Heterostructured poly(3,6-dithien-2-yl-9H-carbazol-9-yl acetic acid)/TiO2 nanoparticles composite redox-active materials as both anode and cathode for high-performance symmetric supercapacitor applications

2014 ◽  
Vol 2 (18) ◽  
pp. 6512-6524 ◽  
Author(s):  
Deniz Yiğit ◽  
Mustafa Güllü ◽  
Tuğrul Yumak ◽  
Ali Sınağ
Keyword(s):  
Acetic Acid ◽  
High Performance ◽  
High Specific Capacitance ◽  
Cycling Performance ◽  
Specific Power ◽  
Composite Electrodes ◽  
Active Materials ◽  
Redox Active ◽  
Symmetric Supercapacitor ◽  
Supercapacitor Applications

Heterostructured composite electrodes exhibited high specific capacitance, specific power and specific energy, good cycling performance and excellent reversible capability.

Nanotubes Based Composites for Energy Storage in Supercapacitors

2006 ◽  
Vol 51 ◽  
pp. 145-155 ◽  
Author(s):  
Elzbieta Frackowiak
Keyword(s):  
Transition Metal Oxides ◽  
High Performance ◽  
Active Surface ◽  
Cycling Performance ◽  
Composite Electrodes ◽  
Active Materials ◽  
New Generation ◽  
Charge Propagation ◽  
Asymmetric Configuration ◽  
Electrodes For Supercapacitors

Composites based on nanotubes with such active materials as conducting polymers (e.g. polyaniline, polypyrrole), transition metal oxides (manganese oxide) and carbons enriched in heteroatoms (e.g. nitrogen) have been considered as electrodes for supercapacitors. The open mesopores network formed by the entanglement of nanotubes permits the ions to diffuse easily to the active surface of the composite components, hence, a good charge propagation and high values of capacitance (100-350 F/g) have been obtained. Since nanotubular materials are characterized by a high resiliency, the composite electrodes can easily adapt to the volumetric changes during charge/discharge, that drastically improves the cycling performance of supercapacitors. Additionally, it has been proved that combining materials with pseudocapacitance properties in an asymmetric configuration is a very promising direction for developing a new generation of high performance supercapacitors.

scholarly journals Facile fabrication of hierarchical porous carbon for a high-performance electrochemical capacitor

RSC Advances ◽  
2017 ◽  
Vol 7 (73) ◽  
pp. 46329-46335 ◽  
Author(s):  
Guixiang Du ◽  
Qiuxiao Bian ◽  
Jingbo Zhang ◽  
Xinhui Yang
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Rate Capability ◽  
Electrochemical Capacitor ◽  
High Specific Capacitance ◽  
Cycling Performance ◽  
Hierarchical Porous Carbon ◽  
Hierarchical Porous ◽  
Facile Fabrication ◽  
Rapid Pyrolysis

A facile and rapid pyrolysis method is developed for the synthesis of 3D hierarchical porous carbon, which exhibits a high specific capacitance, good rate capability and good cycling performance.

scholarly journals Improving the Performance of a Graphite Foil/Polyaniline Electrode Material by a Thin PEDOT:PSS Layer for Application in Flexible, High Power Supercapacitors

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5791
Author(s):  
Zuzanna Zarach ◽  
Konrad Trzciński ◽  
Marcin Łapiński ◽  
Anna Lisowska-Oleksiak ◽  
Mariusz Szkoda
Keyword(s):  
High Power ◽  
Electrode Material ◽  
Specific Capacity ◽  
Protective Layer ◽  
High Specific Capacitance ◽  
Specific Power ◽  
Potential Range ◽  
Graphite Foil ◽  
Practical Applications ◽  
Symmetric Supercapacitor

