Piezoelectric power generation in tires
The battery range of many electric vehicles is limited, meaning that such methods of transportation can only be used for short trips. However, in extended-range electric vehicles or plug-in hybrids, manufacturers include an internal combustion engine that uses conventional fuels to recharge batteries in motion and, hence, extend their range. 1 Although practical, this approach defies the purpose of having an electrical driveline: to reduce environmental impact through the use of renewable energy sources. The need remains for a cleaner power-generation technique that allows maximum range extension with minimal environmental consequences. Piezoelectric materials generate electrical energy when subjected to mechanical strain. Power-generation devices based on such materials have surfaced in recent years in the context of vibrational-energy harvesting. 2 However, their output has only been sufficient to power sensors...