| [Pt] | Pt loading |
| a | lattice parameter |
| b | Tafel slope |
| C | bulk concentration of oxygen molecules |
| D | diffusion coefficient of oxygen |
| E r | reversible potential for the electrode |
| F | Faraday’s constant |
| I | test current |
| j | current density |
| j 0 | exchange current density for the ORR |
| j k | kinetic current density |
| l | number of layers and |
| m | parameters related to the mass transport limitation |
| n | parameters related to the mass overpotential |
| ne | number of exchanged electrons in the reaction |
| N S | number of surface atoms |
| N T | total number of atoms |
| Q H | charge exchanged |
| q H | charge required for the monolayer adsorption of H2 on Pt surfaces |
| R | total resistance |
| s | probe spacing |
| t | specimen thickness |
| V | measured voltage |
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