Summary #694

Ultra-thin Layers of Rust Generate Electricity from Flowing Water
  • Graphene phenomenon - the electrokinetic effect - discovered in rust, as it can convert kinetic energy of saltwater into electricity, without any chemical reaction.
  • It would be difficult to fabricate graphene films, but it’s much easier to make layers of rust on iron, which would make it a valid method for generating electricity.
  • To form a consistently thin layer, researchers used physical vapor deposition to turn iron oxide into a vapor that condensed on the desired surfaces.
  • Various concentrations of salt water generated several tens of milivolts and several microamps per square cm.
  • 10 sq meters could generate enough power for a standard US home, but short-term less demanding uses are more likely, like low-power devices in remote locations.


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