Study of Electrochemical Cells with Intermediate Gate Electrodes
In principle, the gate electrode could be constructed in several ways. Here, we considered capacitor-like gate electrodes. One plate of the capacitor was grounded and an external potential bias was applied to the other plate. Simulations (see figure) indicated that when the bias potential increased, the cell's current substantially decreased. In the experiments, we grounded the cathode to prevent the biasing potential from floating. A reference electrode was attached to the un-grounded plate and we ascertained that the potential on the capacitor with respect to the reference electrode depended linearly on the bias. Experiments validated the simulations: we demonstrated that by applying a voltage bias to the capacitor-like gate electrode, we could linearly controlled the external circuit current, Icell. This is the first step towards controlling the current produced by a battery and in essence, the first step towards constructing self-powered ion transistors.