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Description of the analyzed samples with the percent of different elements in each sample.
| Sample | Description | C (%) | O (%) | Fe (%) |
| A | 2nd decorating approach with a ratio of (1 CNT/1 Fe salt); not calcined | 78.0 | 17.0 | 2.9 |
| B | 2nd decorating approach with a ratio of (1 CNT/1 Fe salt); calcined for 30 minutes | 86.0 | 11.0 | 2.5 |
| C | 2nd decorating approach with a ratio of (1 CNT/1.5 Fe salt); calcined for 30 minutes | 75.0 | 19.0 | 5.7 |
