Table 2.
Atomic contents of the mesoporous carbons, as obtained from XPS.
| MC-Fe-S1 | MC-Fe-S2 | MC-Fe-S3 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | 63.0% | C-C sp2 | 57.1% | C | 60.5% | C-C sp2 | 59.7% | C | 67.6% | C-C sp2 | 53.0% |
| C-C sp3 | 2.6% | C-C sp3 | <0.1% | C-C sp3 | 10.2% | ||||||
| C-O | 3.2% | C-O | 0.4% | C-O | 1.9% | ||||||
| C=O COOH O-C=O |
<0.1% | C=O COOH O-C=O |
0.4% | C=O COOH O-C=O |
2.5% | ||||||
| S | 4.4% | Fe-S | <0.1% | S | 6.1% | Fe-S | <0.1% | S | 5.9% | Fe-S | <0.1% |
| C-S | 2.6% | C-S | 4.1% | C-S | 4.0% | ||||||
| C-S-O C-S=O |
0.4% | C-S-O C-S=O |
0.1% | C-S-O C-S=O |
0.7% | ||||||
| -SOx | 1.4% | -SOx | 1.8% | -SOx | 1.2% | ||||||
| O | 24.1% | Fe-O | 5.2% | O | 24.4% | Fe-O | 5.8% | O | 18.7% | Fe-O | 5.3% |
| Other | 18.9% | Other | 18.6% | Other | 13.4% | ||||||
| Fe | 8.6% | Fe2O3 | ~5.2% | Fe | 9.0% | Fe2O3 | ~5.8% | Fe | 7.8% | Fe2O3 | ~5.3% |
| FeSO4 | ~1.4% | FeSO4 | ~1.8% | FeSO4 | ~1.2% | ||||||