Algae-based voltaic cell (photovoltaic-ish but not PV): https://www.cam.ac.uk/research/news/scientists-create-reliable-biological-photovoltaic-cell-using-algae
@steve "The tiny electrical current this generates then interacts with an aluminium electrode and is used to power a microprocessor."
I just saw another project very similar to this! It's very cool, but it's basically an aluminum-air battery with an algae electrolyte.
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