Electrochemical storage properties of polyaniline-, poly(N-methylaniline)-, and poly(N-ethylaniline)-coated pencil graphite electrodes

2014 ◽  
Vol 68 (4) ◽  
Author(s):  
Andac Arslan ◽  
Evrim Hur
Keyword(s):  
Polymer Films ◽  
Electrochemical Impedance ◽  
Film Coating ◽  
Specific Power ◽  
Pencil Graphite Electrode ◽  
Graphite Electrodes ◽  
Electrochemically Deposited ◽  
Electrochemical Storage ◽  
Discharge Capacities ◽  
Supercapacitor Applications

AbstractThree types of conducting polymers, polyaniline (PANI), poly(N-methylaniline) (PNMA), poly(N-ethylaniline) (PNEA) were electrochemically deposited on pencil graphite electrode (PGE) surfaces characterized as electrode active materials for supercapacitor applications. The obtained films were electrochemically characterized using different electrochemical methods. Redox parameters, electro-active characteristics, and electrostability of the polymer films were investigated via cyclic voltammetry (CV). Doping types of the polymer films were determined by the Mott-Schottky method. Electrochemical capacitance properties of the polymer film coating PGE (PGE/PANI, PGE/PNMA, and PGE/PNEA) were investigated by the CV and potentiostatic electrochemical impedance spectroscopy (EIS) methods in a 0.1 M H2SO4 aqueous solution. Thus, capacitance values of the electrodes were calculated. Results show that PGE/PANI, PGE/PNMA, and PGE/PNEA exhibit maximum specific capacitances of 131.78 F g−1 (≈ 436.50 mF cm−2), 38.00 F g−1 (≈ 130.70 mF cm−2), and 16.50 F g−1 (≈ 57.83 mF cm−2), respectively. Moreover, charge-discharge capacities of the electrodes are reported and the specific power (SP) and specific energy (SE) values of the electrodes as supercapacitor materials were calculated using repeating chronopotentiometry.

Electrochemical Characterisation of Poly(aniline-co-N-methylaniline) and Poly(aniline-co-N-ethylaniline) Films on Pencil Graphite Electrode for Supercapacitor Applications

2013 ◽  
Vol 66 (7) ◽  
pp. 825 ◽  
Author(s):  
Andac Arslan ◽  
Evrim Hur
Keyword(s):  
Specific Capacitance ◽  
Low Voltage ◽  
Electrochemical Impedance ◽  
Graphite Electrode ◽  
Pencil Graphite Electrode ◽  
Supercapacitor Electrode ◽  
Copolymer Films ◽  
Electrochemical Storage ◽  
Supercapacitor Applications ◽  
Poly Aniline

In this work, poly(aniline-co-N-methylaniline) (co-PNMA) and poly(aniline-co-N-ethylaniline) (co-PNEA) have been electrochemically synthesised on pencil graphite electrode (PGE) surface to use as an electrode material for supercapacitors. The films have been formed from aqueous solution of monomers and sulfuric acid as electrolyte. The copolymer films have been characterised by cyclic voltammetry (CV), Mott-Schottky (MS) analysis, and scanning electron microscopy (SEM). The electrochemical storage properties of uncoated electrode and copolymer coated electrodes (PGE/co-PNMA and PGE/co-PNEA) have been investigated via CV, electrochemical impedance spectroscopy (EIS), and repeating chronopotentiometry (RCP) methods in 0.100 M H2SO4 solution. Experimental results indicate that PGE/co-PNMA exhibits higher specific capacitance than PGE/co-PNEA. Highest specific capacitance values of the PGE/co-PNMA and PGE/co-PNEA have been obtained as 213.85 mF g–1 (17.7 mF cm–2) and 48.60 mF g–1 (4.36 mF cm–2) at 50 mV s–1, respectively when compared with that of uncoated PGE which is 1.63 mF g–1 (0.14 mF cm–2). Charge-discharge characteristics of the electrodes have shown that both of the electrodes can be used as supercapacitor electrode active materials for low voltage (<10 V) applications.

