Working Electrodes The working electrodes are of various geometries and materials, ranging from
small Hg drops to flat Pt disks. Mercury is useful because it displays a wide negative potential range
(because it is difficult to reduce hydrogen ion or water at the mercury surface), its surface is readily
regenerated by producing a new drop or film, and many metal ions can be reversibly reduced into it.
Other commonly used electrode materials are gold, platinum, and glassy carbon.