O + e⁻ ⇌ R · n = 1 · Dₒ = Dᵣ
∂cₒ/∂t = D ∂²cₒ/∂x² ; cᵣ = C* − cₒ
cₒ(0,t) = C* / {1 + exp[−F(E−E⁰′)/(RT)]}
cₒ(L,t) = C* ; cₒ(x,0) = C*
i = −FA D (∂cₒ/∂x)₀
|iₚ| = 0.4463 FA C* √(FDν/RT)