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Graphene (Graphite Carbon Chicken wire) applications Solar, Fuel cells & Ultracapacitors

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This topic contains 2 replies, has 1 voice, and was last updated by  Charles Randall 11 years, 10 months ago.

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  • #3228

    Charles Randall
    Participant

    Graphene: Source of The Next Industrial Revolution?
     posted by Kit Eaton Dec 19, 2008
    “An atomically-thick layer of bonded carbon atoms in a hexagonal array, that can be made by peeling a layer off a graphite block with sticky-tape” doesn’t sound like a particularly wondrous material. But that’s an approximate description of graphene, which may one day fairly soon change the world.

    The material was first “discovered” in its form of isolated thin sheets in 2004 by a group of scientists at Manchester University and the Institute for Microelectronics Technology, in Chernogolovka, Russia. And since then a sequence of scientific discoveries has revealed quite how astonishing the material actually is.
    Just recently researchers at Rice University discovered a way of using a layer of graphene to store electronic data. Nothing new there, you might think: But the graphene memory may have the capacity to store data much more densely than NAND flash is predicted to, and be capable of withstanding 200C heat. This might make graphene-based memory an excellent candidate for long-term digital archiving–one current issue in the minds of electronic historians.
    Meanwhile, University of Maryland physicists have demonstrated that graphene can conduct electricity better than any other known material at room temperature. Electron transport in graphene occurs 100 times faster than in silicon. And though there are difficulties scaling this result up to to larger sizes, the material will likely find uses in chip-chip data transfer connections.

    A Manchester University team recently engineered the world’s smallest transistor out of graphene: Just one atom deep and ten wide. That scale blows current semiconducting transistors out of the water, and if it extends Moore’s law in the same way as has been historically possible, it suggests pocket-sized supercomputers may one day be possible, sipping less power and generating less waste heat than current machines do.
    But graphene doesn’t just have amazing electrical properties: Mechanical engineers at Columbia University tested the strength of graphene in a rig that tried to pierce a microscopic sample with a diamond probe. Their discovery suggests that graphene is the strongest material ever found. Though it’d be impossible to use it in this way, if the sample were scaled up to a few inches across it could support the mass of a car on a pinpoint without breaking. On this macroscopic scale, of course, such an atomically-perfect structure would be impossible to maintain, and defects and flaws would weaken the graphene. But it still has potential for incorporation into future super-strong composite materials.

    At the University of Crete, graphene is being engineered into a 3D structure with layers “welded” together with carbon nanotubes, with the intention of creating a next-gen hydrogen fuel tank. It’s been found that such a layered material meets the projected mass-storage criteria for holding onto dangerous hydrogen safely in future fuel-cell powered cars: above 6% H2 by mass. Current tech can only manage about 2%.
    All this data is coming from Universities for two reasons. First, graphene is incredibly new, and finding out how it behaves is a task for science. Secondly, the wonder material is very hard to manufacture at anything above microscopic scales. The exfoliating “sticky tape” solution suggested above was an early attempt at making graphene, but it could only produce thickish layers. Now much work is being done to prepare it in different ways: by epitaxial growth, or the reduction of silicon carbide, hydrazine or ethanol chemically to produce free-standing “sheets” of graphene.
    Presently it’s one of the most expensive materials produced on Earth, with a human-hair width sample costing around $1,000. But there’s no reason to believe the problems of large-scale production can’t be solved, and create corresponding price slashes.
    And with a plethora of diverse applications waiting for it, this carbon material may end up driving on the next industrial revolution. Much as coal drove the first one.
     
     
     

  • #6341

    Charles Randall
    Participant

    There exist the potential that new understandings of Graphite particles (Graphene) could power the next industrial revolution in much the same way that Coal powered the last one!
     
    Here are some amazing articles around Graphene (thin sheet scraped off Graphite block) that has amazing chemical & physical properties that has wide host of potential applications like:
    -Energy Storage by replacing TiO2 in Solar cells, or making & Capturing both H2 & Electricty in Fuel Cells;
    -or as Ultracapacitors where Crystals of 2 dimensional Graphene behave in different & potential more complex /
    better way than the 3 dimensional Silicon. Thus deposing Silicon from the Throne of Computer / Technology applications.
     
