8574
Anodic TiO ( 2 ) nanotubes with different structures , doping agents , and decorations have been studied in order to improve energy conversion and storage efficiencies such as in dye sensitized solar cells , solar fuels , and electrochemical supercapacitors .
 Chemical: TiO ( 2 )
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: TiO ( 2 )