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Auteur : Grafiati
Publié le 14 mars 2023

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1

Suresh, R., K. Tamilarasan et D. Senthil Vadivu. « Electrochemical Features of Symmetric and Asymmetric Supercapacitors Based on Nanostructured Mn-Cuo Electrodes ». Oriental Journal of Chemistry 34, no 6 (8 novembre 2018) : 3058–63. http://dx.doi.org/10.13005/ojc/340648.

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Progress in material science has unearthed a number of options that offer great advantages for nanostructured electrode materials which enable supercapacitors to operate efficiently. Present work involves fabrication of symmetric and asymmetric type supercapacitor devices utilizing Mn-CuO nanostructures and activated carbon (AC) as electrode materials and subsequent investigation on their supercapacitive performance in 2M KOH aqueous electrolyte. The asymmetric supercapacitor device (Mn-CuO // 2M KOH// AC) demonstrate a specific capacitance of 72 Fg-1 at a current density of 0.5 Ag-1. The cyclic stability test of this device performed at a current density of 10 Ag-1 reveals a capacitance retention of 71% of its initial value over 300 charge-discharge cycles. In addition, this device exhibits an energy density of 7.4 Whkg-1 and a power density of 127 Wkg-1.
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2

Fite, Misganu Chewaka, Po-Jen Wang et Toyoko Imae. « Symmetric and Asymmetric Supercapacitors of ITO Glass and Film Electrodes Consisting of Carbon Dot and Magnetite ». Batteries 9, no 3 (8 mars 2023) : 162. http://dx.doi.org/10.3390/batteries9030162.

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To enhance the energy density, hybrid supercapacitors were fabricated, and their electrochemical features were investigated using a two-electrode configuration. By assembling nitrogen-doped graphene/magnetite (NG/Fe3O4) on indium tin oxide-coated (ITO) glass as a cathode and NG/carbon dots(Cdots)/Fe3O4 on ITO glass as an anode, a much higher gravimetric specific capacitance of 252.2 F/g, at a current density of 0.5 A/g, was obtained from this asymmetric supercapacitor compared with that (212.0 F/g) of a symmetric supercapacitor (NG/Cdots/Fe3O4)//(NG/Cdots/Fe3O4). A gravimetric energy density of 90.1 Wh/kg was obtained for an asymmetric ITO glass device at a specific power density of 400.0 W/kg. On the other hand, when an asymmetric two-electrode cell was fabricated with a Cdots/polypyrrole (PPy)/Fe3O4/TEMPO-oxidized cellulose nanofiber (TOCNF)-film electrode and a Cdots/PPy/TOCNF-film electrode, the specific capacitance (107.1 F/g) at a current density of 0.8 A/g was lower than that (456.4 F/g) of a symmetric (Cdots/PPy/Fe3O4/TOCNF)//(Cdots/PPy/Fe3O4/TOCNF)-film cell. Subsequently, a gravimetric energy density of 40.6 Wh/kg was achieved for a symmetric-film device at a specific power density of 320 W/kg. These results suggest that our method offers an efficient approach to developing symmetric and asymmetric devices consisting of hybrid materials for meeting the ever-increasing demands on energy-storage devices.
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Stepanov, Vladimir, Vladimir Chernov, Yury Parshikov, Viktor Lebedev et Yevgeny Kharanzhevsky. « Radiation-induced separation and accumulation of electric charge in supercapacitors ». Nuclear Energy and Technology 4, no 3 (7 décembre 2018) : 163–66. http://dx.doi.org/10.3897/nucet.4.30780.

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In current sources with a radioactive isotope (CSRI), nuclear energy is directly converted into electricity due to the separation of electric charges during the decay of radioactive isotopes. It was previously shown that asymmetric supercapacitors can be used as CSRI prototypes if, after being exposed to pulsed reactor irradiation, the electric charge on their plates increases to several coulombs as a result of internal induced activity. In this paper, the electric charge separation and accumulation in supercapacitors were studied directly in the process of neutron irradiation. The study was focused on the electrophysical characteristics of cylindrical supercapacitors with an organic electrolyte produced by JSC “ELEKOND”. A comparison of symmetric and asymmetric supercapacitors showed that an effective charge accumulation occurs in the asymmetric capacitors: it is independent of the neutron flux density and determined by the absorbed radiation dose. The electrical voltage between the plates of a symmetrical supercapacitor with a capacity of 100 F during irradiation up to an absorbed dose of 50 Gy reaches 1.24 mV. When asymmetric supercapacitors are irradiated with the same dose, a significant increase in the potential difference up to 1.15 V is observed during irradiation and for a long time afterwards (1.5·105 s) due to the electric charge redistribution (~ 5·10–3 C) in the electrolyte and carbon particles with the formation of a double electrical layer. The post-radiation increase in the capacity of asymmetric supercapacitors is ~ 5 mF.
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4

Huang, Guang Xu, Bao Lin Xing, Chuan Xiang Zhang et Lun Jian Chen. « Electrochemical Properties of Asymmetric Supercapacitors in Potassium Hydroxide Electrolyte ». Advanced Materials Research 459 (janvier 2012) : 488–91. http://dx.doi.org/10.4028/www.scientific.net/amr.459.488.

