co·cat·a·lyst | \ ˌkō-ˈka-tə-ləst 
\
\variants:
or co-catalyst
plural cocatalysts or co-catalysts
Definition of cocatalyst
: a substance or agent that brings about catalysis in conjunction with one or more others
Platina nanoparticles can serve as a co-catalyst in the reactions with electrons … — Science Daily
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Time Traveler for cocatalyst
The first known use of cocatalyst was in 1961
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