Novel　Cobalt/Nitrogen　co-doped　graphene　piezoelectric　nanofoams　(CoNG),　featuring　a　confined　Co-N5　configuration　with　four　coordinating　N　atoms　being　from　the　same　NG　layer　and　an　additional　coordinating　N　atom　coming　from　an　adjacent　nitrogen　doped　graphene　(NG)　layer,　have　been　synthesized　for　nitrogen　fixation　under　low-frequency　hydromechanical　energy.　The　Co–N5　configuration　could　increase　local　dipole　moments　in　the　a,　b　and　c　directions,　thereby　significantly　improving　the　piezoelectric　properties.　On　the　other　hand,　the　Co–N　bonds　bridging　between　neighboring　NG　layers　effectively　serve　as　interlayer　electronic　transport　channels,　enhancing　carrier　spatial　separation　in　CoNG.　It　is　due　to　the　introduction　of　the　versatile　Co–N5　conformation　that　CoNG　is　indeed　capable　of　piezocatalytic　nitrogen　fixation　under　low-frequency　stirring　force,　yielding　NH4+　and　H2　at　rates　of　0.64　and　14.10　µmol·g−1·h−1,　respectively.　Which　are　markedly　higher　than　those　achieved　with　NG　(0.32　μmol·g−1·h−1　and　9.51　μmol·g−1·h−1).　Isotopic　15N2　labeling　confirms　the　nitrogen　source　of　ammonia.　Furthermore,　DFT　calculations　reveal　that　nitrogen　molecules　adsorb　predominantly　in　an　end-on　manner　at　the　Co　sites　and　form　NH3　in　a　distal　hydrogenation　pathway.　Moreover,　CoNG　demonstrates　16.5-fold　and　3.4-fold　enhancements　in　water　splitting　and　rhodamine　B　degradation　efficiency,　respectively,　in　comparison　with　NG.　This　work　establishes　a　sustainable　pathway　for　ambient-condition　ammonia　synthesis　and　expands　the　application　scope　of　piezocatalysis　in　green　chemistry.　©　2025