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Three kinds of activated carbons were prepared from Taixi anthracite by NaOH activation. As-obtained activated carbons were adopted as electrode materials to construct asymmetric and symmetric supercapacitors. The electrochemical properties of as-constructed supercapacitors in aqueous electrolyte (3.0M KOH) were investigated. Results show that the asymmetric supercapacitor assembled with activated carbon of a higher specific surface area (SBET) as the positive electrode exhibits better ion diffusion behavior and higher cell gravimetric specific capacitance (Cg). This is different from the case in non-aqueous system, mainly because pseudo-capacitance rather than double-layer capacitance has a more important effect on Cg in the aqueous electrolyte. Namely, the wettability and pseudo-capacitance of activated carbons decrease with increasing mass ratio of NaOH to anthracite, which is more prominent for activated carbons used as negative electrode materials.
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5

Gocki, Michał, Agnieszka Jakubowska-Ciszek et Piotr Pruski. « Comparative Analysis of a New Class of Symmetric and Asymmetric Supercapacitors Constructed on the Basis of ITO Collectors ». Energies 16, no 1 (27 décembre 2022) : 306. http://dx.doi.org/10.3390/en16010306.

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The paper presents the results of research on new electroconductive polymer materials, based on polypyrrole, for the different supercapacitor constructions, i.e., the symmetric and asymmetric constructions. All the supercapacitors considered contain ITO collectors. Measurements of the complex impedance frequency characteristics were performed for these elements using the electrochemical impedance spectroscopy (EIS) method. Selected fractional-order models, known from the literature, have been used to model the impedance of these elements. The Particle Swarm Optimization (PSO) algorithm was used to estimate the model parameters. Selected estimation results, their comparison, and conclusions are also presented in the paper. The type of active electrolyte component has the greatest impact on the shape of the impedance frequency characteristics. In most cases, the highest capacitance values and the smallest resistance values were obtained for asymmetric supercapacitors.
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6

Xia, Qi Xun, Nanasaheb M. Shinde, Tengfei Zhang, Je Moon Yun, Aiguo Zhou, Rajaram S. Mane, Sanjay Mathur et Kwang Ho Kim. « Seawater electrolyte-mediated high volumetric MXene-based electrochemical symmetric supercapacitors ». Dalton Transactions 47, no 26 (2018) : 8676–82. http://dx.doi.org/10.1039/c8dt01375f.

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A natural seawater electrolyte-mediated MXene//MXene asymmetric supercapacitor demonstrates a 27.4 F cm−3 volumetric specific capacitance at 0.25 A g−1, and 96.6% capacitance retention after 5000 cycles.
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7

Zou, Zhanghua, Yu Lei, Yingming Li, Yanhua Zhang et Wei Xiao. « Nitrogen-Doped Hierarchical Meso/Microporous Carbon from Bamboo Fungus for Symmetric Supercapacitor Applications ». Molecules 24, no 20 (12 octobre 2019) : 3677. http://dx.doi.org/10.3390/molecules24203677.

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We report the synthesis of nitrogen-doped hierarchical meso/microporous carbon using renewable biomass bamboo fungus as precursor via two-step pyrolysis processes. It is found that the developed porous carbon (NHPC-800) features honeycomb-like cellular framework with well-developed porosity, huge specific surface area (1708 m2 g−1), appropriate nitrogen-doping level (3.2 at.%) and high mesopore percentage (25.5%), which are responsible for its remarkable supercapacitive performances. Electrochemical tests suggest that the NHPC-800 electrode offers the largest specific capacitance of 228 F g−1, asplendid rate capability and stable electrochemical behaviors in a traditional three-electrode system. Additionally, asymmetric supercapacitor device is built based on this product as well. An individual as-assembled supercapacitor of NHPC-800//NHPC-800 delivers the maximum energy density of 4.3 Wh kg−1; retains the majority of capacitanceat large current densities; and shows terrific cycling durability with negligible capacitance drop after long-term charge/discharge for beyond 10,000 cycles even at a high current density of 10 A g−1. These excellent supercapacitive properties of NHPC-800 in both three- and two-electrode setups outperform those of lots of biomass-derived porous carbons and thus make it a perspective candidate for producing cost-effective and high-performance supercapacitors
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8

Khalid, Mohd, Milton A. Tumelero et Andre A. Pasa. « Asymmetric and symmetric solid-state supercapacitors based on 3D interconnected polyaniline–carbon nanotube framework ». RSC Advances 5, no 76 (2015) : 62033–39. http://dx.doi.org/10.1039/c5ra11256g.

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De, Shrabani, Chandan Kumar Maity, Sumanta Sahoo et Ganesh Chandra Nayak. « Polyindole Booster for Ti3C2Tx MXene Based Symmetric and Asymmetric Supercapacitor Devices ». ACS Applied Energy Materials 4, no 4 (24 mars 2021) : 3712–23. http://dx.doi.org/10.1021/acsaem.1c00142.

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10

Du, Weimin, Ruiqin Kang, Pengbiao Geng, Xin Xiong, Dan Li, Qingqing Tian et Huan Pang. « New asymmetric and symmetric supercapacitor cells based on nickel phosphide nanoparticles ». Materials Chemistry and Physics 165 (septembre 2015) : 207–14. http://dx.doi.org/10.1016/j.matchemphys.2015.09.020.

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11

Ghosh, Meena, Vidyanand Vijayakumar, Roby Soni et Sreekumar Kurungot. « A rationally designed self-standing V2O5 electrode for high voltage non-aqueous all-solid-state symmetric (2.0 V) and asymmetric (2.8 V) supercapacitors ». Nanoscale 10, no 18 (2018) : 8741–51. http://dx.doi.org/10.1039/c8nr00805a.

