27856
The investigation is facilitated through the use of a boron - doped diamond electrode , allowing the catalytic response to be clearly delineated from that of the direct oxygen reduction process at the electrode surface .
 Chemical: boron; Chemical: diamond; Chemical: oxygen
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: boron; Chemical: diamond; Chemical: oxygen