13598
We observe a well - defined volcano curve which correlates the amount of Ag deposited on the surface with the current density at a fixed potential , with the peak activity around 2 / 3 ML Ag surface coverage .
 Chemical: Ag; Chemical: Ag
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: Ag