In many articles, the exchange current (i₀) value for the volcano plot can be found from the Norskov's assumption. When I used their values, I couldn't achieve their results. The exchange current relation is given as i₀=-ek₀(1/1+exp(ΔG_H*/kT). I have taken ΔG value as their and for k₀ taken as 1 since no experimental values, k (Boltzmann constant) taken in terms of eV/K and T as 300K.