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The photocurrent of catalyst - coated nanostructured inverse opal scaffold hematite photoanodes reached 0 . 81 and 2 . 1 mA / cm ( 2 ) at 1 . 23 and 1 . 53 V , respectively .
 Chemical: hematite
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: hematite