Catalytic activity of PdNPs/CNx towards FAO is better than commercial Pt/C and Pd/C. Mass activity of PdNPs/CNx is 7.6 and 36 times of Pd/C and Pt/C at 0.4 V in RHE. PdNPs/CNx has higher stability towards FAO than commercial Pt/C and Pd/C. Strong interaction between Pd-NPs, g-CNx lowering Rct which attributed to superior FAO.