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 Deciphering the Structural, Textural, and Electrochemical Properties of Activated BN-Doped Spherical Carbons

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 446 ◽  
Author(s):  
Bridget Mutuma ◽  
Boitumelo Matsoso ◽  
Damilola Momodu ◽  
Kabir Oyedotun ◽  
Neil Coville ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Photoelectron Spectroscopy ◽  
Electrode Materials ◽  
Electrochemical Analysis ◽  
Activation Mechanism ◽  
Specific Power ◽  
Carbon Spheres ◽  
Cell Potential ◽  
Co Doping ◽  
Pyridinic N

In this study, the effect of K2CO3 activation on the structural, textural, and electrochemical properties of carbon spheres (CSs) and boron and nitrogen co-doped carbon spheres (BN-CSs) was evaluated. Activation of the CSs and BN-CSs by K2CO3 resulted in increased specific surface areas and ID/IG ratios. From the X-ray photoelectron spectroscopy (XPS) results, the BN-CSs comprised of 64% pyridinic-N, 24% pyrrolic-N and 7% graphitic-N whereas the activated BN-CSs had 19% pyridinic-N, 40% pyrrolic-N and 22% graphitic-N displaying the effect of activation on the type of N configurations in BN-CSs. A possible BN-co-doping and activation mechanism for the BN-CSs is proposed. Electrochemical analysis of the electrode materials revealed that BN doping, carbon morphology, structure, and porosity played a crucial role in enhancing the capacitive behavior of the CSs. As a proof of concept, a symmetric device comprising the activated BN-CSs displayed a specific power of 800 W kg−1 at a specific current of 1 A g−1 within an operating cell potential of 1.6 V in a 3 M KNO3 electrolyte. The study illustrated for the first time the role of K2CO3 activation in influencing the physical and surface properties of template-free activated BN-CSs as potential electrode materials for energy storage systems.

Capacitive behaviour of functionalized carbon nanotube/ZnO composites coated on a glassy carbon electrode

2015 ◽  
Vol 3 (30) ◽  
pp. 15650-15660 ◽  
Author(s):  
Jagruti S. Suroshe ◽  
Shivram S. Garje
Keyword(s):  
Carbon Nanotube ◽  
Glassy Carbon ◽  
Electrode Materials ◽  
Carbon Electrode ◽  
Single Source ◽  
Cycle Stability ◽  
Single Source Precursor ◽  
Functionalized Carbon Nanotube ◽  
Charge Discharge

Synthesis, characterization of functionalized carbon nanotube/ZnO composites by solvothermal decomposition of a single source precursor and their use as electrode materials for supercapacitors with good reversible charge/discharge ability and cycle stability.

scholarly journals Electrochemical Analysis of Architecturally Enhanced LiFe0.5Mn0.5PO4 Multiwalled Carbon Nanotube Composite

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Sabelo Sifuba ◽  
Shane Willenberg ◽  
Usisipho Feleni ◽  
Natasha Ross ◽  
Emmanuel Iwuoha
Keyword(s):  
Electron Transfer ◽  
Carbon Nanotube ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Electrochemical Analysis ◽  
Multiwalled Carbon Nanotube ◽  
Spectroscopic Techniques ◽  
Redox Potentials ◽  
Multiwalled Carbon ◽  
Iron Manganese

In this work, the effect of carbon on the electrochemical properties of multiwalled carbon nanotube (MWCNT) functionalized lithium iron manganese phosphate was studied. In an attempt to provide insight into the structural and electronic properties of optimized electrode materials, a systematic study based on a combination of structural and spectroscopic techniques was conducted. The phosphor-olivine LiFe0.5Mn0.5PO4 was synthesized via a simple microwave synthesis using LiFePO4 and LiMnPO4 as precursors. Cyclic voltammetry was used to evaluate the electrochemical parameters (electron transfer and ionic diffusivity) of the LiFe0.5Mn0.5PO4 redox couples. The redox potentials show two separate distinct redox peaks that correspond to Mn2+/Mn3+ (4.1 V vs Li/Li+) and Fe2+/Fe3+ (3.5 V vs Li/Li+) due to interaction arrangement of Fe-O-Mn in the olivine lattice. The electrochemical impedance spectroscopy (EIS) results showed LiFe0.5Mn0.5PO4-MWCNTs have high conductivity with reduced charge resistance. This result demonstrates that MWCNTs stimulate faster electron transfer and stability for the LiFe0.5Mn0.5PO4 framework, which demonstrates to be favorable as a host material for Li+ ions.