In this study, we present a novel strategy for enhancing polyaniline stability and thus obtaining an electrode material with practical application in supercapacitors. A promising (graphite foil/polyaniline/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) GF/PANI/PEDOT:PSS) electrode material was characterized and used in the construction of a symmetric supercapacitor that provides an outstanding high power density. For this purpose, the electropolymerization of PANI was carried out on a graphite foil and then a thin protective layer of PEDOT:PSS was deposited. The presence of the nanometer PEDOT:PSS layer made it possible to widen the electroactivity potential range of the electrode material. Moreover, the synergy between materials positively affected the amount of accumulated charge, and thus the thin PEDOT:PSS layer contributed to enhancing the specific capacity of the electrode material. The electrochemical performance of the GF/PANI/PEDOT:PSS electrode, as well as the symmetrical supercapacitor, was investigated by cyclic voltammetry and galvanostatic charge/discharge cycles in 1 M H2SO4 at room temperature. The fabricated electrode material shows a high specific capacitance (Csp) of 557.4 Fg−1 and areal capacitance (Careal) of 2600 mF·cm−2 in 1 M H2SO4 at a current density of 200 mA·cm−2 (~4 A·g−1). The supercapacitor performance was studied and the results show that a thin PEDOT:PSS layer enables cycling stability improvement of the device from 54% to 67% after 10,000 cycles, and provides a high specific capacity (159.8 F·g−1) and a maximum specific power (18,043 W·kg−1) for practical applications.

Facile Preparation of NiO/Ni Nanocomposite and its Electrochemical Capacitive Behaviors

2011 ◽  
Vol 306-307 ◽  
pp. 134-138 ◽  
Author(s):  
Wei Dong Yin ◽  
Gui Lian Li ◽  
Xian Ming Liu
Keyword(s):  
Specific Capacitance ◽  
Oxidation Process ◽  
Aqueous Electrolyte ◽  
High Specific Capacitance ◽  
Cycling Performance ◽  
Charge Transfer Resistance ◽  
Electrochemical Performances ◽  
Composite Electrodes ◽  
Galvanostatic Charge ◽  
Transfer Resistance

NiO/Ni nanocomposites were prepared by chemically reduction-oxidation process in tetra-ethylene glycol (TEG) solution. The structure and morphology of the samples were examined by XRD and SEM. The results indicated the composite consisted of NiO and Ni and exhibited spherical morphology with diameter of 50-200 nm. The electrochemical performances of composite electrodes used in electrochemical capacitors were studied. The electrochemical measurements were carried out using cyclic voltammetry, galvanostatic charge/discharge and impedance spectroscopy in 6M KOH aqueous electrolyte using three-electrode Swagelok systems. The results showed that the composite had a high specific capacitance and excellent capacitive behavior. The specific capacitance of the composite decreased to 192F/g after 500 cycles. Due to the existance of Ni, the charge transfer resistance is lower than 1Ω. It revealed that the composite exhibited good cycling performance.

scholarly journals Composite Aerogels of Carbon Nanocellulose Fibers and Mixed-Valent Manganese Oxides as Renewable Supercapacitor Electrodes

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 129 ◽  
Author(s):  
Xiaoyu Guo ◽  
Qi Zhang ◽  
Qing Li ◽  
Haipeng Yu ◽  
Yixing Liu
Keyword(s):  
Manganese Oxides ◽  
Electrochemical Kinetics ◽  
Manganese Acetate ◽  
Carbon Substrate ◽  
Composite Electrodes ◽  
Freeze Dried ◽  
Symmetric Supercapacitor ◽  
Composite Aerogels ◽  
Hybrid Aerogels ◽  
Supercapacitor Applications

