Ni-MnO2 Synthesized by One-Step Liquid Phase Coprecipitation as Promising Electrode Materials for Supercapacitor

2020 ◽  
Vol 999 ◽  
pp. 21-27 ◽  
Author(s):  
Yue Zhou ◽  
Qing Hao Yang ◽  
Jie Dong
Keyword(s):  
Cyclic Voltammetry ◽  
Liquid Phase ◽  
Electrochemical Properties ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Morphology ◽  
Persistence Rate ◽  
One Step

Nickel-doped manganese dioxide (Ni-MnO2) as electrode materials for supercapacitors were successfully prepared by one-step chemical liquid phase coprecipitation with the different nickel doped proportions. X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF) were used to analyze the micro-structure, morphology and composition. And electrochemical properties were studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectrometry (EIS). The results revealed that MnO2 synthesized in this work turned out to be δ-MnO2 of homogeneous dispersion and excellent electrochemical properties. Specific capacitance of 300.85 F/g was achieved for the 2% Ni-doped MnO2 at 2mV/s through cyclic voltammetry, and after 5000 circles the persistence rate of which still remained to 75%, exhibiting a preeminent advantage of stability and reversibility to naked MnO2.

scholarly journals One−Step Synthesis of Popcorn−Carbon/Co3O4 Composites as High−Performance Supercapacitor Electrodes

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 76
Author(s):  
Ruiyu Wang ◽  
Mengfan Zhang ◽  
Hao Xu ◽  
Shuo Guo ◽  
Mengqi Chi ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Electrochemical Properties ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Co3o4 Nanoparticles ◽  
X Ray ◽  
Plasma Electrolysis ◽  
One Step ◽  
Liquid Phase Plasma

In this study, a novel assisted liquid−phase plasma electrolysis was developed to realize one−step synthesis of popcorn biomass−derived porous carbon/cobalt tetroxide (popcorn−carbon/Co3O4) composites, effectively improving the structural stability and conductivity of Co3O4. The phase structure, morphologies, chemical composition, and weight ratio of the as−prepared popcorn−carbon/Co3O4 composites were systematically analyzed. The results of X−ray diffraction (XRD), Raman spectrometer, Fourier infrared spectrometer (FTIR), X−ray photoelectron spectrometer (XPS), and thermogravimetry analyzer (TG) proved the synthesis of the popcorn−carbon/Co3O4 composites. Co3O4 nanoparticles were distributed relatively uniformly on the popcorn−carbon surface. The electrochemical properties of the popcorn−carbon/Co3O4 composite electrode materials were analyzed for exploring the influence of different Co/C ratios on the electrochemical properties of composites. The results showed that the popcorn−carbon/Co3O4 composite electrode materials prepared under 200:1 mass ratio of Co(NO3)2·6H2O and popcorn−carbon possessed a specific capacitance and specific capacity of almost 1264 F/g (594 C/g) at a current density of 1 A/g, exhibiting a better electrochemical property. The efficient, fast, and novel assisted liquid−phase plasma electrolysis provides a new method for the preparation of composite electrode materials on the supercapacitors.

scholarly journals Synthesis and characterization of Ni2C: An efficient electrocatalyst towards hydrogen evolution reaction

2021 ◽  
Author(s):  
Sathish Vilvanathan ◽  
Roshini Gunasekaran
Keyword(s):  
Cyclic Voltammetry ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tafel Polarization ◽  
Nickel Carbide ◽  
One Step ◽  
Ft Ir

Abstract Ni2C electrocatalyst were synthesized and characterized for the Hydrogen Evolution Reaction (HER) electrolyzer. One step hydrothermal technique is used to synthesize Ni2C sample. Platinum based electro catalyst materials are initial and best electro catalyst for Hydrogen Evolution Reaction (HER). Ni2C (Nickel Carbide electro catalyst) was examined by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD). Electrochemical characterization like cyclic voltammetry (CV), Tafel polarization and electrochemical impedance spectroscopy (EIS) studies is employed to explore the elctrocatalytic behavior of Ni2C material for HER. FTIR study confirms the presence of Ni2C electrocatalyst by the presence of metal peaks and various functional groups. The isomeric nature and purity of synthesized material were explored by powder X-ray diffraction studies. Cyclic voltammetry technique was performed in 0.5 M H2SO4 solution to attain the polarization curve of Ni2C electrocatalyst for HER.

