Table 2. Fitted Rotational Barrier Wr and Diffusion Barrier Wx of Adsorbed Formic Acid for Different Computational Methodsa.
| PW91 | PBE | RPBE | PBE TS | PBE D3 | RPBE D3 | |
|---|---|---|---|---|---|---|
| Wr/meV | 25 | 23 | 12 | 21 | 28 | 33 |
| Wx/eV | 0.24 | 0.20 | 0.13 | 0.24 | 0.15 | 0.22 |
| De/eV | 0.40 | 0.47 | 0.43 | 0.77 | 0.86 | 0.84 |
For each method the resulting binding energy of formic acid is listed.