Electrode and electrochemical measurement system

An electrode comprising:

• a substrate, a metal underlying layer, and an electrically conductive carbon layer in order toward one side in a thickness direction, wherein
• a material for the metal underlying layer is an alloy containing a first metal and a second metal;
• the first metal has a first potential window obtained by using a first electrochemical measurement system including a first sample electrode including the substrate, the metal underlying layer made of the first metal, and the electrically conductive carbon layer, and first activity with respect to a ferricyanide compound obtained by using the first electrochemical measurement system;
• the second metal has a second potential window obtained by using a second electrochemical measurement system including a second sample electrode including the substrate, the metal underlying layer made of the second metal, and the electrically conductive carbon layer, and second activity with respect to the ferricyanide compound obtained by using the second electrochemical measurement system;
• the first metal and the second metal are different from each other;
• the second activity is equal to or greater than the first activity;
• and
• the first potential window is equal to or greater than the second potential window.