Fandi Meng, a Chinese industrial designer has designed a concept generator called the i-Green Bicycle Charging System which can be attached to a bicycle. The i-Green harvests kinetic energy from a moving bicycle and converts it to electricity for powering small portable gadgets.

This is not the first bike-powered charger on the market and the Energy Harvesting Journal has previously reported on the Nokia bike charger and the Copenhagen Wheel.
The i-Green device, however, appears to differ in that it includes a portable wind turbine mechanism which could harvest energy from wind at the same time as harvesting kinetic energy.

The i-Green can be attached to and used with any bicycle, but is still in the concept stage and no further details are available.
Images source: Fandi Meng
For more read : Energy Harvesting and Storage for Electronic Devices 2010-2020