Table 1 Summary of β and A.

β and A from fitting i₀ to E_peak using the expression , activation energy (E_a) 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 H_upd desorption peak potentials (ΔE_peak) in 0.1 M KOH and acid with pH 0, and β_Ea calculated as [E_a (0.1 M KOH) − E_a (H₂ pump)]/FΔE_peak.

			E_a (kJ/mol)		ΔE_peak (V)	β_Ea
	β	A	0.1 M KOH	H₂ pump (pH 0) (24)	ΔE_peak (V)	β_Ea
Pt/C	0.5	59	29.6 ± 0.4	16 ± 2	0.17	0.8
Ir/C	0.8	68	32.8 ± 0.4	19 ± 3	0.20	0.7
Pd/C	0.6	37	38.9 ± 3.0	31 ± 2	0.14	0.6
Rh/C	0.6	36	26.6 ± 0.7	28 ± 1	—	—