Cobalt ion-doped polyaniline, poly(N-methylaniline), and poly(N-ethylaniline): electrosynthesis and characterisation using electrochemical methods in acidic solutions

2014 ◽  
Vol 68 (11) ◽  
Author(s):  
Evrim Hur ◽  
Andac Arslan
Keyword(s):  
Low Voltage ◽  
Electrochemical Impedance ◽  
Active Material ◽  
Electrochemical Methods ◽  
Pencil Graphite Electrode ◽  
Cobalt Ion ◽  
Acidic Solutions ◽  
Doped Polyaniline ◽  
Eis Measurements ◽  
Supercapacitor Applications

AbstractCobalt ion (Co2+)-doped polyaniline (PANI-Co), poly(N-methylaniline) (PNMA-Co), and poly(N-ethylaniline) (PNEA-Co) films were synthesised electrochemically on a pencil graphite electrode (PGE) and their electrochemical properties were investigated for supercapacitor applications. The polymer film-coated electrodes (PGE/PANI-Co, PGE/PNMA-Co, and PGE/PNEA-Co) thus obtained were characterised by scanning electron microscopy (SEM) and different electrochemical methods. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements were employed in 0.1 M H2SO4 solution to calculate the specific capacitance (C S) values of the electrodes. The maximum C S of 192.94 F g−1, 139.83 F g−1, and 47.12 F g−1 were achieved for PGE/PANI-Co, PGE/PNMA-Co, and PGE/PNEA-Co at 1 mV s−1, respectively. On the other hand, the charge/discharge stability of the electrodes was analysed using the repeating chronopotentiometry (RCP) method. The RCP measurements indicate that the electrodes could be used as an electrode active material for low voltage supercapacitor applications.

scholarly journals Electrochemical Investigation of Curcumin–DNA Interaction by Using Hydroxyapatite Nanoparticles–Ionic Liquids Based Composite Electrodes

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4344
Author(s):  
Merve Uca ◽  
Ece Eksin ◽  
Yasemin Erac ◽  
Arzum Erdem
Keyword(s):  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Dna Interaction ◽  
Composite Electrodes ◽  
Hydroxyapatite Nanoparticles ◽  
Graphite Electrodes ◽  
X Ray ◽  
Pulse Voltammetry ◽  
Polymerase Chain

Hydroxyapatite nanoparticles (HaP) and ionic liquid (IL) modified pencil graphite electrodes (PGEs) are newly developed in this assay. Electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and cyclic voltammetry (CV) were applied to examine the microscopic and electrochemical characterization of HaP and IL-modified biosensors. The interaction of curcumin with nucleic acids and polymerase chain reaction (PCR) samples was investigated by measuring the changes at the oxidation signals of both curcumin and guanine by differential pulse voltammetry (DPV) technique. The optimization of curcumin concentration, DNA concentration, and the interaction time was performed. The interaction of curcumin with PCR samples was also investigated by gel electrophoresis.

scholarly journals Online diagnosis of supercapacitors using extended Kalman filter combined with PID corrector

2021 ◽  
Vol 12 (3) ◽  
pp. 1521
Author(s):  
Zoubida Bououchma ◽  
Jalal Sabor
Keyword(s):  
Electrochemical Impedance ◽  
New Method ◽  
Specific Power ◽  
Attractive Alternative ◽  
State Of Health ◽  
Energy Storage Devices ◽  
Good Efficiency ◽  
Storage Devices ◽  
Online Identification ◽  
Identification Method

<span>Supercapacitors are electrical energy storage devices with a high specific power density, a long cycle life and a good efficiency, which make them attractive alternative storage devices for various applications. However, supercapacitors are subject to a progressive degradation of their perfor-mance because of aging phenomenon. Therefore, it is very important to be able to estimate their State-of-Health during operation. Electrochemical Impedance Spectroscopy (EIS) is a very recog-nized technique to determine supercapacitors’ state-of-health. However, it requires the interrup-tion of system operation and thus cannot be performed in real time (online). In this paper, a new online identification method is proposed based on extended Kalman observer combined with a complementary PID corrector. The proposed method allows to accurately estimating supercapacitor resistance and capacitance, which are the main indicators of supercapacitor state-of-health. The new online identification method was applied for two voltage/current profiles using two different supercapacitors. The resistance/capacitance estimated by the new method and the conventional EKF were compared with those obtained by an experimental offline method. In comparison with conventional EKF, the capacitance obtained by the new method is significantly more accurate.</span>

scholarly journals Dependence of Capacitive Properties of an EDLC on Exfoliation Time of Graphite Electrodes

