scholarly journals Elektroplating Grafena-Polianilina pada Stainless Steel sebagai Elektroda pada Elektrolisis Air untuk Produksi Hidrogen

KOVALEN ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 109-120
Author(s):  
Rahmiani Gani ◽  
Syarifah Rabiatul Adawiah ◽  
Arfiani Nur
Keyword(s):  
Stainless Steel ◽  
Cyclic Voltammetry ◽  
Hydrogen Production ◽  
Reference Electrode ◽  
Water Electrolysis ◽  
Potential Difference ◽  
Peak Current ◽  
Working Electrode ◽  
Average Potential ◽  
Cyclic Voltammetry Method

Hydrogen production by water electrolysis can be optimalized by improve the working electrode. Stainless steel as working electrode was coated with graphene and polyaniline by using cyclic voltammetry method with Ag/AgCl as reference electrode and Pt as counter electrode. Coated electrodes were characterized by SEM-EDS and cyclic voltammetry method. Furthermore, the synthesized electrode was applied for water electrolysis by adding 1- 5 g/L NaHCO3. The characterization data showed that Stainless steel/Graphene-Polyaniline electrode can be synthesized by using cyclic voltammetry. The coating process was conducted at sweeping rate 10 mV/s on voltage -0.2 to 0.8 V for 10 cycles. The voltammograms showed that the highest cathodic peak current of electrolysis obtained at 0.491 mA by addition 2 g NaHCO3 on SS/G-PANi0,5 electrode, and the highest anodic peak current obtained at 0.191 mA by addition 2 g NaHCO3 on SS/G-PANi0,5 electrode. Based on the overpotential data, the smallest average potential difference of H+ adsorption obtained by SS/G-PANi1,0 electrode, and the smallest average potential difference of H+ desorption obtained by SS/G-PANi0,5 electrode. Keywords: Stainless steel, hydrogen production, electroplating, electrocatalyst, electrolysis

scholarly journals Cyclic voltammetry of samarium ions in the molten LiCl-KCl eutectic for diffusion coefficient analysis

2019 ◽  
Author(s):  
Vickram Singh ◽  
Christopher Bruneau ◽  
Dev Chidambaram
Keyword(s):  
Cyclic Voltammetry ◽  
Diffusion Coefficient ◽  
Surface Area ◽  
Electrode Surface ◽  
Measurement Errors ◽  
Current Response ◽  
High Concentration ◽  
Melt Temperature ◽  
Peak Current ◽  
Working Electrode

Cyclic voltammetry (CV) was used to investigate the electrochemical behavior of SmCl3 when it is solvated in the molten LiCl-KCl eutectic at 773 K. An experimental method obtained from the literature was adjusted to produce repeatable current responses attributed to the Sm3+/Sm2+ reaction couple and to determine working electrode surface area. The effect of solvating SmCl3 at high concentration was investigated as it relates to electrochemical reversibility and diffusion coefficient analysis. An electrochemically reversible region was identified using correlations between the current response and the scan rate along with peak current ratio measurements. In these, the reversibility was unaffected by increasing concentration. The correlation between current response and concentration was less linear than expected, suggesting the effects of additional modes of diffusion, solution resistance, and charge transfer kinetics may be contributing more at high concentrations. The measurement errors associated with peak current response, working electrode surface area, and melt temperature were used to estimate the associated uncertainties of the reported diffusion coefficients of Sm3+ in the molten LiCl-KCl eutectic. These diffusion coefficient values were found to be relatively consistent with values for Sm3+ reported in the literature for lower concentrations.

Electrochemical Treatment of Graphene

2019 ◽  
Vol 799 ◽  
pp. 197-202
Author(s):  
Alexander Usikov ◽  
Mike Puzyk ◽  
Sergey Novikov ◽  
Iosif Barash ◽  
Oleg Medvedev ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Partial Oxidation ◽  
Electrochemical Method ◽  
Counter Electrode ◽  
Reference Electrode ◽  
Electrochemical Treatment ◽  
Complete Dissolution ◽  
Graphene Films ◽  
Working Electrode ◽  
Electrode Cell

Treatment of graphene/SiC dies in inorganic electrolytes (KOH, KCl and Na2SO4) is discussed. An electrochemical method based on the cyclic voltammetry in a conventional three-electrode cell with Ag/AgCl reference electrode, a platinum counter electrode, and the graphene/SiC dies as working electrode (anode) is used for the treatment. It was observed either partial oxidation of graphene or its complete dissolution with the formation of CO2. The treatment performed resulted in the deterioration of the graphene films and change of the graphene-die resistivity depending on the range of the scanning potential applied to the graphene/SiC dies.

