In　the　design　of　photocatalysts　for　ammonia　synthesis,　the　construction　of　effective　nitrogen　(N-2)　adsorption　and　activation　sites　is　critical.　Herein,　Fe　single　atoms　were　effectively　fixed　on　the　surfaces　of　WO2.72-x　nanowires.　Electronic　interactions　between　single　Fe　atoms　and　WO2.72-x　resulted　in　a　d-band　center　shift　toward　the　Fermi　level　and　thus　enhancement　of　N-2　bonding　with　the　catalyst　surface.　The　studies　of　differential　charge　density　and　electron　localization　reveal　that　there　is　enhanced　electron　transfer　from　Fe-SA/WO2.72-x　to　the　adsorbed　N-2,　signifying　that　Fe　single　atoms　are　active　centers　for　N-2　activation.　Benefiting　from　electronic　interactions,　the　optimized　catalyst　shows　a　NH(4)(　)(+)generation　rate　of　186.5　mu　mol　g(-1　)h(-1)　during　photocatalytic　N-2　reduction.