Table 2. Electrocatalytic and Structural Data of Co3O4 Samples Presented in This Studya.
| sample | Tafel slope (mV dec–1) | η (V) | Δd⊥ (nm) | Δd|| (nm) | Δε⊥ (%) | Δε|| (%) |
|---|---|---|---|---|---|---|
| Co3O4/Ir(100) | 67 | 0.474 | 0 | 0.1 | 0.01 | 0.01 |
| Co3O4/CoOOH-1M | 56 | 0.411 | 0.3 | 0.2 | 0.15 | 0.01 |
| Co3O4/Au(111)-1M | 57 | 0.422 | 0.2 | 0.1 | 0.17 | 0.05 |
| Co3O4/Au(100)-2M | 64 | 0.396 | 0.3 | 0.9 | 0.43 | 0.24 |
| Co3O4/Au(111)-2M | 67 | 0.351 | 0.7 | 2.2 | 0.53 | 0.19 |
a
Given are the Tafel slope and the OER overpotential η for a current density of 1 mA cm–2, the changes in in-plane (Δd||) and out-of-plane (Δd⊥) grain size between 1.00 and 1.65 V, and the relative changes in-plane (Δε||) and out-of-plane (Δε⊥) strain over this potential range.