cocatalyst

noun

co·​cat·​a·​lyst ˌkō-ˈka-tə-ləst 

variants or co-catalyst

plural cocatalysts or co-catalysts

: 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

Word History

First Known Use

1961, in the meaning defined above