Drawing inspiration from plants: A metal–air paper battery for wearable devices

https://techxplore.com/news/2024-04-metalair-paper-battery-wearable-devices.html

"paper-based magnesium–air battery based on plant respiration mechanism... photosynthesis analogous to battery charge/ discharge: magnesium substrate generating power from oxygen and water... bonded magnesium foil onto paper, adding cathode catalyst, gas diffusion layer to paper's other side... open circuit 1.8V, 1V current density 100 mA/cm-2, maximum output 103 milliwatts/cm-2... nontoxic: carbon cathodes, safe pigment electrocatalyst... wearable pulse oximeter and GPS sensors"