PREPARATION AND CHARACTERIZATION OF GO/ZnO ELECTRODE FOR SUPERCAPACITORS

In this paper, zinc oxide (ZnO) nanoparticles were prepared by solvothermal method. A mixture of ZnO nanoparticles and GO, surfactants, binders are dispersed in aqueous solvent. This suspension was then used as the ink for the modified 3d printer to coat on the graphite substrate to form electrodes. The GO/ZnO film has a specific capacitance of 119.9 F/g at a scan rate of 5 mV/s of CV test. The specific discharge capacitance was 153.9 F/g and retained 94.5% after 3000 cycles of galvanostatic charge-discharge (GCD) measurement with a current density of 15 mA/cm2.

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Synthesis and Characterization of Nano Mn3O4 for Lithium-Ion Batteries

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.687-691.4331 ◽

2014 ◽

Vol 687-691 ◽

pp. 4331-4334

Author(s):

Han Ping Zhu ◽

Peng Ding ◽

Song Fang ◽

Hailin Liu

Keyword(s):

Discharge Capacity ◽

Current Density ◽

Solvothermal Method ◽

Lithium Ion ◽

Constant Current ◽

Initial Discharge Capacity ◽

Initial Discharge ◽

Structure Morphology ◽

Specific Discharge

nanoMn3O4was prepared by a simple solvothermal method. The structure, morphology and electrochemical properties of the products were investigated by XRD, SEM and constant current discharge-charge test. The results of XRD and SEM shows that nanoMn3O4is high-purity, and it’s diameter is about 30 nm. It could deliver an initial discharge capacity of 1324.4 mAh g-1at the current density of 25.5 mA g-1, and the specific discharge capacity is 586.9 mAh g-1after 30 cycles at the current density of 30.4 mA g-1.

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Preliminary Study on the Performance of a Redox Capacitor with the use of Ionic Liquid-based Gel Polymer Electrolyte and Polypyrrole Electrodes

10.21203/rs.3.rs-218412/v1 ◽

2021 ◽

Author(s):

KAPURALAGE WATHSALA PRASADINI ◽

Kumudu Sandhya Perera ◽

Kamal Pushpakumara Vidanapathirana

Keyword(s):

Ionic Liquid ◽

Polymer Electrolyte ◽

Specific Capacitance ◽

Electrochemical Impedance ◽

Gel Polymer Electrolyte ◽

Discharge Capacitance ◽

Specific Discharge ◽

Electrode Interface ◽

Preliminary Study

Abstract Redox capacitor, which is one type of supercapacitor, has been attracted tremendously as they show a satisfactory specific capacitance, good cycle ability, and good stability. The present study reveals a redox capacitor fabricated with an ionic liquid (IL) based gel polymer electrolyte (GPE). Electrodes of the redox capacitor were fabricated with the conducting polymer, polypyrrole (PPy). The composition of the GPE was polyvinylidenefluoride-co-hexafluoropropylene (PVdF-co-HFP) : 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (1E3MITF) : ZnTF. Characterization of redox capacitor was done by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge-discharge (GCD) tests. The relaxation time constant (τ0) of the redox capacitor is about 31.57 s implying somewhat fast redox reactions. Initial single electrode specific capacitance (CSC) was 150.16 Fg-1 and at the 500th cycle, it was 40.03 Fg-1. The decrease of the CSC may be due to the formation of the passivation layer at the GPE / electrode interface resulting in degradation upon cycling. The GCD test resulted 48.40 Fg-1 of initial single electrode specific discharge capacitance (Csd) value. Upon 1000 cycles, it was reached 22.25 Fg-1. The decrease of Csd may be due to the degradation of the electrode and the IL-based GPE upon prolonged cycling.

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Optical and Photodetection Properties of ZnO Nanoparticles Recovered from Zn Dross

Crystals ◽

10.3390/cryst11010006 ◽

2020 ◽

Vol 11 (1) ◽

pp. 6

Author(s):

Lina Jaya Diguna ◽

Aprilia Dyah Fitriani ◽

Beta Riana Liasari ◽

Gerald Ensang Timuda ◽

Wahyu Bambang Widayatno ◽

...

