‘Activated’ graphite oxide boosts supercapacitors

New form of carbon could aid energy storage
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Gas sensing and Electrical Properties of Metal oxide Nanostructures: Nanostructures, Synthesis, sensors, sensing mechanism, LEDs, FETs, Carbon nanotubes, graphene, Supercapacitors

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In the last few years, a little word has attracted enormous attention, and investigation from all over the world. The word is ?nano?. What it presents in terms of science and technology, which are also called nanoscience and nanotechnology, is much more than just a word describing a specific length scale. It has dramatically changed every aspect of the way we think in science and technology and will certainly bring more and more surprises into our daily life as well as into the world of the future. This thesis consists of four parts of which Part-1 gives a brief overview of the synthesis, properties and applications of nanomaterials. Part-2 deals with the synthesis and characterization of different nanostructures of metal oxides and a detailed study of their gas sensing characteristics. Part-3 of the thesis contains results of studies on the electrical properties and hydrogen-sensing characteristics of field effect transistors (FETs) based on nanorods of ZnO and WO2.72. Part-4 of the thesis deals with the supercapacitive behavior of RuO2 and IrO2 functionalized mesoporous carbon and results of studies on the interaction of SWNTs with electron donor and acceptor molecules.

BUY FROM AMAZON–>> Gas sensing and Electrical Properties of Metal oxide Nanostructures: Nanostructures, Synthesis, sensors, sensing mechanism, LEDs, FETs, Carbon nanotubes, graphene, Supercapacitors

New Carbon Based Materials for Electrochemical Energy Storage Systems: Batteries, Supercapacitors and Fuel Cells

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For the first time Argonne National Laboratory opened it doors in the USA to host researchers from both European and former Warsaw Pact countries to address the latest research on the development, synthesis, characterization and use of advanced carbonaceous materials for electrochemical energy storage systems. This meeting was attended by key scientists from both western and post-socialist universities and companies with a goal to open channels for future collaboration.

The energy storage systems covered during the meeting included: metal air primary and rechargeable batteries, supercapacitors, fuel cells and lithium-ion batteries. The latest developments on the manufacture of graphites, carbons, and nano-materials and their outlook for use in power sources were also presented .

The use of stable conducting polymers and expanded graphite in the cathode of zinc-air batteries was introduced. The role that new forms of carbons play in aqueous asymmetric capacitors was highlighted. The enhancement of cathode performance through the optimization of the carbon in the positive electrode and the use of metal-carbon composites as active materials in lithium-ion batteries were discussed. Also reviewed were recent developments in the use of hard carbons and surface treated graphites as electrode materials. Updates were also provided on the use of lithium-ion batteries for hybrid electric vehicles and power tools.

BUY FROM AMAZON–>> New Carbon Based Materials for Electrochemical Energy Storage Systems: Batteries, Supercapacitors and Fuel Cells

Carbon Nanotube and Polypyrrole Supercapacitors: Capacitance, Energy and Power

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Electrochemical capacitors also called supercapacitors are electrical energy storage devices filling the performance gap of conventional capacitors and batteries. They can store energy electrostatically at the electrode/electrolyte interface (double layer capacitance) and/or via Faradaic charge storage through reversible successive redox processes (pseudocapacitance). As such they achieve higher energy densities compared to dielectric capacitors while delivering significantly higher power than batteries. The amount of ion accessible surface area of the electrode material and the amount of time required for electronic charges and ionic charges to reach the electrode/electrolyte interface are the performance determining factors. Here the performance of carbon nanotubes and polypyrrole as electrode materials along with various organic electrolytes are explored.

BUY FROM AMAZON–>> Carbon Nanotube and Polypyrrole Supercapacitors: Capacitance, Energy and Power

Paper Battery Said To Outperform Lithium Ion

A paper battery based on carbon nanotubes and silver nanowires could store an electric charge in a mobile device. Researchers also claim the new battery is disposable and that its shape could conform to the shape of different devices.

A Stanford University researcher said his team has demonstrated conductive coatings for battery components ranging from supercapacitors to inexpensive electrodes. The process could be commercially available in several years, according to Yi Cui, a Stanford assistant professor of materials science and engineering.

“Paper can now be used as a substrate to make functional conductive electrodes,” the Stanford researcher said.

The conductive paper was prepared by coating it with a special nano-ink solution containing carbon nanotubes and silver nanowires, which assemble into a thin film of one-dimensional structures that adhere to the fibrous paper surface. The coated sheet of paper became a highly conductive storage device, which the researchers charged, then connected to power light-emitting diodes.

Batteries can store a charge longer than capacitors but cannot supply as much current per unit of time. Stanford’s conductive paper could be used to build either type, but the researchers claim that its high conductivity and high surface-to-volume ratio could enable supercapacitors for electric cars, which depend on quick jolts of electricity during acceleration.

The researchers also predict that paper storage devices could be used in massive arrays to store excess energy from power grids at night, then redistribute it during the day.

In tests, the Standford researchers were able to charge and discharge the paper battery up to 40,000 times, a 10-fold increase over conventional lithium-ion batteries.

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