Elemental　red　phosphorus　(red　P)　is　a　new　class　of　photocatalysts　with　a　desirable　bandgap　of　similar　to　1.7　eV　and　has　a　strong　visible-light　response.　Here,　we　show　that　the　efficiency　of　red　P　is　limited　by　severe　electron　trapping　at　deep　traps　that　are　intrinsic　to　the　different　crystal　facets　of　the　red　P.　To　overcome　this,　we　synthesized　the　red　P/RGO　(reduced　graphene　oxide)　composite　in　a　one-step　ampoule　chemical　vapor　deposition　synthesis　that　formed　a　conducive　interface　between　the　red　P　photocatalyst　and　the　RGO　acceptor　for　efficient　interfacial　charge　transport.　As　substantiated　through　photoelectrochemical　characterization　and　ultrafast　(femtoseconds)　transient　absorption　spectroscopy,　the　interfacing　with　RGO　provided　a　rapid　pathway　for　the　photocharges　in　red　P　to　be　interfacially　separated,　thereby　circumventing　the　slower　the　charge　trapping　process.　As　a　result,　up　to　a　sevenfold　increase　in　the　photocatalytic　hydrogen　production　rate　(apparent　quantum　yield　=　3.1%　at　650　nm)　was　obtained　for　the　red　P/RGO　relative　to　the　pristine　red　P.