cobalt hydrate

例句：

1. 1. The new battery uses cobalt oxide as the active material.
   这种新电池使用氧化钴作为活性材料。
2. 2. Cobalt oxide is a common component in many types of catalysts.
   钴氧化物是许多类型催化剂的常见成分。
3. 3. The research team found that cobalt oxide could be used to improve the performance of solar cells.
   研究小组发现，钴氧化物可以用于提高太阳能电池的性能。