Binary vanadium pentoxide carbon-graphene foam composites derived from dark red hibiscus sabdariffa for advanced asymmetric supercapacitor

2021 ◽  
Vol 379 (2209) ◽  
Author(s):  
B. D. Ngom ◽  
N. M. Ndiaye ◽  
N. F. Sylla ◽  
B. K. Mutuma ◽  
N. Manyala ◽  
...  
Keyword(s):  
Vanadium Pentoxide ◽  
Specific Energy ◽  
Electrode Materials ◽  
Negative Electrode ◽  
Specific Power ◽  
Portable Devices ◽  
Energy Storage Devices ◽  
Graphene Foam ◽  
High Specific Energy ◽  
Asymmetric Device

The development of advanced electrode materials derived from biomass for the next generation of energy storage devices, such as supercapacitors with high specific energy and specific power coupled with a good cycle stability, is required to meet the high demand for electric vehicles and portable devices. In this study, sustainable binary vanadium pentoxide carbon-graphene foam composites (V 2 O 5 @C-R 2 HS/GF) were synthesized using a solvothermal method. The X-ray diffraction, Raman and FTIR techniques were used to study the structural properties of the composites (V 2 O 5 @C-R 2 HS/20 mg GF and V 2 O 5 @C-R 2 HS/40 mg GF). The SEM micrographs displayed an accordion-like morphology resulting from the graphene foam-modified V 2 O 5 @C-R 2 HS composite. The V 2 O 5 @C-R 2 HS, V 2 O 5 @C-R 2 HS/20 mg GF and V 2 O 5 @C-R 2 HS/40 mg GF composites were evaluated in a three-electrode configuration using 6 M potassium hydroxide (KOH) as an aqueous electrolyte. Furthermore, a two-electrode device was carried out by fabricating an asymmetric device (V 2 O 5 @C-R 2 HS/GF//AC) where V 2 O 5 @C-R 2 HS/20 mg GF was used as a positive electrode and activated carbon (AC) as a negative electrode at a cell voltage of 1.6 V in 6 M KOH. The V 2 O 5 @C-R 2 HS/GF//AC showed a high specific energy and specific power values of 55 W h kg −1 and 707 W kg −1 , respectively, at a specific current of 1 A g −1 . The asymmetric device presented a good stability test showing 99% capacity retention up to 10 000 cycles and was confirmed by the floating time up to 150 h with specific energy increasing 23.6% after the first 10 h. This article is part of the theme issue ‘Bio-derived and bioinspired sustainable advanced materials for emerging technologies (part 2)’.

CuCo2O4 nanoparticles wrapped in a rGO aerogel composite as an anode for a fast and stable Li-ion capacitor with ultra-high specific energy

2021 ◽  
Author(s):  
Muhammad Sajjad ◽  
Muhammad Sufyan Javed ◽  
Muhammad Imran ◽  
Zhiyu Mao
Keyword(s):  
Specific Energy ◽  
Specific Power ◽  
Practical Application ◽  
Aerogel Composite ◽  
Li Ion ◽  
High Specific Energy ◽  
Application Requirements

To meet practical application requirements, high specific energy and specific power and excellent cyclability are highly desired.

scholarly journals AlCl3-Graphite Intercalation Compounds as Negative Electrode Materials in Lithium-ion Capacitors

2021 ◽  
Author(s):  
Yamato Haniu ◽  
Hiroki Nara ◽  
Seongki Ahn ◽  
Toshiyuki Momma ◽  
Wataru Sugimoto ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electric Double Layer ◽  
Electrode Materials ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Graphite Intercalation ◽  
Double Layer Capacitors ◽  
Negative Electrode Materials

Lithium-ion capacitors (LICs) are energy storage devices that bridge the gap between electric double-layer capacitors and lithium-ion batteries (LIBs). A typical LIC cell is composed of a capacitor-type positive electrode...

scholarly journals High Specific Energy Li7La3Zr2O12 Solid Electrolyte Based Thermal Battery

