14886
The p - type nature of the Cu 2 Nb 8 O 2 1 particles was confirmed in photoelectrochemical measurements on polycrystalline films that show a strong photocathodic current under visible - light irradiation in aqueous solutions .
 Chemical: Cu 2 Nb 8 O 2 1
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: Cu 2 Nb 8 O 2 1