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12

Jesuraj, Dominic, David Thanasamy, Muralidharan Gopalan, Johnson William Joseph et Satheesh Kumar Konda Kannan. « Optimization of LiCl concentration on polyaniline composites for symmetric and asymmetric supercapacitor devices ». Materials Chemistry and Physics 285 (juin 2022) : 126109. http://dx.doi.org/10.1016/j.matchemphys.2022.126109.

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13

Nandhini, S., et G. Muralidharan. « The binder-free mesoporous CoNi2S4 electrode for high-performance symmetric and asymmetric supercapacitor devices ». Journal of Materials Science 57, no 10 (mars 2022) : 5933–53. http://dx.doi.org/10.1007/s10853-022-06987-2.

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14

Liu, Guijing, Yanying Shi, Lei Wang, Yadong Song, Shanmin Gao, Dong Liu et Leqing Fan. « Reduced graphene oxide/polypyrrole composite : an advanced electrode for high-performance symmetric/asymmetric supercapacitor ». Carbon Letters 30, no 4 (30 octobre 2019) : 389–97. http://dx.doi.org/10.1007/s42823-019-00108-x.

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15

Cao, Yi, Baoping Lin, Ying Sun, Hong Yang et Xueqin Zhang. « Symmetric/Asymmetric Supercapacitor Based on the Perovskite-type Lanthanum Cobaltate Nanofibers with Sr-substitution. » Electrochimica Acta 178 (octobre 2015) : 398–406. http://dx.doi.org/10.1016/j.electacta.2015.08.033.

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16

Jing, Xuyang, Cong Wang, Wenjing Feng, Na Xing, Hanmei Jiang, Xiangyu Lu, Yifu Zhang et Changgong Meng. « Hierarchical VOOH hollow spheres for symmetrical and asymmetrical supercapacitor devices ». Royal Society Open Science 5, no 1 (janvier 2018) : 171768. http://dx.doi.org/10.1098/rsos.171768.

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Hierarchical VOOH hollow spheres with low crystallinity composed of nanoparticles were prepared by a facile and template-free method, which involved a precipitation of precursor microspheres in aqueous solution at room temperature and subsequent hydrothermal reaction. Quasi-solid-state symmetric and asymmetric supercapacitor (SSC and ASC) devices were fabricated using hierarchical VOOH hollow spheres as the electrodes, and the electrochemical properties of the VOOH//VOOH SSC device and the VOOH//AC ASC device were studied by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS). Results demonstrated that the electrochemical performance of the VOOH//AC ASC device was better than that of the VOOH//VOOH SSC device. After 3000 cycles, the specific capacitance of the VOOH//AC ASC device retains 83% of the initial capacitance, while the VOOH//VOOH SSC device retains only 7.7%. Findings in this work proved that hierarchical VOOH hollow spheres could be a promising candidate as an ideal electrode material for supercapacitor devices.
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17

Sahu, Vikrant, Ram Bhagat Marichi, Gurmeet Singh et Raj Kishore Sharma. « Hierarchical Polyaniline Spikes over Vegetable Oil derived Carbon Aerogel for Solid-State Symmetric/Asymmetric Supercapacitor ». Electrochimica Acta 240 (juin 2017) : 146–54. http://dx.doi.org/10.1016/j.electacta.2017.04.058.

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18

Villanueva, Joel L., Gabriel Angelo Tapas, Jezza B. Bayot, Menandro C. Marquez et Ruth R. Aquino. « Electrospun Polyacrylonitrile-Keratin Derived Carbon Nanofiber as Electrode for Asymmetric Supercapacitor ». Key Engineering Materials 878 (mars 2021) : 56–61. http://dx.doi.org/10.4028/www.scientific.net/kem.878.56.

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Electrospinning is one method to produce nanosized materials in a form of fibers with a large variety of polymeric solutions. In this research, Polyacrylonitrile (PAN) dissolved in N,N-Dimethylformamide (DMF) as the primary solvent, loaded with keratin protein solution, was blended using the said fabrication method to change its properties. The loading of the keratin solution concentrates varied from 5%, 7%, and 10% relative to the volume of the solution. The PAN-keratinnano substances were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Cyclic Voltammetry (CV), and Galvanostatic Cycling with Potential Limitation (GCPL) to illustrate the properties of the fiber. The SEM micrographs showed that upon adding keratin into the PAN the diameter lengths of the imaged fibers were still nanofiber. As the viscosity of the solution is increased, the beads become bigger, the average distance between beads and the fiber diameter increases, and the shape of the beadings changes from spherical to spindle-like. In addition, CV and GCPL revealed that as the potential scan rate is being increased, the surrounded area of the CV also increases. The presence of redox peaks implies that a faradaic process occurs. The migration and diffusion of ions can be supported by the carbonized fibers. GCPL shows the triangular shape with symmetric charging and discharging slopes at a current density of 0.5mah, 1mah, 1.5mah and 2.5mah, confirming that the electrodes behave as a pure electric double layer capacitor (EDLC).
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19

Wei, Chengzhen, Cheng Cheng, Lan Ma, Mengna Liu, Dechen Kong, Weimin Du et Huan Pang. « Mesoporous hybrid NiOx–MnOx nanoprisms for flexible solid-state asymmetric supercapacitors ». Dalton Transactions 45, no 26 (2016) : 10789–97. http://dx.doi.org/10.1039/c6dt01025c.

