High-Rate Charge-Discharge Performances of β-FeOOH-Carbon Composite Electrodes

2006 ◽  
Vol 301 ◽  
pp. 139-142 ◽  
Author(s):  
Hideyuki Morimoto ◽  
Kazuhiko Takeno ◽  
Yuuki Uozumi ◽  
Kenichi Sugimoto ◽  
Shinichi Tobishima
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Electrode Material ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Fine Particles ◽  
High Rate ◽  
Carbon Powder ◽  
Discharge Current Density ◽  
Charge Discharge

Composite electrode material of crystalline b-FeOOH and carbon was prepared by hydrolyzing of FeCl3 (aq.) in which carbon powder with various specific surface areas was dispersed. Composite electrode material of b-FeOOH fine particles and Ketjen black (KB:specific surface area 1270 m2 g-1) of high specific surface area exhibited the high capacity over 250 mAh g-1 per b-FeOOH weight and good cycle performances at rapid charge-discharge current density over 5 mA cm-2 (ca. 5.0 A g-1 per b-FeOOH weight) in nonaqueous electrolytes including lithium ions. Composite electrode materials of crystalline b-FeOOH and carbon are one of the promising candidates as electrode materials for energy storage devices that high-power operations are required.

Synthesis of composite electrode materials of FeOOH-based particles/carbon powder and their high-rate charge–discharge performance in lithium cells

2011 ◽  
Vol 196 (15) ◽  
pp. 6512-6516 ◽  
Author(s):  
Hideyuki Morimoto ◽  
Kazuhiko Takeno ◽  
Yuuki Uozumi ◽  
Ken-ichi Sugimoto ◽  
Shin-ichi Tobishima
Keyword(s):  
Composite Electrode ◽  
Electrode Materials ◽  
High Rate ◽  
Carbon Powder ◽  
Discharge Performance ◽  
Charge Discharge ◽  
Lithium Cells

High-Rate Charge-Discharge Performance of Composite Electrodes of FeOOH-Based Amorphous Particles and Carbon Powder

2008 ◽  
Vol 388 ◽  
pp. 33-36
Author(s):  
Hideyuki Morimoto ◽  
Kazuhiko Takeno ◽  
Tsuyoshi Takahashi ◽  
Kensaku Hayashi ◽  
Shinichi Tobishima
Keyword(s):  
Heat Treatment ◽  
Electrode Materials ◽  
High Rate ◽  
Cycle Performance ◽  
Carbon Powder ◽  
Composite Electrodes ◽  
Discharge Current Density ◽  
Discharge Performance ◽  
Amorphous Particles ◽  
Charge Discharge

Composite electrode materials of amorphous FeOOH-based particles and carbon powder were prepared by heat treatment of composite powder obtained by hydrolyzing of mixed aqueous solutions of FeCl3 and Ti(SO4)2 into which electron conducting carbon powder was dispersed. They exhibited high capacities over 150 mAh g-1 and good cycle performance at large charge-discharge current density of 5 mA cm-2 (ca. 1 A g-1). In this case, the heat treatment was effective process to improve the cycle performance.

High-Rate Charge-Discharge Performance of Composite Materials of β-FeOOH Particles and Carbon Powder Prepared in the Presence of Ti(IV) Ions

2006 ◽  
Vol 320 ◽  
pp. 215-218
Author(s):  
Hideyuki Morimoto ◽  
Kazuhiko Takeno ◽  
Yuuki Uozumi ◽  
Kenichi Sugimoto ◽  
Shinichi Tobishima
Keyword(s):  
Composite Materials ◽  
Electrode Materials ◽  
Active Material ◽  
High Rate ◽  
Cycle Performance ◽  
Carbon Powder ◽  
Energy Storage Devices ◽  
Discharge Current Density ◽  
Discharge Performance ◽  
Charge Discharge

Composite materials of β-FeOOH particles and carbon powder were prepared by hydrolyzing of FeCl3+Ti(SO4)2 (aq.) in which carbon powder was dispersed. β-FeOOH formed in the presence of Ti(IV) ions became amorphous and/or low crystallinity. The composite materials prepared in the presence of Ti(IV) ions worked as lithium intercalation electrodes in nonaqueous electrolytes including lithium ions. The electrodes exhibited a good cycle performance at large charge-discharge current density over 5 mA cm-2 ( 4 A g-1 per weight of active material). The composite materials are one of the promising candidates as electrode materials for energy storage devices, such as hybrid electrochemical supercapacitor, that require high-power operations.

