I'm curious to know is this concept can work.
Place two metallic plates in a body of salt water. Connect a power supply in order to attract ions close to each plate. Place two coils as illustrated around the plates. Create a water flow (could be sea waves or sea currents).
The ions will be dragged by the water flow and will generate a magnetic field which in turn should generate a current in the coils.
Could this concept be used to generate power?