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Kosenko, Roman, Andrei Blinov, Dmitri Vinnikov et Andrii Chub. « Asymmetric snubberless current-fed full-bridge isolated DC-DC converters ». Electrical, Control and Communication Engineering 14, no 1 (1 juillet 2018) : 5–11. http://dx.doi.org/10.2478/ecce-2018-0001.

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Abstract This paper presents two isolated current-fed fullbridge DC-DC converters that can be used to interface a lower voltage source into a DC bus of higher voltage. The first topology uses a resonant circuit to force current redistribution between low-voltage-side transistors and a passive rectifier. The second topology utilizes an active rectifier with secondary modulation to achieve the same goal. The resonant circuit can be formed by using transformer leakage inductance and the parasitic capacitances of the switches. The converters feature soft switching of semiconductors over a wide range of operating conditions. This is achieved with decreased energy circulation when compared to existing topologies with symmetric control and with fewer semiconductors than in those with phase-shift control. The topologies can be implemented in renewable, supercapacitor, battery, fuel cell, and DC microgrid applications. Steady-state operation and design aspects of the converters are presented and verified experimentally with 400 W prototypes
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21

Dirican, Mahmut, Meltem Yanilmaz et Xiangwu Zhang. « Free-standing polyaniline–porous carbon nanofiber electrodes for symmetric and asymmetric supercapacitors ». RSC Adv. 4, no 103 (2014) : 59427–35. http://dx.doi.org/10.1039/c4ra09103e.

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22

Zhang, Dan, Chao Tan, Weizhuo Zhang, Weijie Pan, Qi Wang et Le Li. « Expanded Graphite-Based Materials for Supercapacitors : A Review ». Molecules 27, no 3 (21 janvier 2022) : 716. http://dx.doi.org/10.3390/molecules27030716.

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Supercapacitors have gained e wide attention because of high power density, fast charging and discharging, as well as good cycle performance. Recently, expanded graphite (EG) has been widely investigated as an effective electrode material for supercapacitors owing to its excellent physical, chemical, electrical, and mechanical properties. Based on charge storage mechanism, supercapacitors have been divided into symmetric, asymmetric, and hybrid supercapacitors. Here, we review the study progress of EG-based materials to be electrode materials. Furthermore, we discuss the application prospects and challenges of EG-based materials in supercapacitors.
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23

Hekmat, Farzaneh, Husnu Emrah Unalan et Saeed Shahrokhian. « Biomass-derived wearable energy storage systems based on poplar tree-cotton fibers coupled with binary nickel–cobalt nanostructures ». Sustainable Energy & ; Fuels 4, no 2 (2020) : 643–54. http://dx.doi.org/10.1039/c9se00565j.

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We demonstrated symmetric and asymmetric supercapacitors (SSCs and ASCs) based on core/shell-like Ni–Co oxide@cotton//Fe2O3–carbon nanotubes@cotton that are capable of storing a remarkable amount of energy, while retaining a high power density and long cycle life.
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Cherusseri, Jayesh, Kowsik Sambath Kumar, Nitin Choudhary, Narasimha Nagaiah, Yeonwoong Jung, Tania Roy et Jayan Thomas. « Novel mesoporous electrode materials for symmetric, asymmetric and hybrid supercapacitors ». Nanotechnology 30, no 20 (11 mars 2019) : 202001. http://dx.doi.org/10.1088/1361-6528/ab0685.

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25

Lonkar, Sunil, Chiara Busa et Mohamed AlTeneiji. « Scalable Preparation of Nanostructured Hybrids of Transition Metal Sulfide/Oxide With Carbon Materials for High-Performance Supercapacitors ». ECS Meeting Abstracts MA2022-02, no 1 (9 octobre 2022) : 61. http://dx.doi.org/10.1149/ma2022-02161mtgabs.

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The ever-growing demands and rapid development of energy storage devices and systems pressed the need for low-cost yet highly performing electrode materials. The transition metal oxide and sulfide-based hybrids holds great promise as the active electrode materials in supercapacitors, due to their large surface area and variable oxidation states. These properties enable significantly high energy storage via electrical double layer and pseudocapacitive charge storage mechanisms. Herein, we discuss a facile, scalable, and environment-friendly preparation process to produce transition metal sulfide and oxides based on resource rich metals such as Mn, Fe, V etc. and their hybrids with carbonaceous materials, such as carbon nanotubes and graphene. This strategy encompasses solvent-less mixing of a metal salt, surfeit yet non-toxic abundant elemental sulfur and carbon precursor under continuous ball milling and thermo-annealing. The resulting nanohybrids were thoroughly investigated by means of several techniques. XRD, HRTEM, SEM, Raman and BET could gather insights on the morphology and the fine material structure, as well as on the spectroscopic properties. Finally, the electrochemical properties as supercapacitor components were investigated in regards with varyingly increasing carbon content. The nanohybrids were tested in both aqueous and organic electrolytes for bettering energy and power performances. Charge storage performances and components stability in both symmetric and asymmetric devices were assessed via CV, GCD, EIS.
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Ostafiychuk, B. K., M. I. Kolkovskyi, B. I. Rachiy, P. I. Kolkovskyi, N. Ya Ivanichok et R. V. Ilnitsky. « Accumulation charge mechanisms in electrochemical systems formed based on activated carbon and manganese oxide ». Фізика і хімія твердого тіла 21, no 1 (29 mars 2020) : 27–34. http://dx.doi.org/10.15330/pcss.21.1.19-34.

