21310
Enhanced photovoltaic performance of a dye - sensitized solar cell using graphene - TiO2 photoanode prepared by a novel in situ simultaneous reduction - hydrolysis technique .
 Chemical: graphene; Chemical: 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: graphene; Chemical: TiO2