scholarly journals Synthesis, Structures and Electrochemical Properties of Lithium 1,3,5-Benzenetricarboxylate Complexes

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 126 ◽  
Author(s):  
Pei-Chi Cheng ◽  
Bing-Han Li ◽  
Feng-Shuen Tseng ◽  
Po-Ching Liang ◽  
Chia-Her Lin ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Electrode Materials ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Crystal Transformation ◽  
Discharge Capacities

Four lithium coordination polymers, [Li3(BTC)(H2O)6] (1), [Li3(BTC)(H2O)5] (2), [Li3(BTC)(μ2-H2O)] (3), and [Li(H2BTC)(H2O)] (4) (H3BTC = 1,3,5-benzenetricarboxylatic acid), have been synthesized and characterized. All the structures have been determined using single crystal X-ray diffraction studies. Complexes 1 and 2 have two-dimensional (2-D) sheets, whereas complex 3 has three-dimensional (3-D) frameworks and complex 4 has one-dimensional (1-D) tubular chains. The crystal-to-crystal transformation was observed in 1–3 upon removal of water molecules, which accompanied the changes in structures and ligand bridging modes. Furthermore, the electrochemical properties of complexes 3 and 4 have been studied to evaluate these compounds as electrode materials in lithium ion batteries with the discharge capacities of 120 and 257 mAhg−1 in the first thirty cycles, respectively.

Electrochemical performance of M3(BTC)2·12H2O (M=Co, Ni, and Zn) for Supercapacitors

2011 ◽  
Vol 15 (2) ◽  
pp. 79-82
Author(s):  
Chenmin Liao ◽  
Jiachang Zhao ◽  
Bohejin Tang ◽  
Aomin Tang ◽  
Yanhong Sun ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scan Rate ◽  
Metal Organic ◽  
Acetate Hydrate ◽  
Xrd Patterns ◽  
Maximum Specific Capacitance

A series of Metal-Organic Frameworks (MOFs) based on 1,3,5-benzenetricarboxylic (BTC) acid and M(II) acetate hydrate (M=Co, Ni, and Zn) were successfully synthesized and named as M3(BTC)2·12H2O. These compounds were examined by X-ray diffraction (XRD) patterns. Electrochemical properties of the materials were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in 6 M KOH aqueous solutions. The maximum specific capacitance of Ni3(BTC)2·12H2O is found to be 429 F g-1 at 5 mV s-1 and 154 F g-1 at 200 mV s-1 scan rate.

scholarly journals Analysis of Activated Carbon Monolith Derived from Carrot Juice Waste for Supercapacitor Electrode Application

2021 ◽  
Vol 10 (2) ◽  
pp. 26-31
Author(s):  
Dewi Ramayani ◽  
Yanuar Hamzah ◽  
Erman Taer ◽  
Novi Yanti ◽  
Afriwandi Apriwandi
Keyword(s):  
Cyclic Voltammetry ◽  
Fourier Transform ◽  
Activated Carbon ◽  
Energy Storage ◽  
Electrode Materials ◽  
Fourier Transform Infrared ◽  
Carrot Juice ◽  
X Ray Diffraction ◽  
X Ray ◽  
One Stage

