Copper wires can have dual-use as batteries

6 June 2014
By Edd Gent
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Copper cabling could be used to store as well as transmit energy according to scientists

Copper cabling could be used to store as well as transmit energy according to scientists

Ordinary copper electrical wire could be used to both transmit and store energy simultaneously, according to researchers.

The breakthrough could lead to smaller electronics, more trunk space in a hybrid car and eventually clothing that can recharge a mobile phone, according to nanotechnology scientist Jayan Thomas from the University of Central Florida.

The scientists have discovered a way to store energy in a thin sheath around an ordinary lightweight copper electrical wire, effectively creating super capacitor, which can still transmit electricity.

"We can just convert those wires into batteries so there is no need of a separate battery," Thomas said. "It has applications everywhere."

The work will be the cover story in the June 30 issue of the material science journal Advanced Materials, and is the subject of an article in the current edition of science magazine Nature.
Thomas's PhD student Zenan Yu is co-author.

To create the modified wire, first Thomas heated the copper wire to create what he described as fuzzy "nano-whiskers," which are naturally insulated by copper oxide. The microscopic nano-whiskers vastly expand the wire's surface area that can store energy.

A second plastic-covered layer of nano-whiskers creates a second electrode, similar to the positive and negative sides of a standard battery, Thomas said.

The technique could be used to lighten airplanes and spacecraft, to store excess energy from solar panels, and to further miniaturize small electronics, he said.

The technique could also replace high energy-density supercapacitors, sometimes mistaken by hybrid car owners as a second battery, which provide the quick shot of energy that cars and heavy machinery need to start.

"You open your trunk and you see a lot of space is taken by your batteries. If you can just use some of the cables along the length of your car, you don't need any of that space for batteries," Thomas said.

He plans further research to apply the same technique to fibres woven into clothing along with a flexible solar cell, creating a wearable battery pack.

Thomas is a faculty member at the UCF Nanoscience Technology Center with joint appointments in the College of Optics and Photonics and the College of Engineering and Computer Science.

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