The invention describes a current generating cell device, which uses concentration gradients to create the electric flux. The cell is preferably defined by the use of a porous separator or bi-polar membrane to effect ion separation. In addition, an ion-exchange resin or other conductivity enhancement method may be present in one or both compartments to enhance the ion flow characteristics. In addition, the use of the ion-exchange resin or other conductivity enhancement method may also be used in combination with conventional two-membrane systems.