electrocatalytic performance for borohydride oxidation in an alkaline medium. The activation energy and the number of exchange electrons at Ag/C-20 electrode surface for borohydride electro-oxidation were estimated as 57.2 kJ mol−1 and 2.27, respectively.

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Electrocatalytic activity of bimetallic Au–Pd nanoparticles in the presence of cobalt tetraaminophthalocyanine

Cited by 21 publications

References 49 publications

Characterization and Electrocatalytic Activity of Nanocomposites Consisting of Nanosized Cobalt Tetraaminophenoxy Phthalocyanine, Multi‐walled Carbon Nanotubes and Gold Nanoparticles

Characterization and Electrocatalytic Activity of Nanocomposites Consisting of Nanosized Cobalt Tetraaminophenoxy Phthalocyanine, Multi‐walled Carbon Nanotubes and Gold Nanoparticles

Facile fabrication of highly flexible graphene paper for photocatalytic reduction of 4-nitrophenol

Surfactant-free synthesis of carbon-supported silver (Ag/C) nanobars as an efficient electrocatalyst for alcohol tolerance and oxidation of sodium borohydride in alkaline medium

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