Bio-waste derived nanocelluloses show excellent mechanical flexibility and self-aggregated capability, which enable them to be good supporting substrates for the synthesis of electroactive materials. Herein, we present a facile route for fabricating composite aerogels consisting of carbonized nanocellulose fibers (CNF) and mixed-valent manganese oxide (MnOx), toward supercapacitor applications. Mixed solutions of nanocellulose and manganese acetate with different ratios were prepared and freeze-dried into hybrid aerogels. The hybrid aerogels were then transformed into CNF/MnOx composites by a calcination process. The CNF membranes served as porous carbon nano-reservoirs for MnOx and electrolyte. The CNF/MnOx composites also kept a 3D porous aerogel structure with hierarchical pores, which enabled stable transport of both electrolyte ions and electrons to the electrode surface, leading to low a charge-transfer impedance and good electrochemical kinetics. The CNF/MnOx-based symmetric supercapacitor showed a satisfied energy density and power density of 37.5 Wh kg−1 and 2.75 kW kg−1, respectively. All the above results demonstrate the feasibility of using sustainable nanocellulose as a nanoscale carbon substrate for the synthesis of hybrid composite electrodes toward renewable supercapacitor applications.

Nanostructured Metal Oxide and Composite Electrodes for Use in Ultracapacitors

2008 ◽  
Vol 1113 ◽  
Author(s):  
Michael T. Brumbach ◽  
Todd M. Alam ◽  
Paul G. Kotula ◽  
Bonnie B. McKenzie ◽  
Bruce C. Bunker
Keyword(s):  
Ruthenium Oxide ◽  
Materials Characterization ◽  
Organic Template ◽  
Composite Electrodes ◽  
Active Materials ◽  
Redox Active ◽  
Transport Barriers ◽  
Electrode Contact ◽  
Power And Energy ◽  
Nanostructured Metal

ABSTRACTMaximizing power and energy densities of ultracapacitors requires configuring redox-active materials in specific architectures that: 1) maximize electrolyte-electrode contact area, 2) minimize transport distances for both electrons and charge compensating species, and 3) minimize transport barriers. We have developed a simple solution-based method, using an organic template, that enables us to introduce hierarchical porosity in ruthenium oxide down to the nano-scale by controlling the oxidative crystal growth of RuO2. The high capacitances of the resulting nanostructured electrodes were found to be comparable to hydrous ruthenium oxide formed under dramatically different conditions. Materials characterization reveals that the organic template directs structure formation and promotes hydroxyl retention.

Carbon-modified Na2Ti3O7·2H2O nanobelts as redox active materials for high-performance supercapacitor

Nano Energy ◽  
2016 ◽  
Vol 28 ◽  
pp. 115-123 ◽  
Author(s):  
Chuanshen Wang ◽  
Yi Xi ◽  
Mingjun Wang ◽  
Chengshuang Zhang ◽  
Xue Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Active Materials ◽  
Redox Active

scholarly journals Development of Novel and Ultra-High-Performance Supercapacitor Based on a Four Layered Unique Structure

Electronics ◽  
2018 ◽  
Vol 7 (7) ◽  
pp. 121 ◽  
Author(s):  
Himanshu ◽  
S. Rao ◽  
Dinah Punnoose ◽  
P. Sathishkumar ◽  
Chandu Gopi ◽  
...  
Keyword(s):  
High Performance ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Ni Foam ◽  
Storage Devices ◽  
Capacitive Properties ◽  
Wrinkled Surface ◽  
Shell Geometry ◽  
Supercapacitor Applications

This paper presents an electrode with a core/shell geometry and a unique four-layered porous wrinkled surface for pseudocapacitive supercapacitor applications. To design the electrode, Ni foam was used as a substrate, where the harmonious features of four constituents, ZnO (Z), NiS (N), PEDOT:PSS (P), and MnO2 (M) improved the supercapacitor electrochemical performance by mitigating the drawbacks of each other component. Cyclic voltammetry and galvanostatic charge discharge measurements confirmed that the ZNPM hybrid electrode exhibited excellent capacitive properties in 2 M KOH compared to the ZNP, ZN, and solely Z electrodes. The ZNPM electrode showed superior electrochemical capacitive performance and improved electrical conductivity with a high specific capacitance of 2072.52 F g−1 at 5 mA, and a high energy density of 31 Wh kg−1 at a power density of 107 W kg−1. Overall, ZNPM is a promising combination electrode material that can be used in supercapacitors and other electrochemical energy conversion/storage devices.

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