Most energy generation systems consist of two components: a generator and a battery. Georgia Tech researcher Zhong Lin Wang thinks this is one too many. Along with his team, Wang has developed pocket-calculator-battery-sized fuel cells that is "self-charging." In other words, the device is both the generator and the battery all at once. At the heart of this tiny devices is a piezoelectric membrane which converts mechanical energy into chemical potential energy. The membrane does...
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