Cặp oxy hóa khử Zn²⁺/Zn có thế điện cực theo phương trình Nernst là:

εZn²⁺/Zn = ε⁰Zn²⁺/Zn – (RT/2F) lg[Zn²⁺]/[Zn]

εZn²⁺/Zn = ε⁰2H⁺/H₂ – (RT/F) lg[Zn²⁺]/[Zn]

εZn²⁺/Zn = ε⁰Zn²⁺/Zn + (RT/F) lg[Zn]/[Zn²⁺]

εZn²⁺/Zn = ε⁰Zn²⁺/Zn + (RT/2F) lg[Zn²⁺]/[Zn]