21312
The DSSCs based on the G - TiO2 nanocomposites improved their overall energy conversion efficiency to 7 . 1 % .
 Chemical: G - TiO2
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: G - TiO2