16262
We show that the recombination of electrons at the TiO ( 2 ) / QDs interface is as important as the recombination from TiO ( 2 ) and QDs to the electrolyte .
 TiO ( 2 ), TiO ( 2 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 TiO ( 2 ), TiO ( 2 )