Enhanced Ammonia Synthesis by Mo2+-Rich Graphene-Based Nanocomposite

Graphene coupling molybdenum-based nanocomposite structures were synthesized by changing the pyrolytic temperature to implement the molybdenum-based optimized microstructure. The structural and surface properties tests showed that the presence of the most variable species and a high proportion of divalent molybdenum on the surface of the material could effectively expose catalytic sites to improve reduction ability of N 2 and inhibited hydrogen evolution reaction. Electrochemical investigations indicated that the Mo-700/rGO nanocomposite exhibited a significantly enhanced electrochemical ammonia synthesis performance. In 0.05 M H 2 SO 4 , the Mo-700/rGO electrode achieved a Faradic efficiency of 12.7% at − 0.15 V versus reversible hydrogen electrode (RHE), and an ammonia yield of 3.93 μ g h − 1 cm − 2 at − 0.2 V versus RHE.