CoS₂ Nanoparticles-Embedded N‑Doped Carbon Nanobox Derived from ZIF-67 for Electrocatalytic N₂‑to-NH₃ Fixation under Ambient Conditions

NH₃ is an indispensable chemical with numerous applications; however, its large-scale synthesis highly relies on the industrial Haber–Bosch process, which is performed under harsh conditions (high temperature and pressure). The electrochemical N₂ reduction reaction (NRR) provides an avenue to synthesize NH₃ under ambient conditions, yet durable and high-efficiency catalysts are needed. Herein, we report that a CoS₂ nanoparticles-embedded N-doped carbon nanobox derived from ZIF-67 works as an efficient NRR catalyst under mild conditions. This catalyst achieves a large NH₃ yield of 17.45 μg h^–1 mg^–1_cat. and a high Faradaic efficiency of 4.6% at −0.15 V vs the reversible hydrogen electrode in 0.1 M HCl. Furthermore, high electrochemical stability is displayed by the as-prepared catalyst.