2021 ◽  
Author(s):  
Min Yang ◽  
Licai Fu ◽  
Zeshunji Luo ◽  
Jiajun Zhu ◽  
Wulin Yang ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Specific Energy ◽  
Internal Resistance ◽  
Specific Power ◽  
Thermal Battery ◽  
Application Range ◽  
Large Current ◽  
High Specific Energy ◽  
First Time ◽  
High Voltage Discharge

Abstract Garnet-type Ta-doped Li7La3Zr2O12 (LLZTO) solid electrolyte has been widely investigated for secondary Li ionic or metal batteries at ambient temperature. Because of the increasing ionic conductivity of LLZTO with temperature, we applied the LLZTO solid electrolyte to thermal battery working at 550℃. The LLZTO presents ultrahigh specific energy as the discharge specific energy and specific power is 605 W h/kg and 2.74 kW/kg at 100 mA/cm2 with a cut-off voltage of 1.8 V, respectively. This is larger than the LiF–LiCl-LiBr electrolyte which is commonly used in thermal battery with a specific energy of 514 W h/kg. The internal resistance of the single cell reaches 0.65 Ω, but the specific energy remains at about 400 W h/kg as the current density increases to 400 mA/cm2. We report the application of LLZTO in thermal battery with high specific energy, large current, and high voltage discharge for the first time, broadening the application range of solid electrolytes.

Review of Energy and Power of Supercapacitor Using Carbon Electrodes from Fibers of Oil Palm Fruit Bunches

2016 ◽  
Vol 846 ◽  
pp. 497-504 ◽  
Author(s):  
Mohamad Deraman ◽  
Najah Syahirah Mohd Nor ◽  
Erman Taer ◽  
Baharudin Yatim ◽  
Awitdrus ◽  
...  
Keyword(s):  
Specific Energy ◽  
Oil Palm ◽  
Electrode Materials ◽  
Short Review ◽  
Specific Power ◽  
Storage Process ◽  
Palm Fruit ◽  
Empty Fruit Bunches ◽  
Porous Carbon Electrode ◽  
Power Capability

Energy and power capability of a supercapacitor is important because of its function to provide backup power or pulse current in electronic/electric products or systems. The choice of its electrode materials, typically such as carbon, metal oxide or conducting polymer determines the mechanism of its energy storage process. This short review focuses on the supercapacitors using porous carbon electrode prepared, respectively, from fibers of oil palm empty fruit bunches. The specific energy and specific power of these supercapacitors were analyzed to observe their trend of change with respect to the electrode preparation parameters affecting the porosity, structure, surface chemistry and electrical conductivity of electrodes, and thence influence the energy and power capability of a supercapacitor. This review found that the trend of change in specific energy and specific power was not in favor of the expectation that both the specific energy and specific power should be in increasing trend with a significant progress.

scholarly journals Enhanced Electrochemical Behavior of Peanut-Shell Activated Carbon/Molybdenum Oxide/Molybdenum Carbide Ternary Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1056
Author(s):  
Ndeye F. Sylla ◽  
Samba Sarr ◽  
Ndeye M. Ndiaye ◽  
Bridget K. Mutuma ◽  
Astou Seck ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electrochemical Performance ◽  
Molybdenum Oxide ◽  
Specific Energy ◽  
Porous Carbon ◽  
Molybdenum Carbide ◽  
Electrode Materials ◽  
Specific Power ◽  
Peanut Shell ◽  
Symmetric Supercapacitor

Biomass-waste activated carbon/molybdenum oxide/molybdenum carbide ternary composites are prepared using a facile in-situ pyrolysis process in argon ambient with varying mass ratios of ammonium molybdate tetrahydrate to porous peanut shell activated carbon (PAC). The formation of MoO2 and Mo2C nanostructures embedded in the porous carbon framework is confirmed by extensive structural characterization and elemental mapping analysis. The best composite when used as electrodes in a symmetric supercapacitor (PAC/MoO2/Mo2C-1//PAC/MoO2/Mo2C-1) exhibited a good cell capacitance of 115 F g−1 with an associated high specific energy of 51.8 W h kg−1, as well as a specific power of 0.9 kW kg−1 at a cell voltage of 1.8 V at 1 A g−1. Increasing the specific current to 20 A g−1 still showcased a device capable of delivering up to 30 W h kg−1 specific energy and 18 kW kg−1 of specific power. Additionally, with a great cycling stability, a 99.8% coulombic efficiency and capacitance retention of ~83% were recorded for over 25,000 galvanostatic charge-discharge cycles at 10 A g−1. The voltage holding test after a 160 h floating time resulted in increase of the specific capacitance from 74.7 to 90 F g−1 at 10 A g−1 for this storage device. The remarkable electrochemical performance is based on the synergistic effect of metal oxide/metal carbide (MoO2/Mo2C) with the interconnected porous carbon. The PAC/MoO2/Mo2C ternary composites highlight promising Mo-based electrode materials suitable for high-performance energy storage. Explicitly, this work also demonstrates a simple and sustainable approach to enhance the electrochemical performance of porous carbon materials.

