The　design　and　synthesis　of　efficient　and　cost-effective　electrocatalysts　are　vital　for　rechargeable　zinc-air　batteries　(ZABs).　Here,　nitrogen-doped　NiCo2O4　(N-doped　NiCo2O4)　was　prepared　and　used　as　a　promising　electrocatalyst　for　ZABs.　By　doping　with　nitrogen,　the　N-doped　NiCo2O4　catalyst　shows　higher　catalytic　activity　than　that　of　NiCo2O4　in　terms　of　higher　half-wave　potential　and　lower　Tafel　slope.　As　a　cathode　catalyst　for　flexible　rechargeable　zinc-air　batteries,　the　cell　with　N-doped　NiCo2O4　shows　excellent　cycling　performance.　X-ray　absorption　near-edge　structure　(XANES)　results　manifest　that　the　improved　catalytic　performance　is　attributed　to　the　enhanced　covalence　of　Co-O　and　Ni-O　and　more　active　sites　in　N-doped　NiCo2O4.　Moreover,　we　demonstrate　a　self-powered　system,　which　integrates　the　flexible　ZABs　and　TENG　to　power　a　LED　screen.