21665
Ultrahigh - efficiency photocatalysts based on mesoporous Pt - WO3 nanohybrids .
 Chemical: Pt; Chemical: WO3
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: Pt; Chemical: WO3