19358
Ion - induced synthesis of uniform single - crystalline sulphide - based quaternary - alloy hexagonal nanorings for highly efficient photocatalytic hydrogen evolution .
 Chemical: sulphide; Chemical: hydrogen
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: sulphide, hydrogen 
Answer:
 Chemical: sulphide; Chemical: hydrogen