Plasmon-induced　hot　electrons　offer　unique　advantages　in　solar-light-driven　chemical　reactions.　Noble　metal　nanostructures　have　been　the　most　studied　plasmonic　materials,　but　the　hot　electron　lifetime　is　extremely　short.　Here,　we　have　discovered　extraordinarily　long-lived　hot　electrons　in　degenerately　doped　molybdenum　oxides　with　surface　plasmon　resonance　in　the　visible　and　near-infrared　region.　Their　lifetime　is　nanosecond-scale,　which　is　enhanced　by　4　orders　of　magnitude　compared　to　their　noble　metal　counterparts.　Such　a　property　is　ascribed　to　the　quasi-metallic　feature　of　molybdenum　oxides　driven　by　hydrogen　dopant-induced　bandgap　trap　states,　in　which　the　electron–phonon　scattering　is　dominant　over　the　ultrafast　electron–electron　scattering　in　the　decay　dynamics　of　hot　electrons.　The　plasmonic　dye　oxidation　and　hydrogen　evolution　are　explored　without　the　coupling　of　semiconductors,　providing　a　viable　way　towards　expanding　the　candidates　for　direct　plasmonic　photocatalysis.　©　2022　Elsevier　Ltd