B-doped MoS₂/MoO₂ heterostructure catalyst for the electrocatalytic reduction of N₂ to NH₃

B-atom doping is considered as an effective modification strategy to improve the efficiency of catalysts for Nitrogen Reduction Reaction (NRR). In this paper, molybdenum-based metal materials are used as substrates and B-atom doping is used to enhance the ability of catalysts to capture nitrogen molecules, thus improving the efficiency and selectivity of electrocatalytic ammonia synthesis. B-doped MoS₂/MoO₂ heterostructure catalysts (BM-0, BM-1 and BM-5) were successfully prepared by adding different mass ratios of boric acid (0: 1, 1: 1 and 5: 1) as B sources. BM-5, as one of the materials, is a spherical nanoflower encapsulated in nanoparticles with a morphology abundant active sites and high conductivity. The NRR testing of the three materials determined that the ammonia yield of BM-5 was up to 42.23 μg·h⁻¹·mg_cat⁻¹ at −0.6 V relative to the reversible hydrogen electrode (vs. RHE) and the Faraday efficiency was up to 2.78% at −0.5 V (vs. RHE).