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Abstract Gold (Au)- and ceria (CeO₂)-based catalysts are amongst the most active catalysts for the gas phase CO oxidation reaction. Nevertheless, nanosized Au and CeO₂catalysts may encounter heat-induced sintering in thermochemical catalytic reactions. Herein, we report on the rational one-pot synthesis of ceria-reduced graphene oxide (CeO₂-RGO) using a facile ethylenediamine (EDA)-assisted solvothermal method. Standalone RGO and free-standing CeO₂were also prepared using the same EDA-assisted method for comparison. We then incorporated Au into the prepared samples by colloidal reduction and evaluated the catalytic activity of the different catalysts for CO oxidation. The RGO-supported CeO₂surpassed the free-standing CeO₂, exhibiting a 100% CO conversion at 285^oC compared to 340^oC in the case of CeO₂. Interestingly, the RGO-supported Au/CeO₂catalysts outperformed the Au/CeO₂catalysts and achieved a 100% CO conversion at 76^oC compared to 113^oC in the case of Au/CeO₂. Additionally, the Au/CeO₂-RGO catalyst demonstrated remarkable room-temperature activity with simultaneous 72% CO conversion. This outstanding performance was attributed to the unique dispersion and size characteristics of the RGO-supported CeO₂and Au catalysts in the ternary Au/CeO₂-RGO nanocomposite, as revealed by TEM and XPS, among other techniques.