Modeling Ionic Liquid Based Electrolytes for Lithium Batteries

2013 ◽  
Author(s):  
Soumik Banerjee
Keyword(s):  
Ionic Liquids ◽  
Energy Storage ◽  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Specific Energy ◽  
Lithium Salt ◽  
Lithium Ion ◽  
Ionic Species ◽  
Specific Power ◽  
Energy Storage Devices

Based on ever-growing societal demand for stable energy supply, recent times have witnessed an increasing emphasis on developing energy storage devices such as batteries with improved specific energy and specific power. Among the myriad energy-storage technologies, rechargeable lithium ion batteries are widely used as energy sources for a range of portable electronic devices because of their relatively high specific energy storage capabilities [1]. However, the highest energy storage capacity achieved by a state-of-the-art lithium ion battery is too low to meet current demands in larger applications such as in the automotive industry [1]. The limitation is due, in part, to the limited ionic conductivity of currently used organic electrolytes coupled with their volatility, electrochemical instability and flammability, which raises safety concerns. The development of new generation of lithium ion batteries with significantly improved energy storage would require the selection of novel electrolyte materials with improved performance without compromising on safety standards. In recent years, there has been growing interest in the development of room temperature ionic liquids because they have extremely low vapor pressure, are stable at high temperatures, are highly resistant to oxidation and reduction, possess high ionic conductivity and have tunable electrochemical properties. However, the ionic conductivity of ionic liquids doped with lithium salt is extremely sensitive to the molecular structure of the ions as well as the extent of coordination between neighboring ionic species. In an effort to understand how atomistic interactions determine transport properties of ionic liquids, in the current study, we simulated lithium salt doped pyrrolidinium based ionic liquids using fundamental atomistic simulations. Properties such as density and self-diffusion coefficients were determined from molecular dynamics simulations and compared to experimental data to validate our model. Our simulations indicate that the mobility of lithium ions is limited due to association with multiple salt anions.

scholarly journals Functionalized Carbon Nanotube and MnO2 Nanoflower Hybrid as an Electrode Material for Supercapacitor Application

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 213
Author(s):  
Sagar Mothkuri ◽  
Honey Gupta ◽  
Pawan K. Jain ◽  
Tata Narsinga Rao ◽  
Gade Padmanabham ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Specific Energy ◽  
Hybrid Material ◽  
Electrode Material ◽  
Electrode Materials ◽  
Electrochemical Analysis ◽  
Specific Power ◽  
Supercapacitor Application ◽  
Long Cycle Life ◽  
Functionalized Carbon Nanotube

Functionalized carbon nanotube (FCNT) and Manganese Oxide (MnO2) nanoflower hybrid material was synthesized using hydrothermal technique as a promising electrode material for supercapacitor applications. The morphological investigation revealed the formation of ‘nanoflower’ like structure of MnO2 connected with FCNT, thus paving an easy path for the conduction of electrons during the electrochemical mechanism. A significant improvement in capacitance properties was observed in the hybrid material, in which carbon nanotube acts as a conducting cylindrical path, while the major role of MnO2 was to store the charge, acting as an electrolyte reservoir leading to an overall improved electrochemical performance. The full cell electrochemical analysis of FCNT-MnO2 hybrid using 3 M potassium hydroxide (KOH) electrolyte indicated a specific capacitance of 359.53 F g−1, specific energy of 49.93 Wh kg−1 and maximum specific power of 898.84 W kg−1 at 5 mV s−1. The results show promise for the future of supercapacitor development based on hybrid electrode materials, where high specific energy can be achieved along with high specific power and long cycle life.

