CuO Co 3 O 4 Bifunctional Catalysts for Electrocatalytic 5‐Hydroxymethylfurfural Oxidation Coupled Cathodic Ammonia Production

The electrochemical coupling of biomass oxidation and nitrogen conversion presents a potential strategy for high value‐added chemicals and nitrogen cycling. Herein, in this work, CuO/Co 3 O 4 with heterogeneous interface is successfully constructed as a bifunctional catalyst for the electrooxidation of 5‐hydroxymethylfurfural to 2,5‐furandicarboxylic acid and the electroreduction of nitrate to ammonia (NH 3 ). The open‐circuit potential spontaneous experiment shows that more 5‐hydroxymethylfurfural molecules are adsorbed in the Helmholtz layer of the CuO/Co 3 O 4 composite, which certifies that the CuO/Co 3 O 4 heterostructure is conducive to the kinetic adsorption of 5‐hydroxymethylfurfural. In situ electrochemical impedance spectroscopy further shows that CuO/Co 3 O 4 has faster reaction kinetics and lower reaction potential in oxygen evolution reaction and 5‐hydroxymethylfurfural electrocatalytic oxidation. Moreover, CuO/Co 3 O 4 also has a good reduction effect on . The ex‐situ Raman spectroscopy shows that under the reduction potential, the metal oxide is reduced, and the generated Cu 2 O can be used as a new active site for the reaction to promote the electrocatalytic conversion of to NH 3 synthesis. This work provides valuable guidance for the synthesis of value‐added chemicals by 5‐hydroxymethylfurfural electrocatalytic oxidation coupled with while efficiently producing NH 3 .