Overpotential for various electrode materials such as silver, aluminum, and gold, one of the least reactive chemical elements, varies.
It is one of the least reactive chemical elements and is solid under standard conditions. Activation overpotential for the evolution of hydrogen, oxygen and chlorine on various electrode materials at 25C Silver 0.59 V +0.61 V Aluminium 0.58 V Gold 0.12 V +0.96 V 
