scholarly journals Graphene Oxide-Paraffin as Working Electrode for Cyclic Voltammetry Analysis for Cadmium(II)

2019 ◽  
Vol 31 (3) ◽  
pp. 575-580
Author(s):  
Pirim Setiarso ◽  
Taufik Hidayatulloh
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Deposition Time ◽  
Optimum Conditions ◽  
Average Recovery ◽  
Composition Ratio ◽  
Working Electrode ◽  
Scan Rate ◽  
Optimum Ph ◽  
Cyclic Voltammetry Analysis

In this work, the composition ratio of graphene oxide-paraffin as the best working electrode for analysis of cadmium solution at optimum conditions using cyclic voltammetry is reported. Graphene oxide from graphite was synthesized and characterized using the improved Hummer method. Testing the composition and condition of graphene oxide:paraffin electrode is best done by manipulating the graphene oxide:paraffin ratio, pH, deposition time and scan rate. The composition with a ratio of 8:2 % of graphene oxide:paraffin electrode produces the best of voltammogram. Recovery analysis is also performed with the results of linear curves in cadmium(II) solution with linearity 0.98992. Cyclic voltammetry analysis using graphene oxide:paraffin electrodes at optimum pH resulted an average recovery of 97.64 %.

scholarly journals Graphene Oxide-Paraffin-Nanobentonite as Working Electrode for Cyclic Voltammetry Analysis for Nicotinic Acid

2021 ◽  
Vol 33 (4) ◽  
pp. 757-761
Author(s):  
PIRIM SETIARSO ◽  
NERRY PUSPITA SARI
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Nicotinic Acid ◽  
Optimum Conditions ◽  
Working Electrode ◽  
Cyclic Voltammetry Analysis

The composition of graphene oxide (GO):paraffin:nanobentonite electrode was optimized to acquire the optimal working electrode to analyze nicotinic acid under the optimum conditions through cyclic voltammetry. Graphene oxide was synthesized from graphite by employing the improved Hummer method. Bentonite was synthesized using the sonothermal method. The ratio of GO:paraffin:nanobentonite electrodes of 3:3:4 provided the optimal voltammogram. The results indicated that the composition of the comparative working electrodes of GO-modified nanobentonite was best 3:3:4 with a good peak recovery averaged value of 96.16%.

scholarly journals Synthesis of Graphene Oxide-Nanozeolite Composite Electrode for Aspirin Analysis by Cyclic Voltammetry

2020 ◽  
Vol 32 (10) ◽  
pp. 2541-2544
Author(s):  
Pirim Setiarso ◽  
Firma Inggriani
Keyword(s):  
Graphene Oxide ◽  
Deposition Time ◽  
Composite Electrode ◽  
Cyclic Voltammetric ◽  
Voltammetric Analysis ◽  
Scan Rate ◽  
Milling Method ◽  
Recovery Percentage ◽  
Limit Detection ◽  
Mechanical Ball Milling

A graphene oxide-nanozeolite composite was prepared and empolyed as electrode for cyclic voltammetric analysis of aspirin. Graphene oxide was synthesized with the improved Hummer method, while nanozeolite synthesized using a mechanical ball milling method. Cyclic voltammetric analysis of aspirin was influenced by several factors viz. the composition of working electrode, pH, deposition time and scan rate. The optimized parameters of graphene oxide-nanozeolite composite electrode has the best composition at a ratio of 3:2:5 at pH of solution 4, deposition time at 5 s and scan rate at 100 mV s-1. A recovery percentage of 99.61% having limit detection of electrode was 0.0611 ppm (0.002 mM).

