A chromium sulfide-based nanohybrid (NC/Cr2S3) has been fabricated by a facile strategy of pyrolysis and vulcanization of metal complex. In this nanocomposite, the in situ formed Cr2S3 nanoparticles with a mean size about ∼ 100 nm are confined by the nitrogen-doped carbon plates-derived from the metal complex. The composite is endowed with some structural advantages involving extended surface areas, increased catalytically active centers and enhanced conductivity. As an earth-abundant low-cost electrocatalyst for nitrogen reduction reaction (NRR), compared with bare Cr2S3, NC/Cr2S3 hybrid delivers a boosted and stable catalytic activity for NRR at a low potential under mild conditions. NC/Cr2S3 is able to exhibit a high ammonia yield rate of 30.33 μg mg-1cat h−1 at −0.4 V vs RHE in sodium sulfate solution with a Faradic efficiency up to 7.66 %. Moreover, no hydrazine byproduct can be detected, showcasing a satisfactory selectivity.