Resumen de Battery-in-a-box backpack charges gadgets on the go
Smaller, lighter piezoelectric generators use ceramic crystal to convert pressure into voltage, but they are expensive and a lot less efficient. Now Zhong Lin Wang and colleagues at the Georgia Institute of Technology in Atlanta have captured the electricity generated from bringing two differently charged surfaces into contact, then separating them. This is called the triboelectric effect, the same process that causes static electricity shocks.
