28521
With an ordered polystyrene ( PS ) template - assisted electrochemical approach we synthesized three - dimensional ordered macroporous ( 3DOM ) Cu2O / Ni inverse opals as electrodes for supercapacitors .
 Chemical: polystyrene; Chemical: Cu2O; Chemical: Ni
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: polystyrene, Cu2O, Ni 
Answer:
 Chemical: polystyrene; Chemical: Cu2O; Chemical: Ni