Influence of the Support on the Morphology of Co-Sn, Ni-Sn, Co-Ni Nanoparticles Synthesized Through a Borohydride Reduction Method Applying a Template Technique

2018 ◽  
Vol 55 (1) ◽  
pp. 82-91
Author(s):  
I. N. Markova ◽  
M. B. Piskin ◽  
I. Z. Zahariev ◽  
E. Hristoforou ◽  
V. L. Milanova ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Electrode Materials ◽  
Carbon Support ◽  
Carbon Powder ◽  
Ni Nanoparticles ◽  
Borohydride Reduction ◽  
Carbon Supports ◽  
Intermetallic Nanoparticles

Abstract Intermetallic (Co-Sn, Ni-Sn, Co-Ni) nanoparticles have been synthesized through a borohydride reduction with NaBH4 in aqueous solutions of the chloride salts of Co, Ni, Sn at room temperature using a template technique with a carbon support. As a result nanocomposite materials have been obtained in situ. The ratio of the metallic components has been chosen according the phase diagrams of the relevant binary (Co-Sn, Ni-Sn, Co-Ni) systems: Co:Sn=35:65, Ni:Sn=45:55, Co:Ni=50:50. As carbon supports have been used graphite and carbon powder. To avoid the nanoparticle’s aggregation b-cyclodextrin has been added to the reaction solutions. To study the influence of the supports used on the morphology, specific surface area, elemental and phase composition of the synthesized intermetallic nanoparticles and their carbon nanocomposites SEM, EDS, BET, and XRD investigation techniques have been used. The particle’s morphology varies with the different supports, but in the all cases it is typical for alloyed materials. The nanoparticles are different in shape and size and exhibit a tendency to aggregate. The last-one is due to the unsaturated nanoparticle’s surface and the existing magnetic forces. Regardless of the elemental composition, the nanosized particles are characterized by a relatively high specific surface area (SSA). The Ni-Sn nanoparticle have the largest SSA (80 m2/g), while the Co-Sn particles have the lowest SSA (69 m2/g). The use of a carrier modifies the SSA of the resulting nanocomposites differently depending on the size and shape of the carrier’s particles. The studies conducted on the intermetallic nanoparticles synthesized with various carriers demonstrate that the particle’s morphology, size, and specific surface area for the different supports are suitable for use as catalysts, electrode materials in Li-ion batteries and as magnetic materials for biomedical applications.

The Effect of Support on the Electrochemical Performance of Composite Electrode Materials for Supercapacit

2011 ◽  
Vol 239-242 ◽  
pp. 1010-1013 ◽  
Author(s):  
Yan Hong Sun ◽  
Jia Chang Zhao ◽  
Hong Hua Zhou ◽  
Bo He Jin Tang ◽  
Yu Qing Gu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Specific Capacitance ◽  
Surface Area ◽  
Specific Surface Area ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Incipient Wetness Impregnation ◽  
Nickel Compounds ◽  
Effect Of Support

Composite electrode materials for supercapacitor were prepared by a combination of incipient wetness impregnation and hydrothermal method in this study. The materials were characterized by XRD, specific surface area and electrochemical testing. The effect of support on the electrochemical performance of the composite electrode materials was investigated. The result shows that the samples prepared by different supports contain nickel nitrate hydroxide hydrate (the electroactive material in the composite) and undecomposed nickel nitrate.The specific surface area decrease after the loading of nickel compounds, which indicates the exisitance of nickel compounds in the pores. The composite prepared by using diatomite support exhibits higher specific capacitance than those prepared by using SBA-15 and Ti-Si molecular sieve, which delivers the specific capacitance of 1162.77 F/g at the scan rate of 5 mV/s.

Acid-based modified NiCo2O4 as high-performance supercapacitor electrode materials

2021 ◽  
pp. 2150200
Author(s):  
Wenbo Geng ◽  
Qing Wang ◽  
Jianfeng Dai ◽  
Haoran Gao
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Electrode Material ◽  
High Performance ◽  
Electrode Materials ◽  
Alkali Treatment ◽  
Treatment Method ◽  
Supercapacitor Electrode ◽  
Supercapacitor Electrode Materials

The performance of supercapacitor electrode materials was greatly affected by the specific surface area. The urchin-like NiCo2O4 was transformed into porous NiCo2O4 (AA-NiCo2O[Formula: see text] using the acid–alkali treatment method. The specific surface area of AA-NiCo2O4 was 165.0660 m2/g, which was about three times larger than that of NiCo2O4. The specific capacitance of the AA-NiCo2O4 was enhanced significantly (1700 F/g at 1 A/g), and AA-NiCo2O4 possesses good rate capacitance (1277 F/g at 10 A/g). This is mainly attributed to the larger specific surface area, fast and convenient electron–ion transport and redox reaction. Therefore, AA-NiCo2O4 is a promising high-performance supercapacitor electrode material.

scholarly journals Nanofiber NiMoO4/g-C3N4 Composite Electrode Materials for Redox Supercapacitor Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 392 ◽  
Author(s):  
Kannadasan Thiagarajan ◽  
Thirugnanam Bavani ◽  
Prabhakarn Arunachalam ◽  
Seung Jun Lee ◽  
Jayaraman Theerthagiri ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrode Material ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Galvanostatic Charge ◽  
Transmission Electron ◽  
Cd Studies ◽  
Supercapacitor Applications ◽  
Charge Discharge