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In this work, the porous structure of the carbon material and the crystalline structure of manganese oxide α - modification (α - MnO2) have been investigated. The electrochemical performance of symmetric and asymmetric supercapacitors (α - MnO2 / Activated carbon) was investigated by cyclic voltammetry and galvanostatic cycling methods. The processes occur mainly at the electrode – electrolyte interface have been analyzed. It was determined that at discharge currents of 0.5 - 5 mA, the specific capacitance value for the α - MnO2 / Activated carbon hybrid capacitor exceeds the value of the symmetric capacitor by 45 - 55 % under the same conditions.
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Buldu-Akturk, Merve, Özge Balcı-Çağıran et Emre Erdem. « EPR investigation of point defects in HfB2 and their roles in supercapacitor device performances ». Applied Physics Letters 120, no 15 (11 avril 2022) : 153901. http://dx.doi.org/10.1063/5.0089931.

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Boron-based materials have various attractive properties and gained increased attention in recent years as promising materials for energy storage applications. Despite vast literature on structural and mechanical properties of transition metal diborides, hafnium diboride (HfB2) in particular, research that addresses the use of HfB2 as an electrode for supercapacitor devices is lacking. Herein, we report both the synthesis and characterization of HfB2 and its electrochemical performance as the electrode for all-in-one symmetric and asymmetric supercapacitor devices. HfB2 powders were synthesized by mechanical activation assisted carbothermal reduction of hafnium oxide and boron oxide precursors. To improve the electrochemical energy storage performance of the electrodes, point defects (either Hf or B vacancies/interstitials) were formed in HfB2 through annealing at different temperatures (1450 and 1650 °C) under a flowing Ar atmosphere. The origin of point defects and their localization on the surface in HfB2 were identified using electron paramagnetic resonance (EPR) spectroscopy and discussed both from chemical and materials point-of-view. The defective HfB2 electrode exhibited higher performance than that of the non-defective one with specific energy and power densities of 0.144 W h kg−1 and 33.3 W kg−1; specific charge–discharge capacities of 0.32 and 0.31 mA h g−1; and 115.5%, 106.2%, and 84.1% retention of the initial capacitances, respectively. The relation between the defect content and the improved supercapacitor performances was explained by employing several structural (x-ray diffractometer and x-ray fluorescence), electronic (EPR), and electrochemical (potentiostatic electrochemical impedance spectroscopy, cyclic voltammetry, galvanostatic cycling with potential limitation) characterization tools.
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Ahuja, Preety, Sanjeev Kumar Ujjain et Rajni Kanojia. « Electrochemical behaviour of manganese & ; ruthenium mixed oxide@ reduced graphene oxide nanoribbon composite in symmetric and asymmetric supercapacitor ». Applied Surface Science 427 (janvier 2018) : 102–11. http://dx.doi.org/10.1016/j.apsusc.2017.08.028.

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29

Barpanda, Prabeer, Giovanni Fanchini et Glenn G. G. Amatucci. « Nanostructured Halide Modified Carbon Electrodes for Symmetric and Asymmetric Electrochemical Supercapacitors ». ECS Transactions 6, no 25 (19 décembre 2019) : 177–82. http://dx.doi.org/10.1149/1.2943236.

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Keskinen, Jari, Saara Tuurala, Martin Sjödin, Kaisa Kiri, Leif Nyholm, Timo Flyktman, Maria Strømme et Maria Smolander. « Asymmetric and symmetric supercapacitors based on polypyrrole and activated carbon electrodes ». Synthetic Metals 203 (mai 2015) : 192–99. http://dx.doi.org/10.1016/j.synthmet.2015.02.034.

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31

Huang, Gui-Wen, Na Li, Yi Du, Qing-Ping Feng, Hong-Mei Xiao, Xing-Hua Wu et Shao-Yun Fu. « Laser-Printed In-Plane Micro-Supercapacitors : From Symmetric to Asymmetric Structure ». ACS Applied Materials & ; Interfaces 10, no 1 (26 décembre 2017) : 723–32. http://dx.doi.org/10.1021/acsami.7b15922.

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32

Cherusseri, Jayesh, Deepak Pandey et Jayan Thomas. « Symmetric, Asymmetric, and Battery‐Type Supercapacitors Using Two‐Dimensional Nanomaterials and Composites ». Batteries & ; Supercaps 3, no 9 (4 juin 2020) : 860–75. http://dx.doi.org/10.1002/batt.201900230.

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Guo, Lei, Lien Zhu, Lei Ma, Jian Zhang, QiuYu Meng, Zheng Jin, Meihua Liu et Kai Zhao. « Bead chain structure RFC/ACF by electrospinning for supercapacitors ». Pigment & ; Resin Technology 48, no 5 (2 septembre 2019) : 439–48. http://dx.doi.org/10.1108/prt-08-2018-0074.

