Experimental parameters for the HER assessment of α-Co(OH)2, Ni-doped-Co(OH)2, and I & Ni co-doped-Co(OH)2.
| S. No. | Material | HER overpotential (mV) | Tafel slope (mV dec−1) | R ct (Ω) |
|---|---|---|---|---|
| 1 | α-Co(OH)2 | 337 | 170 | 6.8 |
| 2 | Ni–Co(OH)2 | 284 | 124 | 3.6 |
| 3 | I & Ni–Co(OH)2 | 229 | 110 | 2.4 |