Keyword(s):

Zno Nanoparticles ◽

Zno Nanoparticle ◽

Dye Molecules ◽

Photoluminescence Spectra ◽

Zno Film ◽

Light Region ◽

Emission Lifetime ◽

Hydrometallurgical Method ◽

Nanoparticle Film

In this study, we report the synthesis of ZnO nanoparticles from Zn dross via hydrometallurgical method by using acetic acid as a leaching agent. D205 dye molecules were then adsorbed onto Zn dross originated ZnO nanoparticle film. The optical absorption confirms the photosensitization of the synthesized ZnO nanoparticles with dye. The photoluminescence spectra reveal the excitonic- and defect-related emission of ZnO nanoparticles. Compared to ZnO nanoparticles only, the longer emission lifetime of ZnO nanoparticles with adsorbed dye indicates the transfer of photoexcited electrons from dye to the ZnO nanoparticles. Furthermore, photodetection characterization of ZnO film show the enhanced current density with the presence of dye under simulated solar illumination, while that measured at dark is similar in both films with and without dye. This result confirms the potentiality of Zn dross to be recycled into valuable ZnO nanoparticles particularly for the applications in the visible light region, especially for sensing.

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Synthesis and characterization of ZnO nanoparticles using pumpkin seed extract (Cucurbita moschata) by the sol-gel method

10.1063/5.0051826 ◽

2021 ◽

Author(s):

Nanda Saridewi ◽

Heri T. Syaputro ◽

Isalmi Aziz ◽

Dasumiati Dasumiati ◽

Biaunik N. Kumila

Keyword(s):

Zno Nanoparticles ◽

Sol Gel ◽

Seed Extract ◽

Synthesis And Characterization ◽

Cucurbita Moschata ◽

Pumpkin Seed ◽

Gel Method ◽

Sol Gel Method

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Synthesis and characterization of Gd2Zr2O7 defect-fluorite oxide nanoparticles via a homogeneous precipitation-solvothermal method

RSC Advances ◽

10.1039/c7ra11019g ◽

2017 ◽

Vol 7 (87) ◽

pp. 54980-54985 ◽

Cited By ~ 9

Author(s):

Zhe Tang ◽

Zhangyi Huang ◽

Jianqi Qi ◽

Xiaofeng Guo ◽

Wei Han ◽

...

Keyword(s):

Solvothermal Method ◽

Synthesis And Characterization ◽

Oxide Nanoparticles ◽

Homogeneous Precipitation

Defect-fluorite structured Gd2Zr2O7 nanoparticles were successfully synthesized via a homogeneous precipitation-solvothermal method using urea as a precipitant.

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Preparation and Characterization of Vanadium-Doped ZnO Nanoparticles for Environmental Application

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2011.3230 ◽

2011 ◽

Vol 11 (1) ◽

pp. 681-685 ◽

Cited By ~ 3

Author(s):

Hankwon Chang ◽

Jonian Nikolov ◽

Sun-Kyung Kim ◽

Hee Dong Jang ◽

Seng Lim ◽

...

Keyword(s):

Zno Nanoparticles ◽

Environmental Application ◽

Doped Zno

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Solvothermal synthesis and characterization of well-dispersed cerium-doped Y2SiO5 phosphor particles

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.1515/ijmr-2021-8281 ◽

2021 ◽

Vol 112 (10) ◽

pp. 812-816

Author(s):

Xianxue Li

Keyword(s):

Solvothermal Method ◽

Luminescence Decay ◽

X Ray Diffraction ◽

X Ray ◽

Fluorescence Spectrophotometry ◽

Decay Properties ◽

Transmission Electron ◽

Water As Solvent ◽

Pure Phase

Abstract Well-dispersed cerium-doped Y2SiO5 (Ce:YSO) phosphor particles with spherical morphology and good luminescence intensity have been achieved by a solvothermal method with ethanol and water as solvent media. X-ray diffraction, Fourier transform infrared spectroscopy, fluorescence spectrophotometry and transmission electron microscopy were employed to characterize the as-synthesized Ce:YSO precursor and powders. The results showed that pure-phase Ce:YSO powders with a mean particle size of about 162 nm were accurately available at 310°C and above. The fluorescence ability and persistent luminescence decay properties of the Ce:YSO powders were also studied, and the excellent fluorescence properties could be attributed to the homogeneous Ce:YSO particles obtained through the solvothermal method.

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