Ultrafine CeO2 nanoparticles (<2 nm) on CNTs are synthesized on MWNT as support.
Ultrafine Au nanoparticles are synthesized on CeO2/MWNTs support.
The hybrid electrocatalysts show superb catalytic activity toward glycerol oxidation.
The catalytic activity of Au/CeO2/MWNT depends on the size of CeO2 NPs.