Noble-metal free Ce-Fe-Zr ternary oxides with synergistic dual active sites for accelerating NO reduction

•Comparable performance to noble metals was achieved for Ce-Fe-Zr oxides.•Completely NO conversion to N2 was realized at 223 °C without PGMs.•Dual active sites were established in one-step by FSP technology for TWCs.•FSP method is promising in breaking the limitation of dopants in oxide lattice.•FSP assisted Fe dopant dominated in NO activation and active oxygen transfer.