21343
The interdigital spaces thus formed between individual rods effectively accommodated the volume expansion and contraction of the alloy upon sodiation / desodiation , while additional carbon - coating engineered over these nanorods further suppressed Sn aggregation during extended electrochemical cycling .
 Chemical: carbon; Chemical: Sn
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: carbon; Chemical: Sn