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The mechanism of discharge termination in silicon - air batteries , employing a silicon wafer anode , a room - temperature fluorohydrogenate ionic liquid electrolyte and an air cathode membrane , is investigated using a wide range of tools .
 Chemical: silicon; Chemical: silicon
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: silicon; Chemical: silicon