22175
The platinum to gold surface atomic ratio determined from cyclic voltammetry and copper under - potential deposition experiments reveal good agreement with the calculated values at low platinum concentration .
 Chemical: platinum; Chemical: copper; Chemical: platinum
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: platinum; Chemical: copper; Chemical: platinum