Mad Of Electronics

Here u can find some useful tips and links related to troubleshooting electronic appliances


Posted by rajascientist Wednesday, July 8, 2009

Before you next flush the toilet, consider this: Scientists in Singapore have developed a battery powered by urine.
Researchers at the Institute of Bioengineering and Nanotechnology created the credit card-size battery as a disposable power source for medical test kits.
Urine Power
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.
Scientist have combined refuelling your car and relieving yourself by creating a new catalyst that can extract hydrogen from urine

The catalyst could not only fuel the hydrogen-powered cars of the future, but could also help clean up municipal wastewater, reported on Monday.

Gerardine Botte of Ohio University uses an electrolytic approach to produce hydrogen from urine — the most abundant waste on earth — at a fraction of the cost of producing hydrogen from water.

Urine’s major constituent is urea, which incorporates four hydrogen atoms per molecule — importantly, less tightly bonded than the hydrogen atoms in water molecules.
Botte uses electrolysis to break the molecule apart, developing an inexpensive nickel-based electrode to efficiently oxidise the urea.

To break the molecule down, a voltage of 0.37V needs to be applied across the cell, which is much less than the 1.23V needed to split water.

“During the electrochemical process the urea gets adsorbed on to the nickel electrode surface, which passes the electrons needed to break up the molecule,” Botte told Chemistry World journal.


Search This Blog


Share |