26957
A mechanistic analysis using rotating ring - disk electrode ( RRDE ) voltammetry confirmed that negligible amounts of hydrogen peroxide were formed during the ORR .
 Chemical: hydrogen peroxide
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: hydrogen peroxide 
Answer:
 Chemical: hydrogen peroxide