NiMoO4/g-C3N4 was fabricated by a hydrothermal method and used as an electrode material in a supercapacitor. The samples were characterized by XRD, FTIR, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to study the physical and structural properties of the as-prepared NiMoO4/g-C3N4 material. The electrochemical responses of pristine NiMoO4 and the NiMoO4/g-C3N4 nanocomposite material were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). From the CD studies, the NiMoO4/g-C3N4 nanocomposite revealed a higher maximum specific capacitance (510 Fg−1) in comparison to pristine NiMoO4 (203 Fg−1). In addition, the NiMoO4/g-C3N4 composite electrode material exhibited high stability, which maintained up to 91.8% capacity even after 2000 charge-discharge cycles. Finally, NiMoO4/g-C3N4 was found to exhibit an energy density value of 11.3 Whkg−1. These findings clearly suggested that NiMoO4/g-C3N4 could be a suitable electrode material for electrochemical capacitors.

scholarly journals Application of Porous Carbon Material As Electrode Material of Polyvalent Cation Electric Double Layer Capacitor (EDLC) for High Capacity

2020 ◽  
Author(s):  
Tsubasa Okamura ◽  
Kiyoharu Nakagawa
Keyword(s):  
Energy Density ◽  
Specific Surface ◽  
Surface Area ◽  
Double Layer ◽  
Specific Surface Area ◽  
Electrode Material ◽  
Electric Double Layer ◽  
Electrode Materials ◽  
Power Supplies ◽  
Adsorption And Desorption

Electric double layer capacitors (EDLC) are charged and discharged by the physical adsorption and desorption of electrolyte ions on the electrode surface. EDLC has the advantages of high-speed charge and discharge and long life. EDLC is used in memory backup power supplies such as personal computers and energy regenerative systems for power regenerative brakes in hybrid vehicles. In recent years, demand for applications such as in-vehicle power supplies has increased. Therefore, high energy density is required. The energy density increases by increasing the electrostatic capacity and the potential. In the conventional adsorption and desorption of monovalent cations, only one electron can be exchanged for each cation. In adsorption and desorption, two electrons can be exchanged for each cation. Therefore, it was considered that the capacitance can be increased by using an electrolyte of divalent cations.In this study, Ca2+ was used as the divalent cation. As an organic electrolyte, propylene carbonate (PC) and γ-butyrolactone (GBL), which are commonly used in EDLC research as a solvent and can dissolve the electrolyte used. In addition, the dependence of the specific surface area and pore characteristics of the electrode material on the capacity was examined. Activated carbon and carbon gel were used as electrode materials. The capacitance of Ca2+ electrolyte increased when GBL was used as the solvent. Capacitance increased depending on the specific surface area of electrode materials.

Design of ZnMoO4 porous nanosheet with oxygen vacancy as better performance electrode material for supercapacitor

2021 ◽  
Author(s):  
Pengxi Li ◽  
Jiepeng Wang ◽  
Liming Li ◽  
Shili Song ◽  
Xianming Yuan ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Oxygen Vacancy ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Electrode Material ◽  
Reduction Method

ZnMoO4 with oxygen vacancy (ZnMoO4-OV) porous nanosheet was synthesized by hydrothermal synthesis and hydrogenation reduction method. The ZnMoO4-OV porous nan sheet delivers a higher specific surface area together with a...

scholarly journals New Electrodes Prepared from Mineral and Plant Raw Materials of Kazakhstan

2016 ◽  
Vol 18 (2) ◽  
pp. 141 ◽  
Author(s):  
A.A. Atchabarova ◽  
R.R. Tokpayev ◽  
A.T. Kabulov ◽  
S.V. Nechipurenko ◽  
R.A. Nurmanova ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Electrode Materials ◽  
Raw Materials ◽  
Hydrothermal Carbonization ◽  
Walnut Shell ◽  
High Background ◽  
Plant Raw Materials ◽  
Developed Surface

<p>Electrode materials were prepared from activated carbonizates of walnut shell, apricot pits and shungite rock from “Bakyrchik” deposit, East Kazakhstan. Physicochemical characteristics of the obtained samples were studied by the Brunauer-Emett-Taylor method, scanning electron microscopy, Raman spectroscopy and other methods. Electrochemical properties of the obtained materials were studied by the method of cyclic voltammetry. It was found that the samples have an amorphous structure. Samples based on plant raw materials after hydrothermal carbonization at 240 °С during 24 h, have more homogeneous and developed surface. Specific surface area of carbon containing materials based on apricot pits is 1300 m<sup>2</sup>/g, for those on the based on mineral raw material, it is 153 m<sup>2</sup>/g. It was shown that materials after hydrothermal carbonization can be used for catalytic purposes and electrodes after thermal carbonization for analytical and electrocatalytic purposes. Electrode obtained by HTC have electrocatalytic activity. CSC 240 has high background current (slope i/Е is 43 mА V<sup>–1</sup> cm<sup>–2</sup>), low potential of the hydrogen electroreduction (more positive by ~ 0.5 V than samples based on plant raw materials). The reaction of DA determination is more pronounced on the electrodes obtained by HTC 240 °C, 24 h, due to the nature, carbon structure and high specific surface area of obtained samples.</p>

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