scholarly journals Cyclic voltammetric study of tin hexacyanoferrate for aqueous battery applications

2016 ◽  
Vol 6 (3) ◽  
pp. 225 ◽  
Author(s):  
Denys Gromadskyi ◽  
Volodymyr Chervoniuk ◽  
Sviatoslav Kirillov
Keyword(s):  
Alkali Metal ◽  
Specific Energy ◽  
Metal Ion ◽  
Specific Capacity ◽  
Negative Electrode ◽  
Specific Power ◽  
Alkali Metal Ion ◽  
Cyclic Voltammetric Study ◽  
Aqueous Battery ◽  
Double Layer Capacitors

<p><span lang="EN-US">A hybrid composite containing 65 mass % of tin hexacyanoferrate mixed with 35 mass % of carbon nanotubes has been synthesized and its electrochemical behavior as a negative electrode in alkali metal-ion batteries has been studied in 1 mol L<sup>-1</sup> aqueous solution of sodium sulfate. The specific capacity of pure tin hexacyanoferrate is 58 mAh g<sup>-1</sup>, whereas the specific capacity normalized per total electrode mass of the composite studied reaches 34 mAh g<sup>-1</sup>. The estimated maximal specific power of an aqueous alkali-metal ion battery with a tin hexacyanoferrate electrode is ca. 3.6 kW kg<sup>-1</sup> being comparable to characteristics of industrial electric double-layer capacitors. The maximal specific energy accumulated by this battery may reach 25.6 Wh kg<sup>-1</sup> at least three times exceeding the specific energy for supercapacitors.</span></p>

Design of functional nanocomposites based on graphene and graphene-like materials, as well as organic conjugated polymers – promising electrode materials for supercapacitors and heterogeneous catalysts

2021 ◽  
pp. 11-25
Author(s):  
Yaroslav I. Kurys ◽  
◽  
Olha A. Kozarenko ◽  
Vyacheslav G. Koshechko ◽  
Vitaly D. Pokhodenko ◽  
...  
Keyword(s):  
Specific Energy ◽  
Heterogeneous Catalysts ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Ammonium Persulfate ◽  
Hydrogenation Reaction ◽  
Specific Power ◽  
Active Electrode ◽  
The Stability ◽  
Charge Discharge

The results obtained during the project on the development of promising functional nanocomposites based on graphene and graphene-like materials, as well as conducting polymers as active electrode materials for symmetric supercapacitors (SSC) and heterogeneous catalysts for quinoline hydrogenation are considered. Using a mechanochemical approach, nanocomposites based on polyaniline (PAni) and a number of 2D materials (nanostructured graphite – nG, molybdenum disulfide – nMoS2, tungsten disulfide – nWS2) were obtained. It was found that PAni/nG-based electrodes are able to provide the specific capacity of ~360 F/g in SSC and stability for at least 10,000 charge-discharge cycles. It is shown that PAni/nG-based SSC is able to operate at high current and the specific power of SSC can reach ~10 kW/kg at the specific energy of ~18 W∙h/kg. In the study of SSC based on nMoS2/PAni and nWS2/PAni, it was found that nanoparticles of d-metal sulfides to promote electrochemical reversibility of redox conversion in PAni at high potentials and contribute to the stability of nanocomposites during prolonged charge-discharge cycling. The specific capacity of such materials can reach 610 F/g and the specific power of SSC can reach ~4.1 kW/kg for specific energy ~23.5 W·h/kg. A number of Co-containing nanocomposites consisting of Co9S8 particles on Co,N,S-doped carbon was obtained by pyrolysis using various nanosized carbon materials and the monomer (5-aminoindole) - oxidant (ammonium persulfate) system. High catalytic activity of the obtained nanocomposites in the quinoline hydrogenation reaction was demonstrated – the yield of the target product (1,2,3,4-tetrahydroquinoline) is from ~85-90% to almost quantitative.

Sign in / Sign up

Export Citation Format

Share Document