14059
A high power conversion efficiency of 10 . 24 % can be obtained in a dye - sensitized solar cell by incorporating multiwall carbon nanotubes inside a TiO2 nanorod photoanode .
 carbon, TiO2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 carbon, TiO2