Question

When a conductor e.g. metal or carbon is immersed in a electrolyte, electric double layer will be formed at the interface of the solid electrode and electrolyte. The equilibrium potential is related to the double-layer formed at the interface. Under the certain circumstance, the double-layer on the interface can disappear, the potential at which no double-layer is called “point of zero charge”. Please explain how it happens. (hint: the double layer is formed due to the difference of free energy between the electrode material and electrolyte. How to stop electron flow?)

Answer 1