Table 3.
Summary of ORR performance.
| Catalyst | Onset Potential (Eonset; V vs. SHE)a | Peak Potential (Epeak; V vs. SHE)a | Current Density (mA/cm2)b | Electrolyte | pH | Refs. |
|---|---|---|---|---|---|---|
| PCN-222(Fe)@G-dye (50 wt%) | 0.157 (0.306) | −0.765 (1.23) | −6.2 | 0.1 M KOH | 13 | [188] |
| FeTCPP@G-dye (50 wt%) | 0.157 (0.306) | −0.765 (1.23) | −4.9 | |||
| PCN-222(Fe)@Graphene (50 wt%) | −0.065 (0.528) | −0.765 (1.23) | −3.8 | |||
| PCN-222(Fe) | −0.065 (0.528) | −0.765 (1.23) | −2.7 | |||
| PCN-222(Fe)@G-py (25 wt%) | 0.495 (0.735) | 0.317 (0.913) | −3.55 | 0.5 M H2SO4 | 0 | [189] |
| PCN-222(Fe)@G-py (50 wt%) | 0.495 (0.735) | 0.315 (0.915) | −4.9 | |||
| PCN-224(Co)/MWCNT | 0.375 (0.855) | 0.247 (0.983) | -d | 0.5 M H2SO4 | 0 | [182] |
| PCN-224(Co) | 0.370 (0.860) | 0.186 (1.044) | -d | |||
| PCN-223(Fe) | −0.5c,h | −1.1c | −0.7 | 0.1 M LiClO4 | – | [190] |
| PCN-223(Fe) | −0.32c,e | −1.1c | −1.2 | 0.1 M LiClO4+ 0.3 M CH3COOH | ||
| PCN-223(Fe) | −0.49c,f | −1.1c | −1.75 | 0.1 M LiClO4+ 0.3 M CCl3COOH | ||
| PCN-223-fbg | −0.63c,h | −1.1c | −0.25 | 0.1 M LiClO4 | ||
| PCN-223-fbg | −0.5c,h | −1.1c | −0.72 | 0.1 M LiClO4+ 0.3 M CH3COOH | ||
| PCN-223-fbg | −0.5c,h | −1.1c | −1 | 0.1 M LiClO4+ 0.3 M CCl3COOH | ||
| Pt/C | 1.0 (0.23) | 0.750 (0.580) | −6 | 0.1 M HClO4 | 1 | [191] |
a
Eonset is the potential at which catalytic activity begins; Epeak is the potential at which the catalytic wave reaches its highest current; Overpotentials (η) are given in parentheses.
b
The reported current density is at Epeak.
c
ORR was performed in DMF, therefore overpotentials are not given.
d
The electrode size was not reported.
e
Measurable current was observed as early as −0.25 V vs. SHE.
f
Measurable current was observed as early as 0 V vs. SHE.
g
free base (non-metalated) porphyrin.
h
Potential was estimated from CV trace.