The present invention concerns a membrane-less electrolyzer comprising a fluidic channel for receiving an electrolyte fluid; a first electrode and a second electrode located inside the fluidic channel, the first and second electrode permitting to extract a first gas and a second gas inside the fluidic channel from the electrolyte fluid, the first electrode and second electrode being separated by solely a surrounding fluid in the fluidic channel or the electrolyte; and a first fluidic transport channel for transporting the first gas to a first outlet and a second fluidic transport channel for transporting the second gas to a second outlet.