THE DEVELOPMENT OF GLUCOSE SENSOR BASED ON SiO2-CuO MATERIALS USING SCREEN PRINTED CARBON ELECTRODE (SPCE)

2016 ◽  
Vol 12 (1) ◽  
Author(s):  
Intan Frina Utamiyanti
Keyword(s):  
Cyclic Voltammetry ◽  
Glucose Sensor ◽  
Reference Electrode ◽  
Synthesis Process ◽  
Potential Range ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Cyclic Voltammetry Method ◽  
Cyclic Voltammetry Analysis ◽  
Screen Printed

<p>The development of material-based glucose sensor SiO<sub>2</sub>-CuO using Screen Printed Carbon Electrode (SPCE) had been done. Three types of materials were used to detect glucose, i.e Multi Wall Carbon Nanotube (MWCNT)-SiO2-CuO, SiO2-CuO (A) dan SiO2-CuO (B). The differences composition of SiO<sub>2</sub>-CuO(A) and SiO<sub>2</sub>-CuO(B) occurred during the addition of NaOH in synthesis process of SiO2-CuO (B). The prepared materials were analyzed by Scanning Electron Microscopy (SEM), cyclic voltammetry method and chrono-amperometry. Cyclic voltammetry analysis was conducted at a potential range of -1.0 - 1.5 V with Ag/AgCl as reference electrode. The scan rate was 100 mV/sec and the potential was varied at (-0.6), (-0.5) and (-0.4) V, in which the duration of each analysis was 5 second. Based on the result of analysis, whether by SEM, cyclic voltammetry and chrono-amperometry, the SiO<sub>2</sub>-CuO (B) was found to be the best material for detection of glucose.</p>

scholarly journals THE DEVELOPMENT OF GLUCOSE SENSOR BASED ON SiO2-CuO MATERIALS USING SCREEN PRINTED CARBON ELECTRODE (SPCE)

2016 ◽  
Vol 12 (1) ◽  
pp. 50
Author(s):  
Intan Frina Utamiyanti ◽  
Barlah Rumhayati ◽  
Ani Mulyasuryani
Keyword(s):  
Cyclic Voltammetry ◽  
Glucose Sensor ◽  
Reference Electrode ◽  
Synthesis Process ◽  
Potential Range ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Cyclic Voltammetry Method ◽  
Cyclic Voltammetry Analysis ◽  
Screen Printed

The development of material-based glucose sensor SiO<sub>2</sub>-CuO using Screen Printed Carbon Electrode (SPCE) had been done. Three types of materials were used to detect glucose, i.e Multi Wall Carbon Nanotube (MWCNT)-SiO2-CuO, SiO2-CuO (A) dan SiO2-CuO (B). The differences composition of SiO<sub>2</sub>-CuO(A) and SiO<sub>2</sub>-CuO(B) occurred during the addition of NaOH in synthesis process of SiO2-CuO (B). The prepared materials were analyzed by Scanning Electron Microscopy (SEM), cyclic voltammetry method and chrono-amperometry. Cyclic voltammetry analysis was conducted at a potential range of -1.0 - 1.5 V with Ag/AgCl as reference electrode. The scan rate was 100 mV/sec and the potential was varied at (-0.6), (-0.5) and (-0.4) V, in which the duration of each analysis was 5 second. Based on the result of analysis, whether by SEM, cyclic voltammetry and chrono-amperometry, the SiO<sub>2</sub>-CuO (B) was found to be the best material for detection of glucose.

scholarly journals Preparation and Application of Platinum Composite Microelectrode (PCM) for the Routine Analysis of Acetaminophen in Pharmaceutical Products

2014 ◽  
Vol 14 (2) ◽  
pp. 109-115
Author(s):  
Riyanto Riyanto ◽  
Ahmad Safarudin
Keyword(s):  
Stainless Steel ◽  
Cyclic Voltammetry ◽  
Counter Electrode ◽  
Low Cost ◽  
Reference Electrode ◽  
Pharmaceutical Products ◽  
Pharmaceutical Product ◽  
Additional Benefit ◽  
Routine Analysis ◽  
Steel Mould

Preparation and application of platinum composite microelectrode (PCM) for the routine analysis of acetaminophen in pharmaceutical products has been carried out. This electrode was prepare by Pt powder and PVC in 4 mL tetrahydrofuran (THF) solvent and swirled flatly to homogeneous followed by drying in an oven at 100 °C for 3 h. The mixture was placed in 0.5 cm diameter stainless steel mould and pressed at 10 ton/cm2. The cyclic voltammetry were performed in a three electrodes system using PCM as a working electrode, an Ag/AgCl (saturated KCl) as reference electrode and platinum wire as the counter electrode. Electroanalysis of acetaminophen was performed in 0.1 M H2SO4 as an electrolyte. The result of the study showed that the correlation of determination using PCM electrode for electroanalysis acetaminophen was R2 = 0.999. Precision, recovery, LOD and LOQ of the PCM towards acetaminophen were found to be 1.04%, 100.54%, 19.52 mg/L and 65.08 mg/L, respectively. As a conclusion, the methods can be used for routine analysis of acetaminophen in pharmaceutical product. Simplicity of sample preparation and use of low cost reagents are the additional benefit of this method.

