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| Materials | Wt% | At% | ||
|---|---|---|---|---|
| C | Cu | C | Cu | |
| Cu/graphene composite coating (CuSO4 20 g L−1) | 5.16 | 94.84 | 22.35 | 77.65 |
| Cu/graphene composite coating (CuSO4 40 g L−1) | 6.32 | 93.68 | 26.31 | 73.69 |
| Cu/graphene composite coating (CuSO4 60 g L−1) | 6.99 | 93.01 | 28.46 | 71.54 |
