scholarly journals Cyclic Voltammetry and Galvanostatic Charge-Discharge Analyses of Polyaniline/Graphene Oxide Nanocomposite based Supercapacitor

2020 ◽  
Vol 3 (1) ◽  
pp. 14-26
Author(s):  
MOHD ASYADI 'AZAM MOHD ABID ◽  
Mohd Izham Radzi ◽  
Muazzin Mupit ◽  
Hisyamuddin Osman ◽  
Rose Farahiyan Munawar ◽  
...  
2014 ◽  
Vol 936 ◽  
pp. 607-612
Author(s):  
Ying Wen Duan ◽  
Xun Sun ◽  
Hong Yu Zhao ◽  
Zhi Bo Liu

Graphene oxide-MnO2 (GO-MnO2) was successfully synthesized by microwave-assisted method with the substrate of GO covered by MnO2. MnO2 contained disordered pore structure and aggregate of random shape. GO exhibited layer-like shape and had a large numbers of functional groups on its surface. The electrochemical measurements were employed by cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD), the results showed that the GO-MnO2 composite had good capacitive performance, the maximum of specific capacitance was 127 F g-1 at the current density of 100 mA g-1.


2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Nur Hawa Nabilah Azman ◽  
Hong Ngee Lim ◽  
Yusran Sulaiman

Poly(3,4-ethylenedioxythiophene)/graphene oxide (PEDOT/GO) composites with wrinkled paper-like sheets morphology were electropolymerized potentiostatically at 1.2 V with different electrodeposition times (1–30 min) and various concentrations of GO (0.5, 1.0, 1.5, and 2.0 mg/mL). The electrochemical properties of PEDOT/GO composites as an electrode material for supercapacitor were investigated using cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD). The CV results revealed that PEDOT/GO containing 1.0 mg/mL GO and electropolymerized for 10 minutes exhibited the highest specific capacitance (157.17 F/g). This optimum PEDOT/GO was found to have energy and power density of 18.24 W/kg and 496.64 Wh/kg, respectively, at 1.0 A/g current density. The resistance of charge transfer obtained for PEDOT/GO is very low (13.10 Ω) compared to PEDOT (638.98 Ω), proving that PEDOT/GO has a good supercapacitive performance due to the synergistic effect of the high conductivity of PEDOT and large surface area of GO.


2014 ◽  
Vol 989-994 ◽  
pp. 316-319 ◽  
Author(s):  
Jing Zhu ◽  
Yong Guang Liu ◽  
Qing Qing Tian ◽  
Ling Wang ◽  
Ji Lin Cao

Li0.95Na0.05Ti2(PO4)3/C nanocomposite was prepared by sol-gel method.The structure and morphology of the samples were characterized by XRD, SEM which showed the particles had typical NASICON structure and diameter range from 400~500nm. The electrochemical performance were tested by cyclic voltammetry and galvanostatic charge–discharge. Results show Li0.95Na0.05Ti2(PO4)3/C nanocomposite exhibitsmuch better electrochemical performance than bare Li0.95Na0.05Ti2(PO4)3.


2017 ◽  
Vol 727 ◽  
pp. 698-704 ◽  
Author(s):  
Xian Wei Wang ◽  
Xiao Er Wang ◽  
Hui Chao Zhang ◽  
Qian Qian Zhu ◽  
Dong Li Zheng ◽  
...  

The structural and electrochemical properties of lanthanum manganate (LaMnO3) powder prepared by the sol-gel method are researched in this article. The powder calcined at 600 °C showed amorphous, and the powder calcined at 700-800 °C showed the pure phase of the LaMnO3. The grains with the size of about 80-120 nm were agglomerating together. Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical properties in alkaline environment. The electrochemical properties calcined at 700 °C showed a specific capacitance of 73 F/g at the current density of 0.5 A/g. The raw materials for preparing the LaMnO3 powder are cheap, and the operation method is simple.