MODIFICATION OF SCREEN PRINTED CARBON ELECTRODEBY POLYPYRROLE FOR DETERMINATION OF HYDROQUINONE

2016 ◽  
Vol 12 (1) ◽  
Author(s):  
Khoirul Ngibad
Keyword(s):  
Cyclic Voltammetry ◽  
Room Temperature ◽  
Deionized Water ◽  
Optimum Conditions ◽  
Cathodic Peak ◽  
Screen Printed Carbon Electrode ◽  
Scan Rate ◽  
Number Of Cycles ◽  
Screen Printed

<p>Electropolymerization of polypyrrole for determination of hydroquinone on screen printed carbon electrode (SPCE) was performed using cyclic voltammetry. Electropolymerization of polypyrrole on SPCE begins with determining the optimum conditions of cyclic voltammetry (working potential, scan rate, number of cycles) and the conditions of solution (pyrrole and KCl concentrations).The working potential were varied at 0 – 0.8; 0 – 0.9; 0 – 1 V. The variation of scan rate were 50, 100, 150 mV/s and number of cycleswere 5, 10,15 cycles. The influence of pyrrole concentration was studied by providing variation of 5, 50, 100 mM. Meanwhile, the KCl concentration were at 0.1; 0.5; 1 M. The SPCE modified with polypyrrole was washed with deionized water and was dried at room temperature. The prepared polypyrrole was analyzed and based on the high anodic and cathodic peak current of the hydroquinone, it is confirmed that the preparation was succefully conducted. The optimum conditions on electropolymerization of polypyrrole areat the working potential of 0 – 0.9 V; the scan rate 100 of mV/s; the number of cyclesis 10, and at thepyrroleconcentration of 50 mM and KCl concentration of 0.5 M. SPCE modified polypyrrole can determine the hydroquinone at the concentration range of 5 – 100 μM with the sensitivity of 0.120 μA/Μm and the detection limit (S/N = 3) of 0.8 μM.</p>

scholarly journals MODIFICATION OF SCREEN PRINTED CARBON ELECTRODEBY POLYPYRROLE FOR DETERMINATION OF HYDROQUINONE

2016 ◽  
Vol 12 (1) ◽  
pp. 36
Author(s):  
Khoirul Ngibad ◽  
Ani Mulyasuryani ◽  
Diah Mardiana
Keyword(s):  
Cyclic Voltammetry ◽  
Room Temperature ◽  
Deionized Water ◽  
Optimum Conditions ◽  
Cathodic Peak ◽  
Screen Printed Carbon Electrode ◽  
Scan Rate ◽  
Number Of Cycles ◽  
Screen Printed

<span class="hps"><span lang="EN-US">Electropolymerization of polypyrrole for determination of hydroquinone on screen printed carbon electrode (SPCE) was performed using cyclic voltammetry. Electropolymerization of polypyrrole on SPCE begins with determining the optimum conditions of cyclic voltammetry (working potential, scan rate, number of cycles) and the conditions of solution (pyrrole and KCl concentrations).The working potential were varied at 0 – 0.8; 0 – 0.9; 0 – 1 V. The variation of scan rate were 50, 100, 150 mV/s and number of cycleswere 5, 10,15 cycles. The influence of pyrrole concentration was studied by providing variation of 5, 50, 100 mM. Meanwhile, the KCl concentration were at 0.1; 0.5; 1 M. The SPCE modified with polypyrrole was washed with deionized water and was dried at room temperature. The prepared polypyrrole was analyzed and based on the high anodic and cathodic peak current of the hydroquinone, it is confirmed that the preparation was succefully conducted. The optimum conditions on electropolymerization of polypyrrole areat the working potential of 0 – 0.9 V; the scan rate 100 of mV/s; the number of cyclesis 10, and at thepyrroleconcentration of 50 mM and KCl concentration of 0.5 M. SPCE modified polypyrrole can determine the hydroquinone at the concentration range of 5 – 100 μM with the sensitivity of 0.120 </span></span><span lang="EN-US">μA/Μm <span class="hps">and the detection limit (S/N = 3) of 0.8 μM.</span></span>

scholarly journals MODIFICATION OF SCREEN PRINTED CARBON ELECTRODEBY POLYPYRROLE FOR DETERMINATION OF HYDROQUINONE

2016 ◽  
Vol 12 (1) ◽  
pp. 36
Author(s):  
Khoirul Ngibad ◽  
Ani Mulyasuryani ◽  
Diah Mardiana
Keyword(s):  
Cyclic Voltammetry ◽  
Room Temperature ◽  
Deionized Water ◽  
Optimum Conditions ◽  
Cathodic Peak ◽  
Screen Printed Carbon Electrode ◽  
Scan Rate ◽  
Number Of Cycles ◽  
Screen Printed