scholarly journals Homogeneous electron-transfer of chlorophyll and its derivative chlorophyllin at gold electrode

2019 ◽  
Vol 7 (1) ◽  
pp. 1-17
Author(s):  
Alhasan H ◽  
Alahmadi N ◽  
Wadhawan J
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Electrode Surface ◽  
Gold Electrode ◽  
Reference Electrode ◽  
Surface Preparation ◽  
Active Species ◽  
Bulk Solution ◽  
Photovoltaic Properties ◽  
Working Electrode

Introduction: Chlorophyll is a light harvesting pigment, which absorbs light in the visible spectrum of sunlight and promotes electron transfer, Chlorophyllin (CHL) is One of the most important derivative molecules of chlorophyll. Nowadays, chlorophyll pigment and its derivatives are utilised in organic photosynthetic solar cells for their desirable photovoltaic properties. Cyclic voltammetry (CV) is an essential technique. It is extensively used to study electroactive species to interpret the intermediates of reactions, supply information about the thermodynamics of oxidation-reduction reactions and elucidate the kinetics of electron transfer reactions. Materials and Methods: Prior to the electrochemical study, the working gold (Au) electrode surface was prepared by immersing it in the various concentrations of chlorophyllin for a period time. The electrolyte was degassed by using N2 for approximately 30 minutes inside a Faraday cage before any electrochemical experiment was performed. A three electrode system was used with, Ag/AgCl as a reference electrode, graphiteas a counter and the working electrode (Au). Results and Discussion: As a route to develop new chemical systems for artificial photosynthesis, this work reports the effectiveness of different parameters in transferring electrons between chlorophyllin (CHL) pigment and the working electrode surface (gold). These parameters such as the adsorption time, the electrolyte nature and concentration and chlorophyllin concentration are investigated. The use of chlorophyllin as a redox mediator is examined, with a gold electrode being employed. The importance of gold electrode surface preparation in determining the mechanism of redox is described, and the environment of adsorption process of the different concentrations of chlorophyllin on the surface of the gold electrode has been elucidated in this study. Conclusiones: The electrochemical method showed that the cyclic voltammetry responses of studied adsorption chlorophyllin pigment on the gold electrode were more efficient. In addition, the redox reaction was successful electrochemically in aqueous solution thanthe organic solution. It was suggested that electrons reduce to the chlorophyllin pigment by adding active species in the bulk solution homogeneous transfer. Finally, detections of chl on spinach leaves using various methods are reported.

scholarly journals Utilization of carbon nanotubes in hydrogen electrosynthesis from tropical fruit fermentation

2020 ◽  
Vol 25 (3) ◽  
Author(s):  
Adriana Carla de Oliveira Lopes ◽  
Fabiane Caxico de Abreu
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Production ◽  
Fossil Fuels ◽  
Oil And Gas ◽  
Reference Electrode ◽  
Hydrogen Gas ◽  
Household Waste ◽  
Vitreous Carbon ◽  
Tropical Fruit ◽  
Working Electrode

ABSTRACT The use of fossil fuels, especially oil and gas, has accelerated in recent years, resulting in the global energy crisis. The fermentative biological process is a sustainable way to produce hydrogen, as it can use as a substrate various types of carbohydrate-rich industrial and household waste such as fruit, minimizing but not completely eliminating the problems caused by improper disposal of this material. From a perspective of energy conservation and use of renewable sources for energy generation, this work aims to contribute to the identification of the use of a currently unused portion of energy, optimizing hydrogen production from a fuel cell. microbial. The main nanomaterial used in electrolysis was carbon nanotubes (CNT) incorporated into carbon felt (CF). Cyclic voltammetry studies were also performed on three electrode systems: vitreous carbon electrode as working electrode, platinum electrode as auxiliary electrode and Ag / AgCl / Cl- as reference electrode. An electrochemical cell formed by two separate compartments was constructed. Before starting the electrolysis experiment, an experimental design was performed using the complete factorial design technique to analyze the influence of the variables selected for this study. The independent variables selected were: Tropical fruit liquor concentration in %v/v, type of working electrode, electrolysis time and pH of the electrolyte medium. The observed variable was the concentration in% v / v of the hydrogen gas obtained in the electrolysis. After the results of the tests, it was concluded that carbon nanotubes can be used as working electrode, presenting success in the hydrogen production process and that the pH of the electrolytic medium has a strong influence on this process. The present work was concluded presenting an alternative way in the production of a renewable energy source.

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