Heterojunctions of silver–iron oxide on graphene for laser-coupled oxygen reduction reactions

Abstract

We report a two-step hybridization of N-doped graphene and Ag-decorated Fe₂O₃ hematite to realize a balanced oxygen adsorption/desorption equilibrium and a laser-coupled ORR (LORR). The stable plateau currents with n values of 3.9 in a wide potential range (0.2–0.7 V) and 7.5% peroxide inhibition of the LORR are found to be directly associated with the Ag/Fe₂O₃ heterojunction, where interactions of semiconductor band gap excitation and plasmonic resonance-induced hot electrons are proposed to occur.