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Purpose The purpose of this paper is to prepare a spherical modifier-modified activated carbon fiber of high specific capacitance intended for electrode materials of supercapacitor. Design/methodology/approach In this study, phenolic-based microspheres are taken as modifiers to prepare PAN-based fiber composites by electrospinning, pre-oxidation and carbonization. Pearl-chain structures appear in RFC/ACF composites, and pure polyacrylonitrile fibers show a dense network. The shape and cross-linking degree are large. After the addition of the phenolic-based microspheres, the composite material exhibits a layered pearlite chain structure with a large porosity, and the RFC/ACF composite material is derived because of the existence of a large number of bead chain structures in the composite material. The density increases, the volume declines and the mass after being assembled into a supercapacitor as a positive electrode material decreases. The specific surface area of RFC/ACF composites is increased as compared to pure fibers. The increase in specific surface area could facilitate the diffusion of electrolyte ions in the material. Owing to the large number of bead chains, plenty of pore channels are provided for the diffusion of electrolyte ions, which is conducive to enhancing the electrochemical performance of the composite and improving the RFC/ACF composite and the specific capacitance of the material. The methods of electrochemical testing on symmetric supercapacitors (as positive electrodes) are three-electrode cyclic voltammetry, alternating current impedance and cycle stability. Findings The specific capacitance value of the composite material was found to be 389.2 F/g, and the specific capacitance of the electrode operating at a higher current density of 20 mA/cm2 was 11.87 F/g (the amount of the microsphere modifier added was 0.3 g). Using this material as a positive electrode to assemble into asymmetrical supercapacitor, after 2,000 cycles, the specific capacitance retention rate was 87.46 per cent, indicating excellent cycle stability performance. This result can be attributed to the fact that the modifier embedded in the fiber changes the porosity between the fibers, while improving the utilization of the carbon fibers and making it easier for electrolyte ions to enter the interior of the composites, thereby increasing the capacitance of the composites. Originality/value The modified PAN-based activated carbon fibers in the study had high specific surface area and significantly high specific capacitance, which makes it applicable as an efficient and environment-friendly absorbent, as well as an advanced electrode material for supercapacitor.
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Wu, Zhong-Shuai, Xinliang Feng et Hui-Ming Cheng. « Recent advances in graphene-based planar micro-supercapacitors for on-chip energy storage ». National Science Review 1, no 2 (6 décembre 2013) : 277–92. http://dx.doi.org/10.1093/nsr/nwt003.

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Abstract The current development trend towards miniaturized portable electronic devices has significantly increased the demand for ultrathin, flexible and sustainable on-chip micro-supercapacitors that have enormous potential to complement, or even to replace, micro-batteries and electrolytic capacitors. In this regard, graphene-based micro-supercapacitors with a planar geometry are promising micro-electrochemical energy-storage devices that can take full advantage of planar configuration and unique features of graphene. This review summarizes the latest advances in on-chip graphene-based planar interdigital micro-supercapacitors, from the history of their development, representative graphene-based materials (graphene sheets, graphene quantum dots and graphene hybrids) for their manufacture, typical microfabrication strategies (photolithography techniques, electrochemical methods, laser writing, etc.), electrolyte (aqueous, organic, ionic and gel), to device configuration (symmetric and asymmetric). Finally, the perspectives and possible development directions of future graphene-based micro-supercapacitors are briefly discussed.
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Arya, Anil, Muzahir Iqbal, Shweta Tanwar, Annu Sharma, A. L. Sharma et Vijay Kumar. « Mesoporous carbon/titanium dioxide composite as an electrode for symmetric/asymmetric solid‐state supercapacitors ». Materials Science and Engineering : B 285 (novembre 2022) : 115972. http://dx.doi.org/10.1016/j.mseb.2022.115972.

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Guo, Manying, Zihan Qu, Juan Zhou, Chengdong Han, Xu Liu, Hongbin Liu et Lijun Zhao. « Dramatically comprehensive improved electrochemical performances of symmetric and asymmetric supercapacitors under external magnetic field ». Chemical Communications 57, no 73 (2021) : 9216–19. http://dx.doi.org/10.1039/d1cc03289e.

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Wang, Wei, Baoping Lin, Yi Cao, Ying Sun, Xueqin Zhang, Hong Yang et Hao Sun. « High-performance GdxSr1-xNiO3 porous nanofibers prepared by electrospinning for symmetric and asymmetric supercapacitors ». Journal of Physics and Chemistry of Solids 140 (mai 2020) : 109361. http://dx.doi.org/10.1016/j.jpcs.2020.109361.

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Bavio, M. A., G. G. Acosta, T. Kessler et A. Visintin. « Flexible symmetric and asymmetric supercapacitors based in nanocomposites of carbon cloth/polyaniline - carbon nanotubes ». Energy 130 (juillet 2017) : 22–28. http://dx.doi.org/10.1016/j.energy.2017.04.135.

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Zheng, Jiahong, Kangkang Cheng, Runmei Zhang, Yamei Yang, Yuntao Wu et Pengfei Yu. « Si Quantum Dots Assist Synthesized Microflower-Like Si/MoS2 Composites for Supercapacitors ». Crystals 10, no 9 (22 septembre 2020) : 846. http://dx.doi.org/10.3390/cryst10090846.

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The microflower-like Si/MoS2 composites were fabricated using Si quantum dots (QDs) to assist a facile hydrothermal method. The electrochemical performance of Si/MoS2 composite in symmetric and asymmetric systems was studied. Electrochemical characterization revealed that the Si/MoS2 composite electrode in a three-electrode system has a high specific capacitance of 574.4 F·g−1 at 5 A·g−1. Furthermore, the Si/MoS2 composite electrode in a two-electrode system had the maximum energy density of 27.2 Wh·kg−1 when a power density of 749.1 W·kg−1 was achieved. Therefore, this investigation proves the Si/MoS2 composite microflower-like structure should be a promising candidate electrode material for supercapacitors.
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Ganesh, V., S. Pitchumani et V. Lakshminarayanan. « New symmetric and asymmetric supercapacitors based on high surface area porous nickel and activated carbon ». Journal of Power Sources 158, no 2 (août 2006) : 1523–32. http://dx.doi.org/10.1016/j.jpowsour.2005.10.090.

