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 0.05M H2SO4, the Mo-700/rGO electrode achieved a Faradic efficiency of 12.7% at -0.15V versus reversible hydrogen electrode (RHE), and an ammonia yield of 3.93 mu gh-1cm-2 at -0.2V versus RHE.