Abstrak. Pengembangan sistem penyimpanan energi elektrokimia yang efektif dan efisien menjadi sangat penting pada era evolusi teknologi dan industri modern saat ini. Penelitian ini mengemukakan karbon aktif sebagai bahan dasar material elektroda untuk diaplikasikan pada piranti penyimpan energi, khsusunya superkapasitor melalui analisa densitas, X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) dan Cyclic Voltammetry (CV). Karbon aktif berbentuk monolit disiapkan dari ampas jus wortel melalui pendekatan pirolisis satu tahap terintegrasi dan aktivasi kimia KOH. Proses pirolisis satu tahap terintegrasi dilakukan melalui penggabungan karbonisasi dan aktivasi fisika dalam atmosfer gas N2/CO2. Berdasarkan analisis data, karbon aktif menunjukkan sifat amorf yang normal dan sifat porositas terkonfirmasi. Lebih lanjut, sifat elekrokimia dievaluasi menggunakan metode Cyclic Voltammetry (CV) pada sistem dua elektroda. Kapasitansi spesifik yang dihasilkan sebesar 155 F/g dalam elektrolit 1 M H2SO4 dengan energi spesifik dan daya spesifik adalah 21,52 Wh/kg dan 77,57 W/kg. Berdasarkan analisa ini maka ampas jus wortel terkonfirmasi berpotensi sebagai karbon aktif untuk elektroda yang diaplikasikan dalam piranti penyimpan energi superkapasitor.Abstract. The development of an effective and efficient electrochemical energy storage system is very important in today's era of technological evolution and the modern industry. This research suggests that activated carbon is the raw material for electrode materials to be applied to energy storage devices, especially supercapacitors through density analysis, X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), and Cyclic Voltammetry (CV). Activated carbon in the monolith form derived from carrot juice waste was prepared through a one-stage integrated pyrolysis approach and chemical activation of KOH. An integrated one-stage pyrolysis process was carried out by combining carbonization and physical activation in an N2/CO2 gas atmosphere. Based on data analysis, activated carbon performed normal amorphous behavior with confirmed porosity features. Furthermore, the electrochemical properties were evaluated using the Cyclic Voltammetry (CV) method at the two-electrode system. The specific capacitance was found as high as 155 F/g in the 1 M H2SO4 aqueous electrolyte with specific energy and specific power as high as 21.52 Wh/kg and 77.57 W/kg, respectively. Based on this analysis, the carrot juice waste has been confirmed to have the potential as activated carbon for the electrodes applied in supercapacitor energy storage technology.Keywords: Carrot Juice Waste, Activated Carbon, Electrode Materials, Supercapacitor

scholarly journals Valorization of Albedo Orange Peel Waste to Develop Electrode Materials in Supercapacitors for the Electric Industry

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Gladis G. Suárez ◽  
José A. Ramírez ◽  
Juan F. Castañón ◽  
Jorge A. Galavíz ◽  
Perla C. Meléndez
Keyword(s):  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Electrochemical Behaviour ◽  
Orange Peel ◽  
Activation Process ◽  
X Ray Diffraction ◽  
Electric Industry ◽  
X Ray ◽  
Orange Peel Waste ◽  
Ft Ir

This work proposes the use of albedo of orange peel in generation of carbon for applications in supercapacitors. For this, a comparison of compositional and electrochemical properties present in the carbons obtained of albedo, flavedo, and the complete orange peel was carried out. The morphology and composition of carbons obtained were analyzed by Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray (EDX), X-Ray Diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR). The synthetized carbons were not subjected to the activation process by chemical compounds to relate only the properties of orange peel parts with their electrochemical behaviour. All samples were tested by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The carbon obtained of albedo presented a superior specific capacitance (210 F/g) of the rest samples. The value of albedo-based carbon capacitance is comparable with works presented in the literature that used a whole orange peel with chemical activators. In this way, it is possible to obtain large capacitances using only a part of orange peel (albedo). Thus, the importance of this study is that the albedo can be proposed as a material applied to electrodes for supercapacitors while the flavedo can be used in food industry or for oil extraction.

