Algae-powered computing: Scientists create reliable and renewable biological photovoltaic cell

This system, containing blue-green algae, powered a microprocessor continuously for a year using nothing but ambient light and water. Credit: Paolo Bombelli

Researchers have used a widespread species of blue-green algae to power a microprocessor continuously for a year—and counting—using nothing but ambient light and water. Their system has potential as a reliable and renewable way to power small devices.

The system, comparable in size to an AA battery, contains a type of non-toxic algae called Synechocystis that naturally harvests energy from the sun through photosynthesis. The tiny electrical current this generates then interacts with an aluminum electrode …
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