<span class="hps"><span lang="EN-US">Electropolymerization of polypyrrole for determination of hydroquinone on screen printed carbon electrode (SPCE) was performed using cyclic voltammetry. Electropolymerization of polypyrrole on SPCE begins with determining the optimum conditions of cyclic voltammetry (working potential, scan rate, number of cycles) and the conditions of solution (pyrrole and KCl concentrations).The working potential were varied at 0 – 0.8; 0 – 0.9; 0 – 1 V. The variation of scan rate were 50, 100, 150 mV/s and number of cycleswere 5, 10,15 cycles. The influence of pyrrole concentration was studied by providing variation of 5, 50, 100 mM. Meanwhile, the KCl concentration were at 0.1; 0.5; 1 M. The SPCE modified with polypyrrole was washed with deionized water and was dried at room temperature. The prepared polypyrrole was analyzed and based on the high anodic and cathodic peak current of the hydroquinone, it is confirmed that the preparation was succefully conducted. The optimum conditions on electropolymerization of polypyrrole areat the working potential of 0 – 0.9 V; the scan rate 100 of mV/s; the number of cyclesis 10, and at thepyrroleconcentration of 50 mM and KCl concentration of 0.5 M. SPCE modified polypyrrole can determine the hydroquinone at the concentration range of 5 – 100 μM with the sensitivity of 0.120 </span></span><span lang="EN-US">μA/Μm <span class="hps">and the detection limit (S/N = 3) of 0.8 μM.</span></span>

Enhancement of Graphene Oxide Deposition on Stainless Steel in Presence of Iodine

2019 ◽  
Vol 801 ◽  
pp. 160-165
Author(s):  
Kholoud Madih ◽  
Ahmed H. El-Shazly ◽  
Essam Hares
Keyword(s):  
Stainless Steel ◽  
Graphene Oxide ◽  
Deposition Time ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
Characteristic Peak ◽  
Stable Suspension ◽  
Steel Strips ◽  
Oxide Deposition ◽  
Modified Hummers Method

In this study, Graphene Oxide (GO) was prepared by modified Hummers method and characterized by X-ray diffraction technique (XRD). The characteristic peak of GO was observed at 2=10.94° compared to graphite’s peak at 2 = 26.4°. Aqueous stable suspension of GO was prepared, and its stability was confirmed using Zeta potential and found to be-28.9 mV. Electrophoretic Deposition (EPD) process of GO on stainless steel strips was investigated. The EPD process was optimized to obtain a large amount of deposited GO layer. The optimal applied voltage was found to be 30 V and optimal deposition time was 480 seconds. At the optimum conditions, the effect of the addition of iodine was investigated for its effect on the deposited layer homogeneity. Visual investigation of samples indicated that the homogeneity of the GO coated layer was enhanced in the presence of iodine and confirmed by scanning electron microscope (SEM).

Solar Exfoliated Graphene Oxide: A Platform for Electrochemical Sensing of Epinephrine

2020 ◽  
Vol 16 (4) ◽  
pp. 393-403 ◽  
Author(s):  
Renjini Sadhana ◽  
Pinky Abraham ◽  
Anithakumary Vidyadharan
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Simultaneous Detection ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Reduced Graphene ◽  
Pulse Voltammetry

