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| Precursor | Test system | Electrolyte | Current density (A g−1) | Specific capacitance (F g−1) | Ref. |
|---|---|---|---|---|---|
| Black locust (Robinia pseudoacacia) seed | 3 E | 6 M KOH | 1 | 333 | 35 |
| Moringa oleifera branches | 3 E | 6 M KOH | 0.5 | 374 | 36 |
| Agricultural wastes | 3 E | 6 M KOH | 1 | 225 | 37 |
| Cotton | 3 E | 6 M KOH | 1 | 278 | 20 |
| Mung bean husk | 3 E | 6 M KOH | 1 | 390 | 19 |
| Rape pollen | 3 E | 6 M KOH | 1 | 361.6 | 38 |
| Soybean shell | 3 E | 6 M KOH | 1 | 465 | This work |
