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| sample | Co | Fe | C | O |
|---|---|---|---|---|
| 75 wt % -RGO-CoFe1 (fresh) | 2.9 | 4.3 | 57.0 | 35.8 |
| 75 wt % -RGO-CoFe1 (used) | 3.0 | 7.0 | 52.0 | 38.0 |
| 13 wt % -RGO-CoFe3 (fresh) | 0.5 | 1.0 | 72.2 | 26.3 |
| 13 wt % -RGO-CoFe3 (used) | 0.8 | 1.4 | 61.4 | 36.4 |
