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Carbon and oxygen concentrations obtained by elemental analysis and provided by the supplier.
| Sample | Elemental analysis | Supplier data | ||
|---|---|---|---|---|
| C content (wt%) | O content (wt%) | C content (wt%) | O/H content (wt%) | |
| Graphite | 95.9 ± 1.8 | 0.6 ± 0.1 | 99.99 | −/− |
| Graphene oxide | 89.8 ± 3.1 | 5.5 ± 0.5 | 83.4 | 8.1/4.5 |
| ThCx–graphite | 19.1 ± 0.2 | 2.6 ± 0.2 | – | – |
| ThCx–GO | 19.7 ± 1.0 | 3.8 ± 0.7 | – | – |
