Electrochemical nitrate reduction reaction (NORR) offers a promising technology for the synthesis of ammonia (NH) and removal of nitrate in wastewater. Herin, we fabricate a series of FeC nanoparticles in controllable pyridinic-N doped graphene (FeC@NG-X) by a self-sacrificing template method for the NORR. FeC@NG-10 exhibits high catalytic performance with a Faradaic efficiency (FE) of 94.03 % toward NH production at -0.5 V vs. Reversible hydrogen electrode (RHE) and an NH yield rate of 477.73 mmol h g . Additionally, the catalyst also has a FE above 90 % across a broad potential range and NO concentration range (12.5-500 mM). During the electrocatalytic process, the material experienced structural reconstruction, forming Fe/FeC@NG-X heterojunction. Experimental investigations demonstrate that the remarkable electrocatalytic activity is attributed to the high proportion of pyridinic-N content, and the reconstruction further enhances the overall reduction process.
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