21484
The formation mechanism of hierarchical CMG / Nafion / RuO2 ( CMGNR ) microspheres , which is triggered by the cooperative interplay during the in situ synthesis of RuO2 nanoparticles ( NPs ) , was extensively investigated .
 Chemical: Nafion; Chemical: RuO2; Chemical: RuO2
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: Nafion; Chemical: RuO2; Chemical: RuO2