Impedance Spectra Analysis of Glassy Carbon / (Polypyrrole + Polystyrene Sulfonate) Electrodes by Using a Modified Randles Equivalent Circuit with a Constant Phase Element

2021 ◽  
Vol 100 (1) ◽  
pp. 3-12
Author(s):  
Walter Torres ◽  
Miguel Angel Carabali
Keyword(s):  
Equivalent Circuit ◽  
Glassy Carbon ◽  
Constant Phase Element ◽  
Impedance Spectra ◽  
Polystyrene Sulfonate ◽  
Spectra Analysis

scholarly journals ASSESMENT OF DAMAGE OF SOLAR HETEROJUNCTION a-SiC/c-Si INDUCED BY NEUTRON RADIATION

2020 ◽  
Vol 6 (1) ◽  
pp. 10-14
Author(s):  
Milan Perný ◽  
Vladimír Šály ◽  
Mirioslav Mikolášek ◽  
František Janíček ◽  
Vladimír Kujan ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Neutron Fluence ◽  
Characteristic Impedance ◽  
Neutron Radiation ◽  
Structural Defects ◽  
Impedance Spectra ◽  
Font Size ◽  
Heterojunction Structure ◽  
Trapping Mechanism ◽  
Electronic Elements

<span style="font-family: 'Times New Roman',serif; font-size: 10pt; -ms-layout-grid-mode: line; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-GB; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-bidi-font-style: italic; mso-bidi-font-weight: bold;" lang="EN-GB">Amorphous silicon carbide is known as a material resistant except others influences also against radiation. This study investigates the effects of neutron radiation on electric characteristics (<em>I</em>-<em>V</em> characteristic, impedance spectra and obtained dynamic parameters of AC equivalent circuit) of solar cell a-SiC/c-Si heterojunction structure. The heterojunction structure was irradiated using neutrons with neutron fluence 10<sup>13</sup> cm<sup>-2</sup>. Existence of neutron induced structural defects, which could be introduced within semiconductor structure of heterojunction, has been illustrated using DC and AC analysis. </span><span style="font-family: 'Times New Roman',serif; font-size: 10pt; -ms-layout-grid-mode: line; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-bidi-font-style: italic; mso-bidi-font-weight: bold;" lang="EN-US">The structural defects induced by neutron particles radiation affect mainly trapping mechanism. The process results in the changes of electronic elements included into proposed equivalent circuit.</span>

Synthesis, Electrical Properties and Chemical Stability of BaCe0.7In0.3-xGdxO3-δ

2016 ◽  
Vol 848 ◽  
pp. 401-410 ◽  
Author(s):  
Jia Huan Xu ◽  
Wei Han ◽  
Hui Ding ◽  
Wei Jin Chen ◽  
Jun Xiang
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Chemical Stability ◽  
Perovskite Structure ◽  
Doping Concentration ◽  
Interplanar Spacing ◽  
Sol Gel ◽  
Impedance Spectra ◽  
Spectra Analysis ◽  
Diffraction Angle

In3+, Gd3+ were selected as substitution elements for Ce4+ in order to increase electrical conductivity and chemical stability of BaCeO3. A modified sol-gel method was used to fabricate BaCe0.7In0.3-xGdxO3-δ (x = 0, 0.1, 0.2, 0.3) nanopowders. XRD results indicated that the diffraction angle moved to lower with increase of the Gd3 + doping concentration, so that the interplanar spacing gradually increased. The impedance spectra analysis showed that conductivity first increased (x = 0~0.2) and then decreased with the Gd3 + doping increase. The total conductivities at 800oC were 3.8 × 10-3 S·cm-1 (x = 0), 8.0 × 10-3 S· cm-1 (x = 0.1), 2.5 × 10-2 S· cm-1 (x = 0.2), 1.36 × 10-2 S ·cm-1 (x = 0.3). Chemical stability test in CO2 show that all samples except for x=0.3 sample calcination at 800oC for 2h under 100% CO2 and x=0, 0.1 samples heating in boiling water for 12h kept main perovskite structure. Therefore, x=0.1 sample show better electrical conductivity and chemical stability.

scholarly journals Detection of xanthine in food samples with an electrochemical biosensor based on PEDOT:PSS and functionalized gold nanoparticles

RSC Advances ◽  
2020 ◽  
Vol 10 (59) ◽  
pp. 36147-36154
Author(s):  
M. Z. H. Khan ◽  
M. S. Ahommed ◽  
M. Daizy
Keyword(s):  
Gold Nanoparticles ◽  
Glassy Carbon ◽  
Electrochemical Biosensor ◽  
Food Samples ◽  
Sensitive Detection ◽  
Carbon Electrodes ◽  
Polystyrene Sulfonate ◽  
Host Matrix ◽  
Glassy Carbon Electrodes ◽  
Functionalized Gold Nanoparticles

An innovative biosensor with glassy carbon electrodes modified with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate nanocomposites as a host matrix with functionalized gold nanoparticles for the selective and sensitive detection of xanthine.