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Bavio, Marcela A., Gerardo G. Acosta et Teresita Kessler. « Energy storage in symmetric and asymmetric supercapacitors based in carbon cloth/polyaniline-carbon black nanocomposites ». International Journal of Energy Research 39, no 15 (23 octobre 2015) : 2053–61. http://dx.doi.org/10.1002/er.3441.

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Das, Himadri Tanaya, Selvaraj Saravanya et Perumal Elumalai. « Disposed Dry Cells as Sustainable Source for Generation of Few Layers of Graphene and Manganese Oxide for Solid‐State Symmetric and Asymmetric Supercapacitor Applications ». ChemistrySelect 3, no 46 (11 décembre 2018) : 13275–83. http://dx.doi.org/10.1002/slct.201803034.

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Lonkar, Sunil, Chiara Busa et Mohamed AlTeneiji. « 2D Materials Integrated CNT Hybrid Paper Electrodes for Flexible All-Solid-State Supercapacitors ». ECS Meeting Abstracts MA2022-01, no 1 (7 juillet 2022) : 6. http://dx.doi.org/10.1149/ma2022-0116mtgabs.

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Flexible supercapacitors (SCs) have attracted growing interests as the power source for portable and wearable electronics. Carbon nanotubes (CNTs) are emerged as one of the promising materials for flexible SC electrodes due to their excellent high electrical conductivity, high mechanical strength, large surface area, and functionalization ability. CNTs can be assembled into several macroscopic forms based on the applications. In the present work, the CNT buckypapers integrated with 2D materials such as graphene and transition metal sulfides (TMDs) especially, tin sulfide (SnS2) nanoparticles were prepared using a simple mould casting method. The flexible and free-standing, interface-enhanced CNT paper having homogeneously dispersed 2D materials was prepared. The hybridized CNT papers were thoroughly characterized to elucidate their structural and surface properties. Finally, such hybrid CNT papers were used as binder-free, free-standing electrodes for the fabrication of flexible-all-solid-state supercapacitors. The electrochemical performance (CV, GCD, EIS) of the as obtained the symmetric and asymmetric devices were assessed to evaluate the charge storage performance and effect of 2D materials on the charge storage capability and stability were studied. Figure 1
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Rajesh, Murugesan, Ramu Manikandan, Seungil Park, Byung Chul Kim, Won‐Je Cho, Kook Hyun Yu et C. Justin Raj. « Pinecone biomass‐derived activated carbon : the potential electrode material for the development of symmetric and asymmetric supercapacitors ». International Journal of Energy Research 44, no 11 (21 mai 2020) : 8591–605. http://dx.doi.org/10.1002/er.5548.

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Makgopa, Katlego, et Mpho Sofnee Ratsoma. « Structural Elucidation of Nitrogen-Doped Reduced Graphene Oxide/Hausmannite Manganese Oxide Nanocomposite for Supercapacitor Applications ». ECS Meeting Abstracts MA2022-02, no 1 (9 octobre 2022) : 71. http://dx.doi.org/10.1149/ma2022-02171mtgabs.

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The increasing consumption of fossils fuel accompanied by related carbon emissions and complex set of issues associated with the generation and use of electricity has raised an urgent need for reliable, renewable and sustainable energy alternatives [1]. Nanotechnology and the production of nanostructured materials has driven the rapid growth in the research of carbon nanomaterials as energy storage materials for supercapacitor (SCs) applications. Among several carbon nanomaterials explored for SCs, graphene has shown to be the leading carbon nanomaterial, due to its intriguing properties such as highly tunable surface area, outstanding electrical conductivity, good chemical stability and excellent mechanical behavior [2]. Due to challenges in the bulk synthesis of graphene, reduced graphene oxide (rGO) has been opted as the preferred choice for the development of SC devices. Transition metal oxides also gained much interest in various research industries as materials for SCs applications. Among transition metal oxides, manganese oxide, MnxOy, appeared to be the promising electrode material due to its interesting properties such as cost effectiveness, high theoretical specific capacitance, high theoretical surface area (≥ 1370 m2 g-1), and excellent electrochemical reversibility. However, the poor conductivity of manganese oxide restricts its progress in SC applications [2, 3]. Therefore, great attention has been devoted to the improvement of the electronic properties of manganese oxides-based electrode materials by decorating them on highly conductive carbon-based nanomaterials. Although intensive study has been done on carbon nanomaterials integrated with MnxOy for pseudocapacitors, there is still less literature on the use of Mn3O4 nanoparticles decorated on carbon materials for application in SCs This work presents a hydrothermal synthesis of the nitrogen-doped reduced graphene oxide/hausmannite manganese oxide (N-rGO/Mn3O4) nanohybrid which showed a great electrochemical performance such as high specific capacitance of 345 F g-1 and a maximum of specific energy of 12.0 Wh kg-1 (current density: 0.1 A g−1), and a maximum specific power of 22.5 kW kg-1 (current density: 10.0 A g−1) in a symmetric configuration. The nanohybrid further showed excellent supercapacitor performance in an asymmetric configuration, with the maximum specific energy and power reaching 34.6 Wh kg−1 (0.1 A g−1) and 14.01 kW kg−1 (10.0 A g−1) respectively. The results obtained affirm the use of N-rGO/Mn3O4 as a potential electrode material for high energy and power supercapacitor devices that can be commercially competitive to that of rechargeable batteries. References [1] P. Simon, Y. Gogotsi, Materials for electrochemical capacitors., Nat. Mater. 7 (2008) 845 [2] K. Xie, B. Wei, Nanomaterials for stretchable energy storage and conversion devices, Nanosci. Technol. (2016) 159 [3] K. Makgopa, K. Raju, P.M. Ejikeme, K.I. Ozoemena, High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports, Carbon 117 (2017) 20
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Gan, Yong X. « Comments on “High-performance GdxSr1-xNiO3 porous nanofibers prepared by electrospinning for symmetric and asymmetric supercapacitors” J. Phys. Chem. Solid. » Journal of Physics and Chemistry of Solids 147 (décembre 2020) : 109675. http://dx.doi.org/10.1016/j.jpcs.2020.109675.

