Table 3.
XPS results of the peak fits of the C1s and O1s regions.
| Temperature (°C) | Graphite (CP1) | C–OH (CP2) | C=O (CP3) | C–OOH (CP4) | CO32−, CO, CO2 (CP5) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| BE (eV) | M (%) | BE (eV) | M (%) | BE (eV) | M (%) | BE (eV) | M (%) | BE (eV) | M (%) | |
| 650 | 284.6 | 68.5 | 286.0 | 14.7 | 287.2 | 7.0 | 288.7 | 6.2 | 290.1 | 3.7 |
| 700 | 284.6 | 70.9 | 286.0 | 9.6 | 286.8 | 6.8 | 288.5 | 8.7 | 290.2 | 4.5 |
| 750 | 284.6 | 69.4 | 285.8 | 10.8 | 286.7 | 6.5 | 288.3 | 7.2 | 289.9 | 6.1 |
| 800 | 284.6 | 66.0 | 286.0 | 15.5 | 287.5 | 7.5 | 288.9 | 3.2 | 289.7 | 7.8 |
| 850 | 284.6 | 65.3 | 286.0 | 12.4 | 287.2 | 10.5 | 289.0 | 6.4 | 290.8 | 5.4 |