β and A from fitting i0 to Epeak using the expression , 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.
![]() | Ea (kJ/mol) | ΔEpeak (V) | βEa | |||
β | A | 0.1 M KOH | H2 pump (pH 0) (24) | |||
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 | — | — |