    I wonder if there isn’t an application for Graphtized Needle Coke in some of these applications since the two often overlap in the Electrode applications for lot same property applications? <Similar to COP’s CPreme* Coke technology application for graphite anode applications in Lithium Ion Batteries for electric cars / fuel cells> 

  • #6340

    Charles Randall
    Participant

    <Opps – I posted the earlier article Dec 2008 around Graphene (Source of Next Industrial Revolution) instead of this newer article = Energy Edge (Carbon Chicken Wire) Jan 2009  that I will now post – CRandall>
     
    Energy Edge: Carbon Chicken Wire
    January 5, 2009 7:00 PM ET
    All BusinessWeek news 
    To see what could be the future of the energy industry and many other industries simply draw a line with a pencil. Notice the smoothness with which the pencil glides over the paper. If you were to look really hard [or had an electron microscope handy] you could see that the markings made by pencil “lead,” which is really graphite, a form of pure carbon, are made from millions of sheets of carbon just one atom thick joined together in a chicken wire-type pattern and stacked on top of each other.
    These sheets are loosely bound together, separating easily, which gives the pencil tip its soft feel. While most of the graphite left on the paper will consist of flakes hundreds or thousands of layers thick, chances are some individual layers will detach as well. Those sheets are known as graphene, and some think they promise to create a revolution in the energy industry.
    Graphene has many unique and interesting characteristics. It is the thinnest and possibly the strongest material known to man, yet it is also remarkably flexible. It conducts electricity at room temperature better than any other material, allowing electric current to flow at rates approaching the speed of light. It has an enormous surface area per unit of mass, and with current prices quoted near $1 per square micron, graphene is probably the most expensive substance on earth.
    Research into graphene has exploded since 2004, when researchers at the University of Manchester developed a new process that isolated individual graphene sheets previously thought to be too unstable to exist at room temperature. In addition to potential applications in electronics and health care, graphene is being touted for its value as a key building block in new energy technologies including solar panels that can capture more sunlight, improved batteries, and possibly a solution to the vexing problem of storing hydrogen gas.
    “It’s taken off, really, in the past year or so,” said Peter Blake, technical director of Graphene Industries, a Manchester, UK-based company that fabricates tiny slivers of graphene for sale to academic and corporate researchers. “We are struggling to keep up with demand.”
    One of the potential applications for graphene is in the fabrication of transparent conducting films, currently made of indium tin oxide, which is expensive and difficult to use. The world market for transparent conducting films made of indium tin oxide is currently about $1 billion annually [which does not include application] according to Unidym, a subsidiary of Pasadena-based Arrowhead Research (ARWR), which makes carbon-based films and other materials for the electronics industry.
    Transparent conducting films are used to make touch screens, liquid crystal displays, flat panel televisions, and photovoltaic solar cells. With solar cells, the transparent conducting film is used to gather electricity produced by the photo-active layer of a “thin-film” cell and route it to the circuit. The high conductivity of graphene, together with the fact that carbon is one of the most abundant materials on Earth, and indium, one of the rarest, make graphene-based transparent conducting films a highly attractive market.
    Another photovoltaic application for graphene is with dye-sensitized solar cells. These cells, which work on the same principal as photosynthesis, use titanium dioxide [TiO2] the main ingredient in white paint to capture sunlight. Titanium dioxide is used because of its massive surface area, which helps absorb photons from the sun instead of reflecting them. [Titanium dioxide does not trap light well, however, so it is covered in a dye.] Graphene has an even larger surface area for its weight than titanium dioxide, and thus could provide a more powerful cell by trapping more photons. Among the makers of dye-sensitized solar cells are: Australias Dyesol (DYSOF) and Japan’s Sony (SNE).
    One company, Photovoltaic Solar Cells (PVSO) of Fort Pierce, Florida, attempted to make graphene for such an application, but wasnt able to secure enough funding to move beyond the research phase. “We used these sheets in the same way that TiO2 is used” in dye-sensitized solar cells, said Lawrence Curtin, the companys founder. “It was used as the scaffolding for the dye.” Curtin said he is trying to sell his interest in the company to move on to graphene-related projects.
    Energy storage is also a major potential market for graphene. The massive surface area of graphene means it has a large surface area-to-weight ratio, which makes it interesting for developers of electrical components known as supercapacitors or ultracapacitors, because the charge-bearing particles [electrons] can be stored between layers. Capacitors are used throughout electronics to hold small amounts of electricity needed in quick bursts, rather than the slower but steady stream supplied by a battery. While they dont hold as much charge as a battery, new capacitor designs are beginning to close that gap.
    Rechargeable batteries hold electricity by means of a chemical reaction that is reversed when charge is being received.
    Ultracapacitors, however, physically store charge-bearing particles in a porous material. Currently, activated carbon is used as the porous material since it has a relatively high surface area to weight ratio of 500 square meters per gram. Graphene, however, has a ratio of 2,630 square meters per gram, according to research published in August by a group at the University of Texas at Austin, which found that “ultracapacitors based on these materials could have the cost and performance that would dramatically accelerate their adoption in a wide range of energy storage applications.” Maxwell Technologies (MXWL) makes ultracapacitors.
    Other energy storage applications include using graphene instead of graphite as electrodes for the lithium-ion batteries many companies are developing for the new generation of plug-in hybrid electric vehicles due in showrooms in 2010. Graphene could also act as a type of sponge to hold hydrogen atoms if hydrogen fuels ever take off.
     BusinessWeek

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