Controllable Synthesis of Nanostructured MnO2 as Electrode Material of Supercapacitors

2020 ◽  
Vol 20 (8) ◽  
pp. 4815-4823
Author(s):  
Yingying Huang ◽  
Duo Weng ◽  
Shumei Kang ◽  
Jinlin Lu
Keyword(s):  
Fourier Transform ◽  
Sulfuric Acid ◽  
Electrode Material ◽  
Chemical Method ◽  
Electrode Materials ◽  
Test System ◽  
Controllable Synthesis ◽  
Promising Candidate ◽  
X Ray ◽  
Structure Morphology

In this study, MnO2 with different nanostructures (nanorods, nanospheres, nanoflowers, nanolychee) were obtained using a facile chemical method by adding different amounts of sulfuric acid for application in supercapacitors. Structure, morphology and composition were examined by X-ray diffractometer, Brunauer-Emmett-Teller, Fourier transform infrared, etc. Electrochemistry performances were tested by Autolab and LANHE CT2001A test system. Results indicated that the nanoflower MnO2 (F-MnO2) exhibited largest specific surface area, which was 83.17 m2 g−1. Electrode materials were tested in different electrolytes, including 6.0 M KOH, 1.0 M LiNO3 and 1.0 M LiOH. The F-MnO2 electrode material displayed the best electrochemical properties, and its specific capacitance was 171 F g−1 at 1 A g−1. Moreover, F-MnO2 electrode material showed splendid cycling durability was 130.9% of original value after 1000 cycles. These results demonstrated that the F-MnO2 electrode material should be a promising candidate for application in supercapacitors.

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 The preparation and characterization of SnO2/rGO nanocomposites electrode materials for supercapacitor

2020 ◽  
Vol 29 ◽  
pp. 2633366X2090983 ◽  
Author(s):  
Yingtao Zhang ◽  
Manna Liu ◽  
Shishuai Sun ◽  
Liying Yang
Keyword(s):  
Fourier Transform ◽  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Tin Oxide ◽  
Electrode Materials ◽  
X Ray ◽  
Excellent Electrochemical Performance ◽  
Reduced Graphene ◽  
Scanning Electron

The ultrafine tin oxide (SnO2) nanorods/reduced graphene oxide (rGO) composites are synthesized by a two-step hydrothermal method. The prepared nanocomposites are characterized by scanning electron microscope, X-ray diffractometer, and Fourier transform infrared spectra. The results of electrochemical performance show that specific capacitance of the composite can reach 262.2 F g−1 at the current density of 100 mA g−1 in the 1 M Na2SO4 electrolyte. An initial capacitance retention of the composite is 96.1% after 6000 cycles, indicating its excellent electrochemical performance.

scholarly journals Cost-Effective Synthesis of Efficient CoWO4/Ni Nanocomposite Electrode Material for Supercapacitor Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2195
Author(s):  
Kannadasan Thiagarajan ◽  
Dhandapani Balaji ◽  
Jagannathan Madhavan ◽  
Jayaraman Theerthagiri ◽  
Seung Jun Lee ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrode Material ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Supporting Electrolyte ◽  
Cost Effective ◽  
X Ray ◽  
Transmission Electron ◽  
Effective Synthesis ◽  
Supercapacitor Applications

In the present study, the synthesis of CoWO4 (CWO)–Ni nanocomposites was conducted using a wet chemical method. The crystalline phases and morphologies of the Ni nanoparticles, CWO, and CWO–Ni composites were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDAX). The electrochemical properties of CWO and CWO–Ni composite electrode materials were assessed by cyclic voltammetry (CV), and galvanostatic charge–discharge (GCD) tests using KOH as a supporting electrolyte. Among the CWO–Ni composites containing different amounts of Ni1, Ni2, and Ni3, CWO–Ni3 exhibited the highest specific capacitance of 271 F g−1 at 1 A g−1, which was greater than that of bare CWO (128 F g−1). Moreover, the CWO–Ni3 composite electrode material displayed excellent reversible cyclic stability and maintained 86.4% of its initial capacitance after 1500 discharge cycles. The results obtained herein demonstrate that the prepared CWO–Ni3 nanocomposite is a promising electrode candidate for supercapacitor applications.

scholarly journals Methods for operando coherent X-ray diffraction of battery materials at the Advanced Photon Source

