Impact Lab

Subscribe Now to Our Free Email Newsletter
March 12th, 2007 at 8:51 am

Pee Power: The Urine Powered Battery

Researchers at the Institute of Bioengineering and Nanotechnology created the credit card-size battery as a disposable power source for medical test kits.


Photo Sharing and Video Hosting at Photobucket

In 2005, Singapore scientist King Bang Lee and colleagues invented a battery powered by urine.

To make the battery, Lee and his colleagues soaked a piece of paper in a solution of copper chloride and sandwiched it between strips of magnesium and copper. This sandwich was then laminated between two sheets of transparent plastic.

When a drop of urine is added to the paper through a slit in the plastic, a chemical reaction takes place that produces electricity, Lee said.

The prototype battery produced about 1.5 volts, the same as a standard AA battery, and runs for about 90 minutes. Researchers said the power, voltage, and lifetime of the battery can be improved by adjusting the geometry and materials used.


You must be logged in to post a comment.

Should we gamify citizenship?