Table 3. Summary of Average HER/HOR Results for Polycrystalline Pt and Commercial Pt/C Catalysts128.
| electrolyte | jo,intra (at 21 ± 1.5 °C) (mA/cmPt2) | jo,massa (at 21 ± 1.5°C) (mA/mgPt) | Eact (kJ/mol) | Tafel slopea (at 21 ± 1.5°C) (mV/dec) | |
|---|---|---|---|---|---|
| Pt (pc)b | 0.1 M KOH | 0.62 ± 0.01 | n.a.c | 28.9 ± 4.3 | 109 |
| Pt/Cd | 0.1 M KOH | 0.57 ± 0.07 | 0.35 ± 0.05 | 29.5 ± 4 | n.r.c |
a
Measured at 21 ± 1.5 °C.
b
Polycrystalline bulk metal Pt.
c
n.a. and n.r. stand for not applicable and not reported, respectively.
d
Commercial 46 wt % Pt/C (Tanaka Kikinzoku International, Inc.). Measured ECSA = 62 m2/gPt.