Direct unassisted hydrogen peroxide generation from oxygen and water on plasmonic Ag-graphene-Cu nanosandwitch

摘要: Abstract A nanosandwich made from Ag nanoparticles (Ag NPs) arrays, the two-dimension single-layer graphene (SG) and metallic Cu contact was constructed for hydrogen peroxide (H2O2) generation utilizing solar energy without an external bias. The shifting of binding towards lower in core-level electronic spectrum is evidence strong coupling between graphene, which can efficiently transfer hot-holes to by a built-in electric field so that hot-electrons on NPs are directly utilized initiate H2O2 generation. This Ag-graphene-Cu nanosandwitch provide stable photocurrent −15.8 μA cm−2, photovoltaic voltage 17.5 mV cm−2, yield 229.33 μM after 6 h. To understand mechanism oxygen reduction reaction (ORR) systems, electron number photocatalytic ORR surface facet were studied. systems with deposition time 180 s clearly shows amount 〈200〉 facets distributed nanoparticle surface, catalyze 2-electron pathway generate efficiently. novel offers new path potentially provides concept driving efficient chemical energy.