26763
We present herein an example of nanocrystalline antimony - doped tin oxide ( nc - ATO ) disordered macroporous " inverse opal " 3D electrodes as efficient charge - collecting support structures for the electrolysis of water using a hematite surface catalyst .
 Chemical: antimony - doped tin oxide; Chemical: ATO; Chemical: hematite
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: antimony - doped tin oxide, ATO, hematite 
Answer:
 Chemical: antimony - doped tin oxide; Chemical: ATO; Chemical: hematite