16205
Moreover , the key role of the electrolyte in limiting undesired energy - transfer reactions is highlighted by the observation that an electrolyte - free organic light - emitting diode comprising the same MCP emits red light .
 None
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:  
Answer:
 None