Preparation of Co-B Alloy with the Assistance of the Sonication and its Electrochemical Properties

2017 ◽  
Vol 727 ◽  
pp. 751-755 ◽  
Author(s):  
Wei Zhao ◽  
Yi Lin Liao ◽  
Jian Ling Huang ◽  
Hai Liang Chu ◽  
Shu Jun Qiu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Chemical Reduction ◽  
Negative Electrode ◽  
Rechargeable Batteries ◽  
X Ray Diffraction ◽  
Discharge Current Density ◽  
Negative Electrode Materials

In order to enhance the electrochemical properties of Co-B alloys used as negative electrode materials of alkaline rechargeable batteries, Co-B alloy was successfully prepared by a chemical reduction method with the assistance of the sonication. The phase structure and the surface morphology of the as-prepared Co-B alloys were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen physisorption. Moreover, the electrochemical performance was characterized by galvonostatic charge-discharge tests, electrochemical impedance spectroscopy (EIS) and anodic polarization (AP). Co-B alloy prepared with the assistance of the sonication consists of small particles with a uniform distribution. The electrochemical measurements showed that at a discharge current density of 100 mA/g, the initial discharge capacity was 858.1 mAh/g and the discharge capacity was 322.6 mA/g even at the 100th cycle with the capacity retention of 37.6%.

Electro-Oxidation of Ethanol on the Preparation of Electroless Ni-P Alloy Electrode

2011 ◽  
Vol 311-313 ◽  
pp. 1361-1364
Author(s):  
Shu Guang Xie ◽  
Zhan Chang Pan ◽  
Guang Hui Hu ◽  
Zhi Gang Wei ◽  
Chu Min Xiao ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Catalytic Effect ◽  
Electrochemical Impedance ◽  
Textural Properties ◽  
Alloy Electrode ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electro Oxidation ◽  
Electroless Ni ◽  
Oxidation Of Ethanol

Ni-P alloy electrode was prepared by electroless plating on the Cu-Zn substrate. The surface morphology and textural properties of electrode were characterized by Scanning electron microscope(SEM), Energy dispersive spectroscopy(EDS) and X-ray diffraction(XRD). The performance of Ni-P alloy electrode was tested by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy.The results of cyclic voltammetry showed that: At room temperature, Ni-P alloy electrode had significant catalytic effect on the electrocatalytic oxidation of ethanol in alkaline solution. Results of chronoamperometry and electrochemical impedance spectroscopy further confirmed the catalytic effect of Ni-P alloy electrode on the electrochemical oxidation of ethanol.

scholarly journals Microwave-Assisted Synthesis and Characterization of γ-MnO2 for High-Performance Supercapacitors

2021 ◽  
Author(s):  
Lorena Cuéllar-Herrera ◽  
Elsa Arce-Estrada ◽  
Antonio Romero-Serrano ◽  
José Ortiz-Landeros ◽  
Román Cabrera-Sierra ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
High Performance ◽  
Pore Diameter ◽  
Electrochemical Impedance ◽  
High Specific Capacitance ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
20 Nm

AbstractTwo hydrothermal techniques under microwave irradiation were used to synthesize γ-MnO2 from 90°C to 150°C in 10−30 min. The first technique is based on reducing KMnO4 with MnSO4, and the second one involves liquid-phase oxidation between MnSO4 and (NH4)2S2O8. The structures and morphologies of the samples were analyzed using X-ray diffraction, scanning electron microscopy, and N2 physisorption measurements. The electrochemical properties were evaluated through cyclic voltammetry and electrochemical impedance spectroscopy. The γ-MnO2 materials obtained by the first technique mainly exhibited nanorods with diameters of 40–60 nm, and the samples obtained by the second technique showed flower-like microspheres with diameters of 1−2 µm; each flower was composed of nanosheets with a thickness of 10−20 nm. The processing time directly depends on the size of the nanorods. The sample synthesized by the first technique at 150°C and 10 min has the highest specific surface area of up to 59.08 m2 g−1 and mean pore diameter of 34.11 nm. Furthermore, this sample exhibits a near-rectangular cyclic voltammetry curves and high specific capacitance of 331.3 F g−1 in 0.1 M Na2SO4 solution at 5 mV s−1 scan rate. Graphic abstract

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