2021 ◽  
Author(s):  
Dinithi S. K. Rajaguru ◽  
Kamal Vidanapathirana ◽  
Kumudu S. Perera
Keyword(s):  
Electrochemical Impedance ◽  
Low Cost ◽  
Gel Polymer Electrolyte ◽  
Storage Device ◽  
Graphite Electrodes ◽  
Discharge Capacitance ◽  
Capacitive Properties ◽  
Device Applications ◽  
Specific Discharge ◽  
Electrochemical Double Layer

Abstract The scientific focus has been directed through the production and application of ‘wonder material- graphene’ after its discovery in 2004. But the mass production cost has become a huge disadvantage towards commercializing graphene based manufactures. As alternative low cost material, exfoliated graphite (EG) has emerged to be a novel nanostructured carbon material with a potential for electrochemical energy storage device applications owed to its unique characteristics similar to graphene. In this study a series of EG samples were prepared by a surfactant mediated liquid phase exfoliation method by changing the exfoliation time. Electrochemical double layer capacitors (EDLCs) were fabricated using different EG samples as an electrode material and a gel polymer electrolyte (GPE). They were characterized by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and galvanostatic charge discharge (GCD) techniques. EDLC having EG electrodes of 10 h exfoliation time showed the highest results with single electrode specific capacitance (Csc) of 4.12 F g− 1, single electrode specific discharge capacitance (Csd) of 1.10 F g− 1 and relaxation time of 0.22 s from CV, GCD and EIS respectively.

Estimation of Li-Ion Diffusion Coefficients in C60 Coated Si Thin Film Anodes Using Electrochemical Techniques

2012 ◽  
Vol 326-328 ◽  
pp. 87-92 ◽  
Author(s):  
Arenst Andreas Arie ◽  
Joong Kee Lee
Keyword(s):  
Thin Films ◽  
Diffusion Coefficients ◽  
Electrochemical Impedance ◽  
Silicon Film ◽  
Electrochemical Techniques ◽  
Lithium Ion ◽  
Chemical Vapor ◽  
Film Coating ◽  
Kinetic Properties ◽  
Silicon Thin Films

C60coated Si thin films were prepared sequentially by a plasma enhanced chemical vapor deposition and a plasma assisted thermal evaporation technique. The films were then utilized as anode materials for lithium ion batteries. The diffusion coefficients of Li-ions in the film electrodes were then estimated by typical electrochemical techniques such as cyclic voltammetry and electrochemical impedance spectroscopy. The diffusion coefficients determined by both methods were found to be consistent each other. The diffusion coefficient of coated samples was obviously higher than that of bare silicon thin films, indicated that the kinetic properties of lithium ion transport in silicon film electrodes were enhanced by the C60film coating on its surface.

scholarly journals Studies on Dynamic Properties of Ultracapacitors Using Infinite r–C Chain Equivalent Circuit and Reverse Fourier Transform

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4583
Author(s):  
Shailendra Rajput ◽  
Alon Kuperman ◽  
Asher Yahalom ◽  
Moshe Averbukh
Keyword(s):  
Mathematical Model ◽  
Fourier Transform ◽  
Equivalent Circuit ◽  
Dynamic Behavior ◽  
Double Layer ◽  
Electrochemical Impedance ◽  
Dynamic Properties ◽  
Internal Resistance ◽  
Simulation Software ◽  
Specific Power

The specific power storage capabilities of double-layer ultracapacitors are receiving significant attention from engineers and scientific researchers. Nevertheless, their dynamic behavior should be studied to improve the performance and for efficient applications in electrical devices. This article presents an infinite resistor–capacitor (r–C) chain-based mathematical model for the analysis of double layer ultracapacitors. The internal resistance and capacitance were measured for repetitive charging and discharging cycles. The magnitudes of internal resistance and capacitance showed approximately ±10% changes for charge-discharge processes. Electrochemical impedance spectroscopy investigations revealed that the impedance of a double-layer ultracapacitor does not change significantly in the temperature range of (−30 °C to +30 °C) and voltage range of (0.3376–2.736 V). The analysis of impedance data using the proposed mathematical model showed good agreement between the experimental and theoretical data. The dynamic behavior of the ultracapacitor was successfully represented by utilizing the proposed infinite r–C chains equivalent circuit, and the reverse Fourier transform analysis. The r–C electrical equivalent circuit was also analyzed using the PSIM simulation software to study the dynamic behavior of ultracapacitor parameters. The simulation study yields an excellent agreement between the experimental and calculated voltage characteristics for repetitive charging-discharging processes.

Sign in / Sign up

Export Citation Format

Share Document