82245
The degradation of Platinum group metal-free ( PGM-free ) oxygen reduction reaction ( ORR ) catalyst in fuel cell cathodes follows the logistic decay function , suggesting an autocatalytic degradation mechanism .
 location: Platinum
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Platinum 
Answer:
 location: Platinum