This　study　investigates　the　electrocatalytic　reduction　of　nitrates　using　three　novel　electrodes:　Cu@CNFs/NF,　Cu@CNTs/NF,　and　Cu@CB/NF,　synthesized　via　an　impregnation-calcination-electrodeposition　technique.　The　emphasis　is　on　the　role　of　different　carbon　materials,　which　serve　as　the　base　or　matrix　for　Cu,　and　their　influence　on　nitrate　reduction　and　nitrogen　selectivity.　Experimental　results　indicated　that　all　three-electrode　variants　outperformed　the　conventional　Cu/NF　electrode　in　nitrate　reduction　and　nitrogen　selectivity.　Among　these,　the　Cu@CNFs/NF　electrode　emerged　as　the　standout　performer,　achieving　an　impressive　nitrate　reduction　rate　of　up　to　98　%　and　a　nitrogen　selectivity　of　51　%　under　the　optimized　experimental　conditions　(pH　7,　nitrate　concentration　of　100　mg∙L-1　as　NO3–-N,　a　current　density　of　8　mA　cm−2,　a　sodium　sulfate　concentration　of　0.5　g∙L-1,　120　min,　anode:　Ti/RuO2-IrO2).　Stability　tests　confirmed　that　the　Cu@CNFs/NF　electrode　maintained　over　97　%　nitrate　removal　efficiency　across　ten　cycles,　highlighting　its　robustness　and　potential　for　practical　water　treatment　applications.　A　significant　enhancement　in　nitrogen　selectivity　of　Cu@CNFs/NF　to　96　%　was　observed　when　using　0.75　g∙L-1　NaCl　as　the　electrolyte　during　an　extended　electrolysis　period　of　180　min,　underscoring　its　potential　to　optimize　catalytic　efficiency.　Characterization　data　from　SEM,　XRD,　and　other　analyses　substantiate　that　the　incorporation　of　carbon　materials　augments　the　active　sites　of　copper;　Nitrogen　adsorption–desorption　experiments　further　illustrate　that　the　integration　of　carbon　materials　leads　to　an　increase　in　mesoporous　volume.　This　increase　promotes　adsorptive　interactions,　enhances　the　conversion　of　intermediates,　and　contributes　to　the　improvement　of　nitrate　reduction　and　nitrogen　selectivity.　These　results　highlight　the　potential　of　tailored　carbon　material　integration　for　enhancing　the　electrocatalytic　performance　of　electrodes　in　practical　water　treatment　applications.　©　2024