scholarly journals CHLORIDE SENSOR FABRICATION BASED ON SPE Ag/AgCl THROUGH CYCLIC VOLTAMMETRIC TECHNIQUE: SCAN RATE EFFECT

SINERGI ◽  
2021 ◽  
Vol 25 (3) ◽  
pp. 351
Author(s):  
Mas'ud Asadullah ◽  
Sagir Alva ◽  
Ali Rinaldi ◽  
Rita Sundari
Keyword(s):  
Selectivity Coefficient ◽  
Rate Effect ◽  
Fabrication Process ◽  
Cyclic Voltammetric ◽  
Ion Sensor ◽  
Validation Test ◽  
Lifetime Test ◽  
Sensor Fabrication ◽  
Two Samples ◽  
Scan Rate

The Cyclic Voltammetric (CV) technique is one of the Ag/AgCl fabrication processes. In electrochemical processes using this CV technique, the microstructure of the surface of a substrate or electrode can affect the scan rate. Thus, this study aims to identify the scan rate effect of the Cl-ion sensor fabrication process using the CV technique on the performance of the Cl-ion sensor. First, the CV process was carried out in one cycle to grow the AgCl layer on the Ag surface. Then, this process was carried out at varied scan rates of 20, 40, 60, 80, and 100 mV/s. After completing the Ag/AgCl fabrication process, it was followed by the characterization process, selectivity coefficient test, lifetime test, and validation test to compare the test results of the Cl SPE Ag/AgCl ion sensor with Ag/AgCl commercial. The results showed that the optimum Cl-ion sensor response was obtained at the scan rate of 60 mV/s. Then, based on the validation test, the Cl-ion in the two samples did not show significant differences. Therefore, it indicates that the SPE Ag/AgCl ion sensor has the same performance as the Ag/AgCl commercial.

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).

Selenium(IV) Electrochemistry on Silver: A Combined Electrochemical Quartz-Crystal Microbalance and Cyclic Voltammetric Investigation

2003 ◽  
Vol 68 (9) ◽  
pp. 1579-1595 ◽  
Author(s):  
Giovanni Pezzatini ◽  
Francesca Loglio ◽  
Massimo Innocenti ◽  
Maria Luisa Foresti
Keyword(s):  
Cyclic Voltammetry ◽  
Quartz Crystal Microbalance ◽  
Electrochemical Behavior ◽  
Quartz Crystal ◽  
Reduction Process ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Potential Range ◽  
Cyclic Voltammetric ◽  
Scan Rate ◽  
Process Of Se

The electrochemical behavior of Se(IV) on silver was investigated by cyclic voltammetry and electrochemical quartz-crystal microbalance (EQCM) measurements. As already reported in the literature, Se(IV) electrochemistry is always complex, and on silver even more, due to the formation of a compound. Our results confirm that the reduction process of Se(IV) occurs through two reaction paths, Se(IV) → Se(0) and Se(IV) → Se(-II); the product Se(-II) then reacts with Se(IV) through a comproportionation reaction. The latter step leads to red Se that, according to the literature, is the only electroactive form of Se(0). The presence of the electroactive red Se is evident both in the negative range of potentials, through the reduction Se(0) → Se(-II), and in the less negative range of potentials, through the oxidation Se(0) → Se(IV). Moreover, our measurements pointed to the formation of a deposit that never redissolves. This deposit seems to be the electroinactive gray Se. The electrochemical behavior of Se(IV) was investigated in the whole potential range accessible on silver. Our results confirm the occurrence of competitive processes whose predominance depends on the scan rate, as well as on the potential limits of voltammetry. A detailed table with the processes occurring in different potential ranges was drawn up.

scholarly journals In Situ Construction of ZnO/Ni2S3 Composite on Ni Foam by Combing Potentiostatic Deposition with Cyclic Voltammetric Electrodeposition

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 829
Author(s):  
Sa Lv ◽  
Peiyu Geng ◽  
Huan Wang ◽  
Fan Yang ◽  
Jia Yang ◽  
...  
Keyword(s):  
Active Sites ◽  
Coulombic Efficiency ◽  
Electrochemical Characteristics ◽  
Cyclic Stability ◽  
Ni Foam ◽  
Cyclic Voltammetric ◽  
Potentiostatic Deposition ◽  
Scan Rate

The ZnO/Ni2S3 composite has been designed and in situ synthesized on Ni foam substrate by two steps of electrodeposition. ZnO was achieved on Ni foam by a traditional potentiostatic deposition, followed by cyclic voltammetric (CV) electrodeposition, to generate Ni2S3, where the introduction of ZnO provides abundant active sites for the subsequent Ni2S3 electrodeposition. The amount of deposit during CV electrodeposition can be adjusted by setting the number of sweep segment and scan rate, and the electrochemical characteristics of the products can be readily optimized. The synergistic effect between the ZnO as backbones and the deposited Ni2S3 as the shell enhances the electrochemical properties of the sample significantly, including a highly specific capacitance of 2.19 F cm−2 at 2 mA cm−2, good coulombic efficiency of 98%, and long-term cyclic stability at 82.35% (4000 cycles).

scholarly journals Facile Synthesis Mn2O3 Nanorod Arrays: A Significant Material for Supercapacitor Electrode Application

