Alternative method to obtain the Tafel plot for simple electrode reactions using batch injection analysis coupled with multiple-pulse amperometric detection

Oliveira, Fernando M. de; Guedes, Tiago de Jesus; Lima, Adriano Fonseca; Silva, Leonardo M. Da; Santos, Wallans Torres Pio dos

doi:10.1016/j.electacta.2017.05.018

Cited by 15 publications

(13 citation statements)

References 22 publications

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“…Hence, using equations (1) and (2) it is possible to determine the n ‐value without the previous knowledge of diffusion coefficient ( D ). In addition to traditional methods, the hydrodynamic conditions necessary to apply equation (1) can also be achieved by BIA‐MPA detection . Therefore, in this work the number of electrons was estimated using the SWV for finding the value of α and the BIA‐MPA system for construction the mass‐transfer corrected Tafel plots.…”

Section: Resultsmentioning

confidence: 78%

Simple and Fast Determination of Warfarin in Pharmaceutical Samples Using Boron‐doped Diamond Electrode in BIA and FIA Systems with Multiple Pulse Amperometric Detection

et al. 2017

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This paper proposes the use of the boron‐doped diamond electrode (BDDE) in flow and batch injection analysis (FIA and BIA) systems with multiple‐pulse amperometric (MPA) detection for the determination of warfarin (WA) in pharmaceutical formulations. The electrochemical behavior of WA obtained by cyclic voltammetry (CV) in 0.1 mol L−1 phosphate buffer shows an irreversible oxidation process at +1.0 V (vs Ag/AgCl). The MPA was based on the application of two sequential potential pulses as a function of time on BDDE: (1) for WA detection at +1.2 V/100 ms and; (2) for electrode surface cleaning at −0.2 V/200 ms. Both hydrodynamic systems (FIA‐MPA and BIA‐MPA) used for WA determination achieved high precision (with relative standard deviations around 2 %, n=10), wide linear range (2.0−400.0 μmol L−1), low limits of detection (0.5 μmol L−1) and good analytical frequency (94 h−1 for FIA and 130 h−1 for BIA). The WA determination made by the proposed methods was compared to the official spectrophotometric method. The FIA‐MPA and BIA‐MPA methods are simple and fast, being an attractive option for WA routine analysis in pharmaceutical industries.

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Section: Resultsmentioning

confidence: 78%

Simple and Fast Determination of Warfarin in Pharmaceutical Samples Using Boron‐doped Diamond Electrode in BIA and FIA Systems with Multiple Pulse Amperometric Detection

et al. 2017

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“…(Figure 4b) shows the reduction of PNP to 4-(hydroxyamino) phenol. Two coupled redox peaks have indicated the oxidation of 4-(hydroxyamino) phenol to 4-nitrosophenol and the succeeding reversible reduction [48][49][50][51]. A schematic representation of the involved mechanism has been illustrated in Scheme 2.…”

Section: Electrochemical Behaviour Of Hydrazine and P-nitrophenol On mentioning

confidence: 99%

Ethylene Glycol Functionalized Gadolinium Oxide Nanoparticles as a Potential Electrochemical Sensing Platform for Hydrazine and p-Nitrophenol

Chaudhary

Kumar

et al. 2019

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The current work reports the successful synthesis of ethylene glycol functionalized gadolinium oxide nanoparticles (Gd2O3 Nps) as a proficient electrocatalytic material for the detection of hydrazine and p-nitrophenol. A facile hydrothermal approach was used for the controlled growth of Gd2O3 Nps in the presence of ethylene glycol (EG) as a structure-controlling and hydrophilic coating source. The prepared material was characterized by several techniques in order to examine the structural, morphological, optical, photoluminescence, and sensing properties. The thermal stability, resistance toward corrosion, and decreased tendency toward photobleaching made Gd2O3 nanoparticles a good candidate for the electrochemical sensing of p-nitrophenol and hydrazine by using cyclic voltammetric (CV) and amperometric methods at a neutral pH range. The modified electrode possesses a linear range of 1 to 10 µM with a low detection limit of 1.527 and 0.704 µM for p-nitrophenol and hydrazine, respectively. The sensitivity, selectivity, repeatability, recyclability, linear range, detection limit, and applicability in real water samples made Gd2O3 Nps a favorable nanomaterial for the rapid and effectual scrutiny of harmful environmental pollutants.

