Catalyst

ORR: E(V) at I = −3 mA∙cm⁻²

OER: E(V) at I = 10 mA∙cm⁻²

Oxygen electrode activity (OEA)

(OER-ORR): E(V) vs RHE

Raw Coonut Shells

-0.21

1.92

2.13

N-doped Activated Carbon

0.74

1.77

1.03

Pt/C 20 wt% (Commercial)

0.83

2.01

1.18

Ru/C 20 wt% (Commercial)

0.47

1.59

1.12