2019 ◽  
Vol 26 (1) ◽  
pp. 220-229 ◽  
Author(s):  
Luxi Li ◽  
Yingying Xie ◽  
Evan Maxey ◽  
Ross Harder
Keyword(s):  
Single Crystals ◽  
Electrode Material ◽  
Electrode Materials ◽  
Structural Information ◽  
Crystal Form ◽  
X Ray Diffraction ◽  
Diffractive Imaging ◽  
X Ray ◽  
The Individual ◽  
Photon Source

Bragg coherent X-ray diffraction imaging has become valuable for visualization of the structural, morphological and strain evolution of crystals in operando electrode materials. As the electrode material particles (either in a single-crystal form or an aggregation form of single crystals) are evenly dispersed and randomly oriented in the electrode laminate, the submicrometer-sized coherentX-ray beam can be used to probe the local properties of electrode material crystals using two approaches. Coherent multi-crystal diffraction provides collective structural information of phase transitions in tens of crystals simultaneously as well as the individual behavior from single crystals, which are oriented at the Bragg condition in the X-ray illumination volume. Bragg coherent diffractive imaging enables one to monitor the evolution of the morphology and strain in individual crystals. This work explores and highlights the Bragg coherent X-ray diffraction measurements of battery electrode materials in operando conditions at the 34-ID-C beamline at the Advanced Photon Source. The experiment is demonstrated with NaNi1/3Fe1/3Mn1/3O2, a sodium-ion cathode material loaded in a half cell. The paper will discuss, in detail, the beamline setup, sample mounting and handling, alignment strategies and the data acquisition protocols.

scholarly journals Synthesis and Characterization of Na Doped ZnO Rods Grown by Simple Chemical Method

2020 ◽  
Vol 26 (4) ◽  
pp. 387-391
Author(s):  
Sibel MORKOÇ KARADENİZ ◽  
Hatice Kübra BÖLÜKBAŞI ÇIPLAK ◽  
Ali Ercan EKİNCİ
Keyword(s):  
Optical Properties ◽  
Chemical Method ◽  
Zinc Nitrate ◽  
Zno Films ◽  
Nitrate Hexahydrate ◽  
X Ray ◽  
Structure Morphology ◽  
Simple Chemical ◽  
Doped Zno

In this study, the effects of Na doped on the structure, morphology, and optical properties of the ZnO films deposited on glass substrate were investigated. The films were synthesized on glass substrates via a simple chemical method. Undoped and Na-doped ZnO films were obtained from an aqueous solution of the Zinc nitrate hexahydrate (Zn(NO3)2·6H2O), Sodium Nitrate (NaNO3) and hexamethylenetetramine-HMT (C6H12N4). Characterization of the films was examined using a Scanning electron microscope (SEM) and X-ray diffractometer (XRD), Ultraviolet-Visible spectrophotometer (UV-Vis) and X-Ray Photoelectron (XPS). The structure, morphology, and optical properties of the films were presented. The wurtzite ZnO films showed rod arrays morphology. The optical band gap increased with the doping of Na metal. The result shows that Na addition affected the properties of the ZnO films.

Partially Graphitized Iron-Carbon Hybrid Composite as Electrochemical Supercapacitor Material

2020 ◽  
Author(s):  
Sai Rashmi M. ◽  
Ashish Singh ◽  
Chandra sekhar Rout ◽  
Akshaya Samal ◽  
Manav Saxena
Keyword(s):  
Iron Oxide ◽  
Current Density ◽  
Electrode Material ◽  
High Performance ◽  
Electrode Materials ◽  
Carbon Composite ◽  
X Ray ◽  
Transmission Electron ◽  
Excellent Property ◽  
A Current

<p>The conversion of biomass into valuable carbon composites as an efficient non-precious energy storage electrode material have elicited extensive research interest. As synthesized partially graphitized iron oxide-carbon composite material (Fe<sub>3</sub>O<sub>4</sub>/Fe<sub>3</sub>C@C) shows an excellent property as an electrode material for supercapacitor. X-ray diffraction, High resolution transmission electron microscopy, X-ray photo-electron spectroscopy and Brunauer-Emmett-Teller analysis is used to study the structural, compositional and surface areal properties. The electrode material shows a specific surface area of 827.4 m<sup>2</sup>/g. Due to the synergistic effect of graphitic layers with iron oxide/carbide, Fe<sub>3</sub>O<sub>4</sub>/Fe<sub>3</sub>C@C hybrid electrode materials display high-performance for supercapacitor with excellent capacity of 878 F/g at a current density of 5A/g (3-electrode) and 211.6 F/g at a current density of 0.4A/g (2-electrode) in 6M KOH electrolyte with good cyclic stability.</p>

