Gold nanoparticle decorated ceria nanotubes with significantly high catalytic activity for the reduction of nitrophenol and mechanism study

► Surface “bare” Au nanoparticles (AuNPs) were easily coupled on CeO2 nanotubes. ► The AuNP-CeO2 coupling does not need any additional chemicals. ► The Au/CeO2 catalyst shows superior activity in catalytic reduction of nitrophenol. ► The effect of AuNP surface and support on catalytic activity was investigated. ► Unique surface chemistry of AuNPs and Au-CeO2 interaction contribute to catalysis.