The present disclosure describes systems and methods to provide electrode cooling for material surface treatment systems. A cooling fluid is employed to cool electrodes with a high voltage applied. For example, a conduit conveys a cooling fluid through the electrode, as the conduit also provides electrification for the electrode by being connected to an electrical power source. Further, cooling is implemented by use of a voltage isolator disposed between the conduit and a reservoir, with the voltage isolator providing a pathway to a reference voltage for residual electric charge from the cooling fluid passing through the voltage isolator.