Transition metal chalcogenide MoS catalysts are highly selective for the electrochemical reduction of dinitrogen (N) to ammonia (NH) in aqueous electrolytes. However, due to the low solubility of N in water, limited N diffusion and mass transport have heavily restricted the yield and the faradaic efficiency (FE). Here, we have demonstrated a highly efficacious assembled gas diffusion cathode with hollow Co-MoS/N@C nanostructures to significantly improve the electrochemical reduction of N to NH. Our results revealed that the synthesized Co-MoS heterojunctions with abundant graphitic N groups exhibited a superb NH yield of 129.93 μg h mg and a high faradaic efficiency of 11.21% at -0.4 V vs. the reversible hydrogen electrode (RHE), as well as excellent selectivity and stability. The strategy described in this study offers new inspiration to design high-performance electrocatalyst assemblies for the sustainable environmental and energy applications.
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