13532
Such a positive shift of [ Co ( III ) ( Ch ) ] ( + ) by protonation resulted in enhancement of the catalytic reactivity of [ Co ( III ) ( ChH ) ] ( 2 + ) for the two - electron reduction of O ( 2 ) with a lower overpotential as compared with that of [ Co ( III ) ( OEP ) ] ( + ) .
 Chemical: [ Co ( III ) ( Ch ) ] ( + ); Chemical: [ Co ( III ) ( ChH ) ] ( 2 + ); Chemical: O ( 2 ); Chemical: [ Co ( III ) ( OEP ) ] ( + )
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: [ Co ( III ) ( Ch ) ] ( + ); Chemical: [ Co ( III ) ( ChH ) ] ( 2 + ); Chemical: O ( 2 ); Chemical: [ Co ( III ) ( OEP ) ] ( + )