Nitrogen-enriched activated carbons from waste particleboard used as electrode materials for supercapacitors: effects of activating agent on surface characteristics

RSC Advances ◽  
2015 ◽  
Vol 5 (63) ◽  
pp. 50843-50850 ◽  
Author(s):  
T. X. Shang ◽  
J. Zhang ◽  
F. L. Fan ◽  
X. J. Jin
Keyword(s):  
Activated Carbon ◽  
Electrode Material ◽  
Electrode Materials ◽  
Activated Carbons ◽  
Rate Capability ◽  
Surface Characteristics ◽  
Carbon Electrodes ◽  
Promising Candidate ◽  
Activating Agent ◽  
Good Rate Capability

The nitrogen-enriched activated carbon electrodes prepared from waste particleboard exhibits high gravimetric specific capacitances, good rate capability, and excellent lone-term stability, making such electrode material a promising candidate for supercapacitors.

scholarly journals Unveiling Pseudocapacitive Charge Storage Behavior in FeWO4 Electrode Material by Operando X-ray Absorption Spectroscopy

2019 ◽  
Author(s):  
Nicolas Goubard-Bretesché ◽  
Olivier Crosnier ◽  
Camille Douard ◽  
Antonella Iadecola ◽  
Richard Retoux ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Electrode Material ◽  
Electrode Materials ◽  
Full Description ◽  
Charge Storage ◽  
X Ray ◽  
Storage Mechanism ◽  
Storage Behavior ◽  
Charge Storage Mechanism ◽  
X Ray Absorption

In nano-sized FeWO<sub>4</sub> electrode material, both Fe and W metal cations are suspected to be involved in the fast and reversible Faradaic surface reactions giving rise to its pseudocapacitive signature. As for any other pseudocapacitive materials, to fully understand the charge storage mechanism, a deeper insight into the involvement of the electroactive cations still has to be provided. The present paper illustrates how operando X-ray absorption spectroscopy (XAS) has been successfully used to collect data of unprecedented quality allowing to elucidate the complex electrochemical behavior of this multicationic pseudocapacitive material. Moreover, these in-depth experiments were obtained in real time upon cycling the electrode, which allowed investigating the reactions occurring in the material within a realistic timescale, which is compatible with electrochemical capacitors practical operation. Both Fe K-edge and W L<sub>3</sub>-edge measurements point out the involvement of the Fe<sup>3+</sup>/Fe<sup>2+</sup> redox couple in the charge storage while W<sup>6+</sup> acts as a spectator cation. The result of this study enables to unambiguously discriminate between the Faradaic and capacitive behavior of FeWO4. Beside these valuable insights toward the full description of the charge storage mechanism in FeWO<sub>4</sub>, this paper demonstrates the potential of operando X-ray absorption spectroscopy to enable a better material engineering for new high capacitance pseudocapacitive electrode materials.

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.

Controllable synthesis of mesoporous carbon nanoparticles based on PAN-b-PMMA diblock copolymer micelles generated via RAFT polymerization as electrode materials for supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (105) ◽  
pp. 103843-103850 ◽  
Author(s):  
Aitang Zhang ◽  
Aihua Li ◽  
Yao Wang ◽  
Mengli Liu ◽  
Hongjing Ma ◽  
...  
Keyword(s):  
Emulsion Polymerization ◽  
Diblock Copolymer ◽  
Electrode Material ◽  
Carbon Nanoparticles ◽  
Mesoporous Carbon ◽  
Electrode Materials ◽  
Raft Polymerization ◽  
Controllable Synthesis ◽  
Copolymer Micelles

PAN-b-PMMA micelles were synthesized via RAFT emulsion polymerization, followed by carbonization to form mesoporous carbon nanoparticles (MCNs). The as-prepared MCNs were exploited as electrode material for supercapacitors.

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