Microwave synthesis of graphene/magnetite composite electrode material for symmetric supercapacitor with superior rate performance

RSC Advances ◽  
2012 ◽  
Vol 2 (32) ◽  
pp. 12322-12328 ◽  
Author(s):  
Kaliyappan Karthikeyan ◽  
Dharmalingam Kalpana ◽  
Samuthirapandian Amaresh ◽  
Yun Sung Lee
Keyword(s):  
Microwave Irradiation ◽  
Electrode Material ◽  
Microwave Synthesis ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Low Cost ◽  
Rate Performance ◽  
Microwave Irradiation Method ◽  
Symmetric Supercapacitor ◽  
Supercapacitor Applications

Pristine Fe3O4 and Fe3O4–graphene composites were synthesized by using a green and low cost urea assisted microwave irradiation method and utilized as electrode materials for symmetric supercapacitor applications.

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.

Remarkable capacitive behavior of a Co3O4–polyindole composite as electrode material for supercapacitor applications

2015 ◽  
Vol 3 (48) ◽  
pp. 24338-24348 ◽  
Author(s):  
R. Pavul Raj ◽  
P. Ragupathy ◽  
S. Mohan
Keyword(s):  
Synergistic Effect ◽  
Specific Capacitance ◽  
Electrode Material ◽  
Composite Electrode ◽  
High Specific Capacitance ◽  
Single Step ◽  
Rate Performance ◽  
Capacitive Behavior ◽  
Supercapacitor Applications

A single step synthesized Co3O4–polyindole composite electrode exhibits high specific capacitance, rate performance and cyclability. This enhanced electrochemical supercapacitive behavior is mainly attributed to the synergistic effect between Co3O4 and polyindole.

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.

Microwave synthesis of high rate nanostructured LiMnBO3 with excellent cyclic behavior for lithium ion batteries

RSC Advances ◽  
2014 ◽  
Vol 4 (60) ◽  
pp. 31851-31854 ◽  
Author(s):  
Kaliyappan Karthikeyan ◽  
Yun Sung Lee
Keyword(s):  
Microwave Irradiation ◽  
Lithium Ion Batteries ◽  
Microwave Synthesis ◽  
Lithium Ion ◽  
High Rate ◽  
Cyclic Behavior ◽  
Microwave Irradiation Method

LiMnBO3 nanobeads (LMB-NB) prepared using a urea assisted microwave irradiation method delivered 67 mA h g−1 capacity at 0.6 C rate between 1.25 and 4.8 V, showing 88% cyclability after 100 cycles.

Porous diatomite-mixed 1,4,5,8-NTCDA nanowires as high-performance electrode materials for lithium-ion batteries

Nanoscale ◽  
2019 ◽  
Vol 11 (34) ◽  
pp. 15881-15891 ◽  
Author(s):  
Yong Xu ◽  
Jun Chen ◽  
Ze'en Xiao ◽  
Caixia Ou ◽  
Weixia Lv ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Lithium Ion ◽  
Rate Performance ◽  
Transfer Impedance ◽  
Lower Charge

A novel porous diatomite composite electrode composed of NTCDA nanowires exhibits lower charge transfer impedance, higher capacity and better rate performance.

Core–Shell Structured NiCo2O4@ZnCo2O4 Nanomaterials with High Energy Density for Hybrid Capacitors

2021 ◽  
Vol 16 (7) ◽  
pp. 1134-1142
Author(s):  
Wenduo Yang ◽  
Jun Xiang ◽  
Sroeurb Loy ◽  
Nan Bu ◽  
Duo Cui ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrode Material ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Structural Characteristics ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Shell Composite ◽  
Hybrid Capacitors

NiCo2O4 as an electrode material for supercapacitors (SCs) has been studied by a host of researchers due to its unique structural characteristics and high capacitance. However, its performance has not yet reached the level of practical applications.it is an effective strategy to synthesize composite electrode materials for tackling the problem. Herein, NiCo2O4@ZnCo2O4 as a novel core–shell composite electrode material has been fabricated through a two-step simple hydrothermal method. The as-prepared sample can be directly used as cathode material of a supercapacitor, and its specific capacitance is 463.1 C/g at 1 A/g. An assembled capacitor has an energy density of 77 Wh·kg−1 at 2700 W·kg−1, and after 8000 cycles, 88% of the initial capacity remains.

Improved Piezoelectric Performance of Electrospun PVDF Nanofibers with Conductive Paint Coated Electrode

2019 ◽  
Vol 19 (02) ◽  
pp. 1950008 ◽  
Author(s):  
R. Tamil Selvan ◽  
W. A. D. M. Jayathilaka ◽  
A. Hilaal ◽  
S. Ramakrishna
Keyword(s):  
Contact Area ◽  
Electrode Material ◽  
Polyvinylidene Fluoride ◽  
Electrode Materials ◽  
Low Cost ◽  
Short Circuit ◽  
Open Circuit ◽  
Energy Output ◽  
Piezoelectric Performance ◽  
Conductive Paint

Fabrication of Nanogenerators (NGs) using Electrospun polyvinylidene fluoride (PVDF) nanofibers for sensing and energy harvesting applications is a trending research due to its flexibility, biocompatibility, low-cost, etc. Different electrode materials, polymer composites had been proposed to increase the energy output. However, the contact area between the electrode material and nanofiber mat which helps to conduct more piezoelectric charges to the electrode surface are still unexplored especially at nanoscale level. In this paper, authors have proposed the use of low-cost carbon conductive paint to increase the contact area between the electrode and nanofiber mat. The electrode material is coated with conductive paint and the NG was fabricated with that electrode to compare the performances with conventional NG. Piezoelectric performance of the proposed NG has increased substantially as it generates an open circuit voltage [Formula: see text]) of 4.5[Formula: see text]V and short circuit current [Formula: see text]) of 25[Formula: see text]nA, whereas the conventional NG can only produce 1.6 [Formula: see text]) and 1.5[Formula: see text]nA [Formula: see text]). A drop test experiment was conducted, and the device consistency was verified experimentally.

Microwave synthesis of new biologically important 1,4-dihydropyridines containing benzothiazole moiety

2010 ◽  
Vol 75 (3) ◽  
pp. 275-287 ◽  
Author(s):  
Mithlesh ◽  
Pawan K. Pareek ◽  
Hemraj Chippa ◽  
Ravikant ◽  
Krishan G. Ojha
Keyword(s):  
Microwave Irradiation ◽  
Aromatic Aldehyde ◽  
Microwave Synthesis ◽  
Solid Support ◽  
Solvent Free ◽  
Microwave Irradiation Method ◽  
Antifungal Activities ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal ◽  
Active Methylene

2,3,5,6-Tetrasubstituted-4-aryl-1-(6-ethoxybenzothiazol-2-yl)-1,4-dihydropyridines were synthesized by the reaction of 2-amino-6-ethoxybenzothiazole, an aromatic aldehyde and an active methylene compound in methanol by conventional or microwave irradiation method (solvent-free or with solid support). All compounds were tested for antibacterial and antifungal activities and the results were compared with standard drugs. Their acaricidal and antifeedant activities were also tested.

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