14571
The Ag @ Pt nanoparticles with thin dendritic Pt shells show superior CO - tolerance performance with a I ( f ) / I ( b ) value reaching 3 . 71 .
 Chemical: Ag; Chemical: Pt; Chemical: Pt; Chemical: CO
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: Ag; Chemical: Pt; Chemical: Pt; Chemical: CO