Impedance spectra analysis of thermoresponsive poly(acryloyl-L-proline methyl ester) gel membrane in LiCl solution

2005 ◽  
Vol 43 (20) ◽  
pp. 2843-2851
Author(s):  
Jinhua Chen ◽  
Masaharu Asano ◽  
Norio Tsubokawa ◽  
Yasunari Maekawa ◽  
Tetsuya Yamaki ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Impedance Spectra ◽  
Spectra Analysis

scholarly journals Electrochemical Characteristics of Particulate Matter

2011 ◽  
Vol 7 (-1) ◽  
pp. 19-26 ◽  
Author(s):  
Margarita Baitimirova ◽  
Agnese Osite ◽  
Juris Katkevich ◽  
Arturs Viksna
Keyword(s):  
Particulate Matter ◽  
Double Layer ◽  
Mass Concentration ◽  
Electrochemical Impedance ◽  
Cyclic Voltammograms ◽  
Electrochemical Characteristics ◽  
Impedance Spectra ◽  
Double Layer Capacitance ◽  
Spectra Analysis ◽  
Aerosol Mass Concentration

Electrochemical Characteristics of Particulate Matter The current work is dedicated to electrochemical impedance spectra analysis of the fine and coarse airborne particulate matter sampled on the glass fibre filters in Riga city air. The cyclic voltammograms, impedance spectra and double layer capacitance spectra of particulate matter were obtained after the pre-treatment of samples. The equivalent circuit method and the statistical method were used for impedance spectra analysis. Analyzing the impedance spectra, it was concluded that the impedance of both - fine and coarse particles heated in N2 flow does not change by aerosol mass concentration variations. On the other hand, the impedance of particulate matter heated in O2 flow increases, by increasing PM10 mass concentration. Describing the spectra of double layer capacitance, it was observed that the double layer capacitance of aerosols heated in N2 flow did not change, by mass concentration and size variations. However, by increasing mass concentration of coarse aerosols heated in O2 flow, the double layer capacitance reduced.

scholarly journals Impedance, Electrical Equivalent Circuit (EEC) Modeling, Structural (FTIR and XRD), Dielectric, and Electric Modulus Study of MC-Based Ion-Conducting Solid Polymer Electrolytes

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 170
Author(s):  
Balen K. Faris ◽  
Ary A. Hassan ◽  
Shujahadeen B. Aziz ◽  
Mohamad A. Brza ◽  
Aziz M. Abdullah ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Structural Changes ◽  
Dc Conductivity ◽  
Solid Polymer Electrolytes ◽  
Electrical Impedance Spectroscopy ◽  
Solid Polymer ◽  
Electrolyte System ◽  
Electrical Equivalent Circuit ◽  
Spectra Analysis ◽  
Ion Conducting

The polymer electrolyte system of methylcellulose (MC) doped with various sodium bromide (NaBr) salt concentrations is prepared in this study using the solution cast technique. FTIR and XRD were used to identify the structural changes in solid films. Sharp crystalline peaks appeared at the XRD pattern at 40 and 50 wt.% of NaBr salt. The electrical impedance spectroscopy (EIS) study illustrates that the loading of NaBr increases the electrolyte conductivity at room temperature. The DC conductivity of 6.71 × 10−6 S/cm is obtained for the highest conducting electrolyte. The EIS data are fitted with the electrical equivalent circuit (EEC) to determine the impedance parameters of each film. The EEC modeling helps determine the circuit elements, which is decisive from the engineering perspective. The DC conductivity tendency is further established by dielectric analysis. The EIS spectra analysis shows a decrease in bulk resistance, demonstrating free ion carriers and conductivity boost. The dielectric property and relaxation time confirmed the non-Debye behavior of the electrolyte system. An incomplete semicircle further confirms this behavior model in the Argand plot. The distribution of relaxation times is related to the presence of conducting ions in an amorphous structure. Dielectric properties are improved with the addition of NaBr salt. A high value of a dielectric constant is seen at the low frequency region.

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