Membrane, cell, device and method for (reverse) electrodialysis

A cell for performing a reverse electrodialysis process with a laminar flow, the cell comprising:

• at least two membranes, wherein each membrane comprises a number of straight parallel channels arranged on at least a first side of the membrane, wherein each straight channel extends linearly from an inlet part at a first end of the membrane to an outlet part at a second end of the membrane which is opposite the first end, and wherein the channels are suitable for throughfeed of a fluid and are configured to direct fluid along a fluid flow direction extending from the first to the second end of the membrane and to provide a laminar flow of the fluid through the channels, wherein the fluid flow direction is parallel to each straight channel,
• wherein at least one membrane is an anion-exchanging membrane and at least one other membrane is a cation-exchanging membrane, wherein the at least one anion-exchanging membrane and the at least one cation-exchanging membrane are placed alternately, and lie against each other at an outer surface.