A device for separating ions from a fluid stream is disclosed. The device includes a conduit eccentric and parallel to an axis of rotation. An inductor coil surrounds the conduit and forms a magnetic field parallel to the axis. The conduit has an inlet and three outlets. The outlets are arranged at different radial distances from the axis. The coil and the conduit are rotatable relative to one another about the axis. Fluid flows through the conduit to the outlets and the ions therein experience a force as they move perpendicular to the magnetic field. Ions of one polarity move toward the axis and exit the conduit from the innermost outlet. Ions of an opposite polarity move away from the axis and exit the conduit from the outermost outlet. Fluid substantially devoid of ions exits from the middle outlet. A method of generating gas from ion streams is disclosed.