Abstract: Electrochemical cell system. The system includes a low Reynolds number microfluidic channel including spaced apart anode and cathode forming sides thereof. A fuel channel introduces a liquid fuel into the microfluidic channel for laminar flow along the anode and an oxidant channel introduces a concentrated liquid oxidant into the microfluidic channel for laminar flow along the cathode. An electrolyte channel introduces a liquid electrolyte into the microfluidic channel for laminar flow between the fuel and oxidant flows. Electrodes are connected to the anode and cathode for connection to an external load. In another embodiment, the anode is porous and a gaseous fuel such as hydrogen diffuses through the anode into the interior of the microfluidic channel.