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“…The reaction kinetics of the samples were further studied using the Tafel polarization curves (Figure 4). The fluctuation of the CC curve is because of the decomposition of hydrogen peroxide that evolves gas bubbles [16][17][18][19]. In the Tafel plot, the value of exchange current density (j 0 ) can be obtained from Tafel equation (Equation (6)) according to the intercept of y-axis:…”

Section: Tafel Polarization Of the Ag Nw//cc Electrodementioning

confidence: 99%

Boosting the Power-Generation Performance of Micro-Sized Al-H2O2 Fuel Cells by Using Silver Nanowires as the Cathode

et al. 2018

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Micro-sized fuel cells represent one of the pollution-free devices available to power portable electronics. However, the insufficient power output limits the possibility of micro-sized fuel cells competing with other power sources, including supercapacitors and lithium batteries. In this study, a novel aluminum-hydrogen peroxide fuel cell is fabricated using uniform silver nanowires with diameters of 0.25 µm as the catalyst at the cathode side. The Ag nanowire solution is prepared via a polyol method, and mixed uniformly with Nafion and ethanol to enhance the adhesion of Ag nanowires. We carry out electrochemical tests, including cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization, to characterize the performance of this catalyst in H 2 O 2 reduction. The Ag nanowires exhibit a high effectiveness and durability while catalyzing the reduction of H 2 O 2 with a low impedance. The micro-sized Al-H 2 O 2 fuel cell equipped with Ag nanowires delivers a power density of 43 W·m −2 under a low concentration of H 2 O 2 (0.1 M), which is substantially higher than the previously reported devices. Energies 2018, 11, 2316 2 of 10 However, the practical energy density of Al-H 2 O 2 FCs was still insufficient for powering practical micro-sized devices, due to their limited H 2 O 2 catalytic area, poor activity of H 2 O 2 catalyzation, self-decomposition reactions of hydrogen peroxide, as well as aluminum corrosion [9]. Among the above limitations, the cathode performance related to the H 2 O 2 catalyzation plays a vital role in determining the overall fuel cell performance [10-12]. Extensive studies have been carried out in exploring suitable cathode catalysts and architectures for catalyzing H 2 O 2 reduction reactions. Patrissi et al. employed a textile flocking technique to fabricate a microfiber carbon electrode coated by a layer of alloy of Pd and Ir as the cathode [13]. Yang et al. synthesized nano-island-shaped silver particles [2]. The cathode material was achieved by electrodepositing the metallic Ag catalyst on a Ni-foam substrate. Even though Al-H 2 O 2 fuel cells equipped with these cathodes exhibited high power densities, the techniques and materials demonstrated in these works were typically expensive and time-consuming.Here, silver nanowires (Ag NWs) were synthesized and utilized for the first time as the hydrogen peroxide reduction reaction catalyst. The morphology and structure of the Ag NWs coated on carbon paper (denoted as Ag NW//CC hereafter) were characterized using scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). Electrochemical testing methods, including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization curve, were carried out to investigate its catalytic activity and stability. Finally, we designed and fabricated a microfluidic Al-H 2 O 2 FC, and characterized its power-generation performance. Results and Discussions Characterization of Electrode SurfaceThe morphologies of Ag NW//CC were firstly ...

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Alternative method to obtain the Tafel plot for simple electrode reactions using batch injection analysis coupled with multiple-pulse amperometric detection

Cited by 15 publications

References 22 publications

Simple and Fast Determination of Warfarin in Pharmaceutical Samples Using Boron‐doped Diamond Electrode in BIA and FIA Systems with Multiple Pulse Amperometric Detection

Simple and Fast Determination of Warfarin in Pharmaceutical Samples Using Boron‐doped Diamond Electrode in BIA and FIA Systems with Multiple Pulse Amperometric Detection

Ethylene Glycol Functionalized Gadolinium Oxide Nanoparticles as a Potential Electrochemical Sensing Platform for Hydrazine and p-Nitrophenol

Boosting the Power-Generation Performance of Micro-Sized Al-H2O2 Fuel Cells by Using Silver Nanowires as the Cathode

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