Table 1.
Labels assigned to various NiO samples and preparation conditions.
| Label | Alkali | Calcination Temperature |
|---|---|---|
| A4 | (CH3CH2)3N | 400 °C |
| A6 | (CH3CH2)3N | 600 °C |
| U4 | (NH2)2CO | 400 °C |
| U6 | (NH2)2CO | 600 °C |
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