2010 ◽  
Vol 663-665 ◽  
pp. 568-571
Author(s):  
Ren Qing Wang ◽  
Qin Fang ◽  
Mei Gen Deng

Activated carbon was fabricated by using phenolic resin as carbon source, tween-80 as organic template, KOH as activator. The samples were analyzed by N2 adsorption, scanning electron microscopy (SEM). Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical performance of the samples. The results showed that specific surface area of the prepared sample was 1935.99 m2/g, pore size was mainly in the range of 1.0~4.0 nm and showed typical capacitance characteristics in cyclic voltammetry. At a current density of 15mA/cm2, a specific capacitance of 246.18F/g was achieved and the resistance was 1.11Ω. Supercapacitors based on the sample had low ESR and excellent power property.


2020 ◽  
Author(s):  
Shyryn Nurbolat ◽  
Zhanar Kalkozova ◽  
Khabibulla Abdullin

Composite electrodes for supercapacitors have been obtained, consisting of a matrix of highly dispersed carbon materials: microcrystalline graphite and multi-walled carbon nanotubes, also a filler of nanoparticles of nickel hydroxide. Β-Co (OH) 2 and β-Ni (OH) 2 nanopowders were obtained by chemical deposition from solution. To create the electrodes, a polyvinylidene fluoride polymer in the form of a powder was used as a bonding material. The main technological stages of the manufacture of electrodes were determined, the parameters of the obtained structures were measured by the method of cyclic voltammetry and galvanostatic charge-discharge. For the manufacture of carbon electrodes, the optimal ratios of highly dispersed carbon materials, a binder polymer and a solvent have been determined to create mechanically strong layers with high conductivity and capacity. The technique of creating capacitor structures and measuring the capacitance of the obtained electrochemical capacitors has been worked out. Capacitors made of highly dispersed carbon materials showed typical rectangular curves of cyclic voltammetry and a linear decay-rise of the galvanostatic charge-discharge dependences. Typical values of specific capacity ~ 50 F / g were obtained. Composite electrodes made of nickel hydroxide nanoparticles in a carbon matrix demonstrated an increase in capacitance to ~ 180 F / g. It is shown that composite electrodes are promising for creating capacitors with a high specific capacity.


2011 ◽  
Vol 239-242 ◽  
pp. 1372-1375 ◽  
Author(s):  
Ya Kun Zhang ◽  
Jian Ling Li ◽  
Fei Gao ◽  
Xin Dong Wang

A layer of MnO2 was loaded between the SnO2/Ti substrate and the layer of PANI via a potentiodynamic electrodeposition. Electrochemical tests such as cyclic voltammetry and galvanostatic charge/discharge were applied to investigate the performance of the electrodes. The morphologies of the electrodes were also observed to identify the effect of the MnO2 layer. The specific capacitance of PANI with MnO2 reached to 601.48 F g-1 at a current density of 0.1 mA cm-2, which is 1.69 times as that of PANI electrodes without MnO2 layer. This gratifying result may due to the synergistic effect between MnO2 layer and PANI.


2015 ◽  
Vol 719-720 ◽  
pp. 137-140
Author(s):  
Ren Li Yang ◽  
Jun Shuang Zhou ◽  
Li Hou ◽  
Yu Feng Zhao ◽  
Fa Ming Gao

BCN nanoparticles sandwiched between carbon nanosheets were synthesized with the P123 and borate ammonium under nitrogen atmosphere. The samples were characterized by SEM, TEM, and EELS. The SEM and TEM images show BCN nanoparticles are attached on the carbon nanosheets. Cyclic voltammetry (CV) and galvanostatic charge-discharge measurements are used to evaluate electrochemical properties of the composites. The samples show the specific capacitance of 102 F/g at current density of 200mA/g and good durability.


