Table 1 Summary of β and A.

β and A from fitting i0 to Epeak using the expression Embedded Image, activation energy (Ea) measured using the RDE method in 0.1 M KOH from this work and an H2-pump configuration from the study of Durst et al. (24), difference in Hupd desorption peak potentials (ΔEpeak) in 0.1 M KOH and acid with pH 0, and βEa calculated as [Ea (0.1 M KOH) − Ea (H2 pump)]/FΔEpeak.

Embedded ImageEa (kJ/mol)ΔEpeak (V)βEa
βA0.1 M KOHH2 pump (pH 0) (24)
Pt/C0.55929.6 ± 0.416 ± 20.170.8
Ir/C0.86832.8 ± 0.419 ± 30.200.7
Pd/C0.63738.9 ± 3.031 ± 20.140.6
Rh/C0.63626.6 ± 0.728 ± 1