A simple synthesis of Co₃O₄@CNT to boost electrochemical nitrogen fixation

The synthesis of ammonia in industrial-scale mainly depends on Haber-Bosch process, which entails huge energy consumption and massive CO₂ emission. Electrocatalytic nitrogen-to-ammonia is a promising alternative, which could be powered by renewable energy source. However, the development of proper catalysts with good yield, superior stability, and excellent selectivity is one of the most challenges for electrochemical reduction of nitrogen. Here, a cost-efficient electrocatalytic material, Co₃O₄ coated on CNT, was reported as an electrocatalytic nitrogen reduction reaction catalyst to generate NH₃. Applying CNT as an excellent substrate for growing Co₃O₄ could effectively improve the electronic conduction properties and boost N₂ adsorption. This catalyst attains a favorable NH₃ yield as 27. 16 ± 2.22 µg h⁻¹ mg_cat.⁻¹ at −0.49 V vs. RHE in 0.1 M Na₂SO₄ solution under ambient conditions. It also shows strong electrochemical durability and excellent selectivity.