scholarly journals Ultrafine beta-FeOOH and Fe3O4 obtained by precipitation method: comparative study of electrical and electrochemical properties

2020 ◽  
Vol 21 (4) ◽  
pp. 680-688
Author(s):  
L.V. Mokhnatska ◽  
V.O. Kotsyubynsky ◽  
V.M. Boichuk ◽  
M.L. Mokhnatskyi ◽  
Kh.V. Bandura ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Specific Capacitance ◽  
Specific Energy ◽  
Electrode Material ◽  
Precipitation Method ◽  
Specific Electrical Conductivity ◽  
Specific Power ◽  
Ultrafine Powders ◽  
Scan Rate ◽  
Frequency Dependences

In this work, ultrafine powders of b-FeOOH and Fe3O4 have been obtained by the precipitation method. The values of the specific surface area for materials b-FeOOH and Fe3O4 are 101 and 135 m2/h. Frequency dependences of specific electrical conductivity have been obtained in the temperature range of 20-150 oC. It has been found that the materials show a superlinear dependence (SPL). In addition, the crossover energies from dc to JPL and from JPL to SPL have been calculated: Edc = 0.55eV, Ep1 = 0.51eB, Ep2 = 0.16eB and Edc = 0.22 eV, Ep1 = 0.21eB, Ep2 = 0.1 eB. Potentiodynamic studies have been performed at a scan rate from 1 mV/s to 50 mV/s. The b-FeOOH electrode material showed a specific capacitance value of 80 F/g at a scan rate of 1 mV/s, while the specific capacitance of the Fe3O4 material reached 32 F/g. Galvanostatic measurements have been done for discharge currents of 0.05 A/g, 0.1 A/g -  0.25 A/g. b-FeOOH sample is characterized by the maximum specific energy value of 8 W h/kg at the value of specific power equal to 20 W/kg, and Fe3O4 material is characterized by the maximum specific energy of about 3.5 W h/kg. 

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.

scholarly journals Electrochemical Analysis of Architecturally Enhanced Life0.5Mn0.5PO4 Multi-Walled Carbon Nanotube Composite

2021 ◽  
Vol 66 ◽  
pp. 1-11
Author(s):  
Sabelo Sifuba ◽  
Shane Willenberg ◽  
Usisipho Feleni ◽  
Natasha Ross ◽  
Emmanuel Iwuoha
Keyword(s):  
Electron Transfer ◽  
Carbon Nanotube ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Electrochemical Analysis ◽  
Spectroscopic Techniques ◽  
Redox Potentials ◽  
Manganese Phosphate ◽  
Multi Walled Carbon Nanotube ◽  
Iron Manganese

In this work, the effect of carbon on the electrochemical properties of multi-walled carbon nanotube (MWCNT) functionalized Lithium iron manganese phosphate was studied. In an attempt to provide insight into the structural and electronic properties of optimized electrode materials a systematic study based on a combination of structural and spectroscopic techniques. The phosphor-olivine LiFe0.5Mn0.5PO4, was synthesized via a simple microwave synthesis using LiFePO4 and LiMnPO4 as precursors. Cyclic voltammetry was used to evaluate the electrochemical parameters (electron transfer and ionic diffusivity) of the LiFe0.5Mn0.5PO4 redox couples. The redox potentials show two separate distinct redox peaks that correspond to Mn2+/Mn3+ (4.1 V vs Li/Li+) and Fe2+/Fe3+ (3.5 V vs Li/Li+) due to interaction arrangement of Fe-O-Mn in the olivine lattice. The electrochemical impedance spectroscopy (EIS) results showed LiFe0.5Mn0.5PO4-MWCNTs having high conductivity with reduced charge resistance. This result demonstrates that MWCNTs stimulates faster electron transfer and stability for the LiFe0.5Mn0.5PO4 framework, which demonstrates favorable as a host material for Li+ ions.

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.

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