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Due to environmental problems, renewable energy is on the demand. However, one of the major challenges with many sources of renewable energy is that storing the energy produces is yet a problem to be solved. A research team in Finland have developed an interesting procedure that could help overcome this problem.

All the growth expectations regarding solar power have been surpassed during the past decade. In 2002, the globally installed photovoltaic (PV) capacity was 2 000 MW, and now, in 2015, we are expecting to exceed 200 000 MW. The capacity has more than doubled every two years, and does not show signs of slowing down. So what has really caused this rapid expansion and what does this mean for our future?

Music at a concert, the noise of traffic and even the sound of your own voice can be used to charge a smartphone. A prototype device uses an innovative nanogenerator to power up from sound.