2021 ◽  
Vol 10 (4) ◽  
pp. 94-101
Author(s):  
Apriwandi Apriwandi ◽  
Erman Taer ◽  
Rakhmawati Farma

Abstrak. Teknologi penyimpan energi elektrokimia yang ramah lingkungan merupakan aspek yang penting dalam menunjang kinerja sistem konversi energi terbarukan. Studi ini menyiapkan elektroda superkapasitor berbahan asal karbon aktif berpori limbah daun pisang kepok. Sampel dipreparasi melalui impregnasi Natrium hidroksida pada konsentrasi 0,5 m/L dan dipirolisis satu tahap meliputi karbonisasi dan aktivasi fisika. Serbuk karbon yang dihasilkan dikonversi dalam bentuk pellet atau monolit dengan menggunakan hidraulik press tanpa adanya penambahan bahan perekat. Proses karbonisasi dilakukan dari suhu kamar hingga 600 °C pada lingkungan gas N2 sedangkan proses aktivasi fisika dilakukan dari suhu 600 °C hingga pada suhu tinggi dengan tiga jenis suhu yang berbeda meliputi 700 °C, 800 °C, dan 900 °C pada lingkungan gas CO2. Analisis densitas ditinjau sebagai evaluasi awal elektroda karbon berpori. Lebih lanjut, sifat elektrokimia superkapasitor dievaluasi melalui dua teknik yang berbeda meliputi teknik cyclic voltammetry (CV) dan galanostatic charge discharge (GCD) pada sistem dua elektroda dalam elektrolit 1 M H2SO4. Kapasitansi spesifik pada teknik CV adalah sebesar 142 F/g sedangkan dengan teknik GCD menghasilkan kapsitansi spesifik sebesar 154 F/g pada resistansi 42∙10-3Ω. Rapat daya dan rapat energi yang dihasilkan berturut-turut 20,45 Wh/kg dan 38,32 W/kg. Hasil ini mengkonfirmasi bahwa daun pisang berpotensi dijadikan sebagai karbon aktif berpori untuk material dasar elektroda superkapasitor.Abstract. Environmentally friendly electrochemical energy storage technology is an important aspect of supporting global energy fulfillment as a contribution to improving the performance of renewable energy conversion systems. Currently, supercapacitors are considered as a superior electrochemical energy storage technology compared to others. This study performed a supercapacitor with electrodes made from porous activated carbon based on biomass waste, especially banana leaf waste. The sample was prepared by sodium hydroxide impregnated at a concentration of 0.5 m/L dan one-step pyrolysis both carbonization dan physical activation. The carbon powder is converted into pellets or monoliths using a hydraulic press without the addition of any adhesive materials. The carbonization process is performed from room temperature to 600 °C in an N2 gas environment while the physical activation process is carried out from a temperature of 600 °C to a high temperature with three different types including 700 °C, 800 °C, dan 800 °C in CO2 gas atmosphere. Density analysis is reviewed as an initial evaluation of the porous carbon electrode. Furthermore, the electrochemical properties of the supercapacitor were evaluated through two different techniques including cyclic voltammetry (CV) dan galvanostatic charge-discharge (GCD) in a two-electrode system in 1 M H2SO4 electrolyte. The specific capacitance in the CV technique is 142 F/g while the GCD technique produces a specific capacitance of 154 F/g at resistance of 42∙10-3 Ω. The power density dan energy densities for the K-900 are 20.45 Wh/kg dan 38.32 W/kg, respectively. These results confirmed that banana leaves have the potential to be used as porous activated carbon for the supercapacitor electrode.


2017 ◽  
Vol 727 ◽  
pp. 775-780 ◽  
Author(s):  
Yun Long Zhou ◽  
Chen Hao Zhao ◽  
Zhi Biao Hu ◽  
Xue Yan Huang ◽  
Kai Yu Liu ◽  
...  

The Co-Ni mixed oxides/graphene composite has been prepared using the solution based oxidation route. The structures of bare Co-Ni mixed oxides and Co-Ni mixed oxides/graphene composite is clearly studied by X-ray diffraction. The electrochemical properties of Co-Ni mixed oxides/graphene composite are investigated by Cyclic Voltammetry (CV) and galvanostatic charge discharge test. The result shows that, the NiO phase has not been detected in the composite, and the graphene composite delivers a discharge capacity of 353.6 F/g at a current density of 0.32 A g-1.


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