Table 5. Electrochemical Parameters for the Catalysts Prepared by Solvothermal Reductiona.
| sample | ECSA1 (cmNi2 cmgeom) | ECSA2 (mNi2 gNi) (% of STEM) |
i at 0.05 V (mA  ) |
i at 0.05 V (A ) |
i at 0.05 V (A  ) |
i0 (μA  ) |
|---|---|---|---|---|---|---|
| Ni/C | 10.38 | 2.77 (3.3) | 0.4 ± 0.1 | 0.4 ± 0.1 | 0.8 ± 0.2 | 40 ± 2 |
| Ni3Co/C | 24.48 | 5.13 (16.1) | 0.6 ± 0.1 | 0.5 ± 0.1 | 1.3 ± 0.3 | 19.0 ± 0.6 |
| Ni3Cu/C | 10.62 | 2.47 (6.4) | 0.5 ± 0.1 | 0.3 ± 0.1 | 0.9 ± 0.3 | 42 ± 3 |
| Ni3Fe/C | 5.07 | 1.61 (3.2) | 0.2 ± 0.01 | 0.154 ± 0.005 | 0.4 ± 0.1 | 7 ± 2 |
a
For an explanation of the terms in the column headings, see the footnotes in Table 4. Due to an effect of electrode rotation, the current densities at 0.05 V are given for one sample only, i.e., samples 5, 4, 3, and 2 for Ni/C, Ni3Co/C, Ni3Cu/C, and Ni3Fe/C, respectively, rather than for the other samples. See the Supporting Information for details.