Surface and electrochemical characterization of aryl films grafted on polycrystalline copper from the diazonium compounds using the rotating disk electrode method

Mooste, Marek; Kisand, Vambola; Marandi, Margus; Matisen, Leonard; Sammelselg, Väinö; Podvorica, Fetah I.; Tammeveski, Kaido

doi:10.1016/j.jelechem.2018.03.070

Cited by 15 publications

(13 citation statements)

References 57 publications

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“…Results are displayed in Figure 2. All plots presented linear tendency between data from faradaic current peaks and scan rate's square root (Figure 2), which is in accordance with literature and experimental conditions, since data was taken in a diffusion controlled environment [14,15]. Moreover, electrode surface area was determined by Randles-Sevcik equation (1), using 0.001 mol L -1 potassium ferrocyanide and 0.1 mol L -1 KCl as reversible one-electron diffusion controlled redox system.…”

Section: Resultssupporting

confidence: 81%

Predictive Modelling to Study the Electrochemical Behaviour of PdO, TiO2 and Perovskite-Type LaFeO3 Modified Carbon Paste Electrodes

Thomaz

Filho

Macêdo

et al. 2019

PoS

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Transition metals are highly sought after in electrode construction due to their eventual electrocatalytic effects. In this context, this work presents the study of several metal oxide modified electrodes focusing in the evaluation of their electrochemical features through voltammetry and Electrochemical Impedance Spectroscopy (EIS). Moreover, a predictive statistical model was also developed using LASSO regression. Henceforth, glassy carbon electrode (GCE) and carbon paste electrode (CPE) were used to establish correlations between the herein studied modifications, namely: PdO@CPE, TiO 2 @CPE, and LaFeO 3 @CPE. Results evidence that metal oxide modified electrodes may increase signal detection through electrocatalytic effects, however, the herein developed model evidenced that surface area plays a major role in electrode response through voltammetry.

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Section: Resultssupporting

confidence: 81%

Predictive Modelling to Study the Electrochemical Behaviour of PdO, TiO2 and Perovskite-Type LaFeO3 Modified Carbon Paste Electrodes

Thomaz

Filho

Macêdo

et al. 2019

PoS

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“…The plot presented linear tendency between data from faradaic current peaks and square root of scan rate’s (Figure 1B), which is in accordance with literature and experimental conditions, since data was taken in potassium ferrocyanide, which is a probe known for its diffusion controlled electrochemical process. 16,19,20 Moreover, electrode surface area was determined by the Randles-Sevcik equation (1), using a 1 mmol L -1 potassium ferrocyanide and 0.1 mol L -1 KCl solution as a reversible one-electron diffusion controlled redox system.…”

Section: Resultsmentioning

confidence: 99%

Determination of Methyldopa and Paracetamol in Pharmaceutical Samples by a Low Cost Genipa americana L. Polyphenol Oxidase Based Biosensor

et al. 2019

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Purpose: Jenipapo fruit (Genipa americana L) is a natural source of polyphenol oxidases (PPOs) whose potential in pharmaceutical analysis is noteworthy. Henceforth, this work reports the electrochemical study of a low-cost PPO-based biosensor produced from the crude extract of Jenipapo fruits and accounts a practical approach to employ this biosensor in the determination of methyldopa and paracetamol in pharmaceutical samples. Methods: In order to investigate the electrochemical properties of the biosensor, theoretical and practical approaches were employed, and both samples and the biosensor were analyzed through electrochemical impedance spectroscopy (EIS) and voltammetric techniques, namely: differential pulse voltammetry (DPV) and cyclic voltammetry (CV). Results: showcased that the biosensor presented good analytical features, as well as low detection limits (8 μmol L-1 for methyldopa and 5 μmol L-1 for paracetamol). The relative standard deviation was less than 5% mid-assay. Conclusion: The use of this biosensor is a reliable, low cost and useful alternative in the pharmaceutic determination of phenolic drugs (e.g. methyldopa and paracetamol).

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“…XPS spectra of N30 and B60 are used as representative XPS spectra for NBD and BBD functionalized graphene. where -N=N-groups come from the attack of NBD to those NBD grafted on graphene surfaces and NO2 are the nitro groups of NBD [33], [34]. As demonstrated in Figure 3 These functional groups are believed to cause the increase in the interlayer distances as is evident from the extra peaks appearing at 2θ ~ 10° for both N30 and B60 in the XRD patterns (Figure 3 e)) compared to EEG.…”

Section: Characterizationmentioning

confidence: 95%

Simultaneous Electrochemical Exfoliation and Chemical Functionalization of Graphene for Supercapacitor Electrodes

Zhuo

Kinloch

Bissett

2020

J. Electrochem. Soc.

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The demand for efficient electrochemical energy storage technology, such as supercapacitors, continues to increase as both the energy and power demands of devices grow. Graphene has attracted wide interest in addressing this energy challenge due to its high conductivity and specific surface area. However, in reality the hydrophobic properties and the restacking of the graphene sheets during device manufacture leads to significantly lower storage performance than that theoretically predicted for isolated sheets. Herein, functionalized graphene was prepared by a convenient one-pot process, where graphene was functionalized with aryl diazonium salts (4nitrobenzenediazonium tetrafluoroborate (NBD) and 4-bromobenzenediazonium tetrafluoroborate (BBD)) simultaneously during oxidative electrochemical exfoliation of graphite. It was found that the specific capacitance for functionalized graphene was significantly improved compared to pristine graphene due to the introduction of pseudocapacitance by the aryl diazonium salts. The dispersibility of functionalized graphene in water was also found to be improved, implying a better hydrophilicity. NBD functionalized graphene which had been exfoliated/functionalized for a total of 30 minutes exhibited the best energy storage properties with a 5 times increase in specific capacitance (17 mF cm-2) compared to pristine graphene (3 mF cm-2).

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Surface and electrochemical characterization of aryl films grafted on polycrystalline copper from the diazonium compounds using the rotating disk electrode method

Cited by 15 publications

References 57 publications

Predictive Modelling to Study the Electrochemical Behaviour of PdO, TiO2 and Perovskite-Type LaFeO3 Modified Carbon Paste Electrodes

Predictive Modelling to Study the Electrochemical Behaviour of PdO, TiO2 and Perovskite-Type LaFeO3 Modified Carbon Paste Electrodes

Determination of Methyldopa and Paracetamol in Pharmaceutical Samples by a Low Cost Genipa americana L. Polyphenol Oxidase Based Biosensor

Simultaneous Electrochemical Exfoliation and Chemical Functionalization of Graphene for Supercapacitor Electrodes

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