Introduction: In this study, solar exfoliated graphite oxide modified glassy carbon electrode was used for the anodic oxidation of epinephrine in a phosphate buffer medium at pH7. The modified electrode showed fast response and sensitivity towards Epinephrine Molecule (EP). The electrode was characterized electrochemically through Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV). Area of the electrode enhanced three times during modification and studies reveal that the oxidation process of EP occurs by an adsorption controlled process involving two electrons. The results showed a detection limit of 0.50 ± 0.01μM with a linear range up to 100 μM. The rate constant calculated for the electron transfer reaction is 1.35 s-1. The electrode was effective for simultaneous detection of EP in the presence of Ascorbic Acid (AA) and Uric Acid (UA) with well-resolved signals. The sensitivity, selectivity and stability of the sensor were also confirmed. Methods: Glassy carbon electrode modified by reduced graphene oxide was used for the detection and quantification of epinephrine using cyclic voltammetry and differential pulse voltammetry. Results: The results showed an enhancement in the electrocatalytic oxidation of epinephrine due to the increase in the effective surface area of the modified electrode. The anodic transfer coefficient, detection limit and electron transfer rate constant of the reaction were also calculated. Conclusion: The paper reports the determination of epinephrine using reduced graphene oxide modified glassy carbon electrode through CV and DPV. The sensor exhibited excellent reproducibility and repeatability for the detection of epinephrine and also its simultaneous detection of ascorbic acid and uric acid, which coexist in the biological system.

The voltammetric determination of 4-nitrobiphenyl

1991 ◽  
Vol 56 (3) ◽  
pp. 595-601 ◽  
Author(s):  
Jiří Barek ◽  
Gulamustafa Malik ◽  
Jiří Zima
Keyword(s):  
Differential Pulse Voltammetry ◽  
Differential Pulse ◽  
Voltammetric Determination ◽  
Hanging Mercury Drop Electrode ◽  
Optimum Conditions ◽  
Mercury Drop Electrode ◽  
Working Electrode ◽  
Pulse Voltammetry ◽  
Unstirred Solution

Optimum conditions were found for the determination of 4-nitrobiphenyl by fast scan differential pulse voltammetry at a hanging mercury drop electrode in the concentration range 1 . 10-5 to 2 . 10-7 mol l-1. A further increase in sensitivity was attained by adsorptive accumulation of this substance on the surface of the working electrode, permitting determination in the concentration range (2 – 10) . 10-8 mol l-1 with one minute accumulation of the substance in unstirred solution or (2 – 10) . 10-9 mol l-1 with three-minute accumulation in stirred solution. Linear scan voltammetry can be used to determine 4-nitrobiphenyl in the concentration range (2 – 10) . 10-9 mol l-1 with five-minute accumulation in stirred solution, with the advantage of a smoother baseline and smaller interference from substances that yield only tensametric peaks.

scholarly journals Effect of Deposition Parameters on Electrochemical Properties of Polypyrrole-Graphene Oxide Films

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 624 ◽  
Author(s):  
Alina Iuliana Pruna ◽  
Nelly Ma. Rosas-Laverde ◽  
David Busquets Mataix
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Electrochemical Properties ◽  
Sodium Dodecyl ◽  
Hybrid Coatings ◽  
Deposition Parameters ◽  
Structure Morphology ◽  
Energy Storage Applications ◽  
Improved Performance ◽  
Sds Surfactant

Graphene oxide (GO)-modified polypyrrole (PPy) coatings were obtained by electrochemical methods in the presence of the anionic surfactant, sodium dodecyl sulfate (SDS). The structure, morphology, and electrochemical properties of the coatings were assessed by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM) and cyclic voltammetry at varying scan rates, respectively. The properties of the obtained coatings were analyzed with the GO and PPy loadings and electrodeposition mode. The hybrid coatings obtained galvanostatically showed a coarser appearance than those deposited by cyclic voltammetry CV mode and improved performance, respectively, which was further enhanced by GO and PPy loading. The capacitance enhancement can be attributed to the SDS surfactant that well dispersed the GO sheets, thus allowing the use of lower GO content for improved contribution, while the choice of suitable electrodeposition parameters is highly important for improving the applicability of GO-modified PPy coatings in energy storage applications.

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