Nonsense, like that electricity from raindrops? Or a potentially useful source of power?
Here we show that thin-film devices made from nanometre-scale protein wires harvested from the microbe Geobacter sulfurreducens can generate continuous electric power in the ambient environment. The devices produce a sustained voltage of around 0.5 volts across a 7-micrometre-thick film, with a current density of around 17 microamperes per square centimetre. We find the driving force behind this energy generation to be a self-maintained moisture gradient that forms within the film when the film is exposed to the humidity that is naturally present in air. Connecting several devices linearly scales up the voltage and current to power electronics.
What’s 17 microamps at 0.5 volts when it’s at home? 8.5 microwatts is, umm ?? A million cm 2/8.5 to get one watt? 12 sq metres a watt?
I’ve got these numbers wrong, haven’t I?