"All the world's a stage we pass through." - R. Ayana

Saturday, 3 April 2010

Batteries & Capacitors Made of Paper

Batteries & Capacitors Made of Paper
Nanotubes + ink + paper = instant supercapacitor battery

BY JANELLE WEAVER

Dip an ordinary piece of paper into ink infused with carbon nanotubes and silver nanowires, and it turns into a battery or supercapacitor. Crumple the piece of paper, and it still works. Stanford researcher Yi Cui sees many uses for this new way of storing electricity.


See post-doctoral students in the lab of Prof. Yi Cui, Materials Science and Engineering, light up a diode from a battery made from treated paper, similar to what you would find in a copy machine. The paper batteries are treated with a nanotube ink, baked and folded into electrical generating sources like the one wrapped in foil seen here.

Stanford scientists are harnessing nanotechnology to quickly produce ultra-lightweight, bendable batteries and supercapacitors in the form of everyday paper.
Simply coating a sheet of paper with ink made of carbon nanotubes and silver nanowires makes a highly conductive storage device, said Yi Cui, assistant professor of materials science and engineering.

"Society really needs a low-cost, high-performance energy storage device, such as batteries and simple supercapacitors," he said.
Like batteries, capacitors hold an electric charge, but for a shorter period of time. However, capacitors can store and discharge electricity much more rapidly than a battery.

Cui's work is reported in the paper "Highly Conductive Paper for Energy Storage Devices," published online in the Proceedings of the National Academy of Sciences.
"These nanomaterials are special," Cui said. "They're a one-dimensional structure with very small diameters." The small diameter helps the nanomaterial ink stick strongly to the fibrous paper, making the battery and supercapacitor very durable. The paper supercapacitor may last through 40,000 charge-discharge cycles – at least an order of magnitude more than lithium batteries. The nanomaterials also make ideal conductors because they move electricity along much more efficiently than ordinary conductors, Cui said.

Bing Hu, a post-doctoral fellow, prepares a small square of ordinary paper to with an ink that will deposit nanotubes on the surface that can then be charged with energy to create a battery.

Image: L.A. Cicero

Bing Hu, a post-doctoral fellow, prepares a small square of ordinary paper with an ink that will deposit nanotubes on the surface that can then be charged with energy to create a battery.

Cui had previously created nanomaterial energy storage devices using plastics. His new research shows that a paper battery is more durable because the ink adheres more strongly to paper (answering the question, "Paper or plastic?"). What's more, you can crumple or fold the paper battery, or even soak it in acidic or basic solutions, and the performance does not degrade. "We just haven't tested what happens when you burn it," he said.

The flexibility of paper allows for many clever applications. "If I want to paint my wall with a conducting energy storage device," Cui said, "I can use a brush." In his lab, he demonstrated the battery to a visitor by connecting it to an LED (light-emitting diode), which glowed brightly.

A paper supercapacitor may be especially useful for applications like electric or hybrid cars, which depend on the quick transfer of electricity. The paper supercapacitor's high surface-to-volume ratio gives it an advantage.

"This technology has potential to be commercialized within a short time," said Peidong Yang, professor of chemistry at the University of California-Berkeley. "I don't think it will be limited to just energy storage devices," he said. "This is potentially a very nice, low-cost, flexible electrode for any electrical device."

Cui predicts the biggest impact may be in large-scale storage of electricity on the distribution grid. Excess electricity generated at night, for example, could be saved for peak-use periods during the day. Wind farms and solar energy systems also may require storage.

"The most important part of this paper is how a simple thing in daily life – paper – can be used as a substrate to make functional conductive electrodes by a simple process," Yang said. "It's nanotechnology related to daily life, essentially."

Cui's research team includes postdoctoral scholars Liangbing Hu and JangWook Choi, and graduate student Yuan Yang.
Janelle Weaver is a science-writing intern at the Stanford News Service.



For further enlightenment enter a word or phrase into the search box @  New Illuminati:

or http://newilluminati.blog-city.com  (this one only works with Firefox)

And see

The Her(m)etic Hermit - http://hermetic.blog.com
 http://newilluminati.blog-city.com (this one only works with Firefox)


This material is published under Creative Commons Copyright (unless an individual item is declared otherwise by copyright holder) – reproduction for non-profit use is permitted & encouraged, if you give attribution to the work & author - and please include a (preferably active) link to the original along with this notice. Feel free to make non-commercial hard (printed) or software copies or mirror sites - you never know how long something will stay glued to the web – but remember attribution! If you like what you see, please send a tiny donation or leave a comment – and thanks for reading this far…

 http://newilluminati.blog-city.com (this one only works with Firefox)

1 comment:

  1. i am giving a testimony of how i become rich and famous today... i was deeply strangled up by poverty and i had no body to help me, and also i search for help from different corners but to no avail... i see people around me getting rich but to me i was so ashamed of my self so i met a man on my way he was very rich and he was a doctor so he told me something and i think over it though out the day so the next day i looked up and i keep repeating what he said to me. " if you want to get rich quick and be famous" you need to cross your heart and do what is in your mind so i tried all i could in other for me to do as he said so later on i told my fellow friend about this same thing then my friend was interested in my suggestions so i decided to look in the internet and i found an email address of this great fraternity(
    illuminatimembershipcentre@gmail.com) so we decided to contact them and unfortunately we did as they instruct us to do and later they told us to get some requirements and all the rest... so this initiation took us just a week and later on the great fraternity gave us $70,000,000.00 to start up our lives.... and now am testifying that if in any case you want to join any great fraternity all you need to do is for you to contact them because they are legitimate and they do as what they instructed them to do okay so email them now at ( illuminatimem,bershjipcentre@gmail.com.com ) or you can call them now +2348138140874 they will respond to you okay... regards!!.... or add them on whatsapp via there number +2348138140874

    ReplyDelete

Add your perspective to the conscious collective