An electrode including a non-conductive substrate having a top surface and at least one channel extending therethrough, an electrically conductive trace material positioned adjacent a portion of the top surface of the non-conductive substrate and extending through the channel, and adapted for electrically coupling to a power source, and a second electrically conductive material that is inert or more corrosion resistant than the trace material. The second material is positioned adjacent to and entirely covering a top surface of the trace material. The electrode further includes a conductive hydrogel laterally offset from the trace material, the hydrogel may be positioned adjacent to a portion of a top surface of the second electrically conductive material.