2021 ◽  
Author(s):  
S Nelson Amirtharaj ◽  
M. Mariappan
Keyword(s):  
Specific Capacitance ◽  
Maximum Energy ◽  
Ammonium Bromide ◽  
Sonochemical Method ◽  
Nanorod Arrays ◽  
Galvanostatic Charge ◽  
Supercapacitor Electrode ◽  
Cyclic Voltammetric ◽  
Scan Rate ◽  
Charge Discharge

Abstract Mn2O3 is a significant candidate for various applications. In the present work, the Mn2O3 nanorod arrays have been successfully prepared through facile sonochemical method with the aid of cetyl trimethyl ammonium bromide (CTAB) template. The crystalline phase and bonding properties have ben confirmed through X-ray diffraction analysis (XRD) and Fourier transform infrared (FTIR) spectroscopic analysis. The electrochemical properties were analysed through various techniques such as cyclic voltammetric and galvanostatic charge/discharge analysis. Interestingly, cyclic voltammetric (CV) curves confirms the electric double layer capacitor-based charge storage mechanism and it render the maximum specific capacitance of 647 Fg-1 at a scan rate 5 mVs-1 whereas the galvanostatic charge/discharge studies offer the specific capacitance of 656 Fg-1 at a current density of 1 Ag-1. The Mn2O3 nanorod arrays provide the maximum energy and power densities of 91.1 Wh Kg-1 and 14985 Wkg-1 respectively. In addition, the cyclic stability analysis exhibit only 12 % initial capacitance degradation over 3000 CV cycles at a scan rate of 100 mVs-1. The hopeful outcomes demonstrate the significant of the Mn2O3 nanorod arrays as electrode material for supercapacitor devices.

FESEM-EDX and CV Characteristics of Dopant (Mn, Co, Ni) Magnesium Ferrites

2013 ◽  
Vol 645 ◽  
pp. 150-153
Author(s):  
Siti Soleha Jonit ◽  
Madzlan Aziz ◽  
Rita Sundari
Keyword(s):  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Carbon Electrode ◽  
Magnesium Ferrite ◽  
Cyclic Voltammetric ◽  
X Ray ◽  
Screen Printed Carbon Electrode ◽  
Scan Rate ◽  
Poly Vinylidene Fluoride ◽  
Mn Doped

Doping magnesium ferrites (MgFe2 O4) with Mn, Co and Ni, which were synthesized by sol gel method using citric acid and polyvinyl alcohol (P VA) and calcined at 500oC, showed interesting electrochemical featur es based on their cyclic voltammetric (CV) characteristics using 5 µL ferrite – poly vinylidene fluoride in ethano l deposited on a screen printed carbon electrode (SPCE) in a mixture of 1.0 M KOH and ferricyanide solution recorded with a scan rate of 0.02 Vs -1. The Mn doped magnesium ferrite (x = 0.9) showed the most remarkable CV performance over other doped element (Co and Ni) and un-doped magnesiu m ferrites. The surface morphology of doped ferrites was studied by applying a field emissi on scanning electron microscope (FESEM) in conjunction with an energy dispersive X-ray spect roscopy (EDX) analysis. The results revealed that Mn posed the highest percentage on the surface ( ≈ 21.5 %), followed by Co (≈ 19.5%) and Ni ( ≈ 6.7%) with respect to x = 0.9 of M0.9Mg0.1Fe 2 O4 (M = Co, Mn and Ni) at 500oC calcination. The study showed the possibility of yielding semi conducting ferrites using own fabricated magnesium ferrite and its metal doping.

scholarly journals CuCrO4 Nanoparticles Composite Modified Carbon Paste Electrodes for Sensitive Detection of Paracetamol: A Cyclic Voltammetric Study

2021 ◽  
Author(s):  
PRIYANKA S R ◽  
Latha K.P
Keyword(s):  
Carbon Paste Electrode ◽  
Experimental Studies ◽  
Current Response ◽  
Carbon Paste ◽  
Linear Calibration ◽  
Cyclic Voltammetric ◽  
Cyclic Voltammetric Study ◽  
Limit Value ◽  
Scan Rate ◽  
Paste Electrode

Abstract An electrochemical sensor containing carbon paste electrode (CPE) for paracetamol is developed and modified with the CuCrO4 Nanocomposites. The synthesised CuCrO4 Nanocomposites was discussed with X-Ray Diffraction studies. Experimental studies such as scan rate, concentration and pH was studied by using cyclic voltammetric method. The CuCrO4 Nanocomposites modified CPE (CuCrO4 Nanocomposites MCPE) exhibited excellent electrocatalytic response towards the oxidation of paracetamol (PC). Over potential for oxidation of PC was minimised which considerably enhance the current response on the CuCrO4 Nanocomposites MCPE when compared with bare carbon paste electrode (BCPE). Scan rate study for PC discuss the process of the electrode. Linear calibration curve was obtained with the range of 2 μM to 14 μM having the detection limit and quantification limit value of PC is discussed with CuCrO4 Nanocomposites MCPE. This study shows that electrochemical oxidation of PC at CuCrO4 Nanocomposites MCPE is pH dependent process.

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