8487
Prediction of ( TiO2 ) x ( Cu2O ) y alloys for efficient photoelectrochemical water splitting .
 Chemical: ( TiO2 ) x ( Cu2O ) y
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: ( TiO2 ) x ( Cu2O ) y