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Pandian, P. Muthu, et A. Pandurangan. « Enhanced electrostatic potential with high energy and power density of a symmetric and asymmetric solid-state supercapacitor of boron and nitrogen co-doped reduced graphene nanosheets for energy storage devices ». New Journal of Chemistry 45, no 28 (2021) : 12408–25. http://dx.doi.org/10.1039/d1nj00486g.

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Wang, Meimei, Kuihua Han, Jianhui Qi, Jinxiao Li, Zhaocai Teng et Jigang Zhang. « Heteroatom-Rich Porous Carbons Derived from Nontoxic Green Organic Crystals for High-Performance Symmetric and Asymmetric Supercapacitors with Aqueous/Gel Electrolyte ». ACS Sustainable Chemistry & ; Engineering 8, no 36 (6 août 2020) : 13634–47. http://dx.doi.org/10.1021/acssuschemeng.0c03267.

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Lissandrello, Federico, Eugenio Gibertini et Luca Magagnin. « Inkjet Printing of Prussian Blue Analogues for Flexible Asymmetric Microcapacitors ». ECS Meeting Abstracts MA2022-02, no 59 (9 octobre 2022) : 2203. http://dx.doi.org/10.1149/ma2022-02592203mtgabs.

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Flexible electronic devices based on smart fabrics are generating a vast amount of interest and increasing efforts are being devoted to their development. In the next future, smart textiles will integrate diverse functions such as energy harvesting, human health monitoring and more. As a consequence, the development of flexible energy storage as a mean to power wearable devices has become ever more urgent. Among the manufacturing techniques for flexible batteries and capacitors, inkjet printing has cemented itself as one of the most popular, mainly thanks to its versatility and simplicity. In this scenario, a great effort is being devoted towards research and development of innovative, more sustainable materials that satisfy the requirements for both printability and energy storage capabilities. [1] Prussian blue analogues (PBA) are a class of materials that have been studied extensively as cathodic materials for a wide variety of energy storage devices, such as Li-ion batteries, Na-ion batteries, Zn-ion batteries, and supercapacitors. [2] Their open framework structure allows reversible intercalation of hydrated cations, making them perfectly compatible with aqueous electrolytes. Thanks to this feature, along with their agile synthetic route, low cost and benign nature of their precursors, PBA are regarded as one of the most promising materials for future energy storage devices. [3] Despite their increasing popularity, inkjet printing of PBA for flexible energy storage devices has not been reported yet. In this work, inkjet printing of PBA is proposed as a viable technique to manufacture flexible asymmetric supercapacitors with a Ti3C2 MXene anode. MXenes are a new class of 2D materials which have gained a lot of interest due to their metallic conductivity and exceptional water processability. While their use in symmetric capacitors has already been demonstrated, these devices tend to operate in a small potential window (≈ 500 mV) as to prevent unwanted MXene oxidation, which limits their specific power. [4] By coupling the MXene anode with a PBA cathode, it is therefore possible to extend the potential window of the device and consequently the power that can be delivered. Prussian blue analogues powders are synthesized by the traditional co-precipitation route. Printable, water-based inks containing the PBA particles are then used to manufacture flexible electrodes on various substrates. Electrochemical characterization is carried out in custom, 3D printed, three electrodes cells, allowing for non-destructive testing of the printed electrodes. Finally, the electrochemical properties of the capacitors will be tested in aqueous electrolytes as well as with semi-solid electrolytes at rest and under mechanical deformation. Bibliography [1] K. H. Choi, D. B. Ahn, and S. Y. Lee, “Current Status and Challenges in Printed Batteries: Toward Form Factor-Free, Monolithic Integrated Power Sources,” ACS Energy Lett., vol. 3, no. 1, pp. 220–236, Jan. 2018. [2] G. Du and H. Pang, “Recent advancements in Prussian blue analogues: Preparation and application in batteries,” Energy Storage Mater., vol. 36, pp. 387–408, Apr. 2021. [3] B. Wang et al., “Prussian Blue Analogs for Rechargeable Batteries,” iScience, vol. 3, pp. 110–133, May 2018. [4] D. Wen et al., “Inkjet Printing Transparent and Conductive MXene (Ti3C2Tx) Films: A Strategy for Flexible Energy Storage Devices,” ACS Appl. Mater. Interfaces, vol. 13, no. 15, pp. 17766–17780, Apr. 2021.
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Reddy, N. Ramesh, P. Mohan Reddy, Tapas K. Mandal, Anil Kumar Yedluri et Sang Woo Joo. « Architecture of superior hybrid electrode by the composition of Cu2O nanoflakes, novel cadmium ferrite (CdFe2O4) nanoparticles, and g-C3N4 sheets for symmetric and asymmetric supercapacitors ». Journal of Energy Storage 43 (novembre 2021) : 103302. http://dx.doi.org/10.1016/j.est.2021.103302.

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