14521
At a rate of 0 . 1 C , the cycling discharge capacity of the optimal composite is more than 2 . 3 times of that of unmodified mesoporous CuO nanosheets as the active material in an anode after 40 cycles .
 Chemical: CuO
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: CuO