Metal–Organic Framework-Derived Cu₂O–Cu₂S Heterojunction Nanostructures on Copper Foams for Furfural Electrohydrogenation

In the pursuit of environmentally benign electrohydrogenation processes for furfural (FF) conversion, we innovatively synthesized Cu₂O–Cu₂S heterojunction nanostructures on copper foams (Cu₂O–Cu₂S@CF), as derived from the metal–organic framework (MOF) through a two-step method. Capitalizing on the porous structure and electronic tunability of the MOF, the heterostructured Cu₂O–Cu₂S@CF catalyst was meticulously controlled by modulating precursor types and optimizing the calcination treatment. This electrocatalyst demonstrated outstanding efficiency in the electrohydrogenation of FF to furfuryl alcohol (FA), achieving a very low potential of −93 mV_RHE at −10 mA cm^–2 and rapid kinetics. Its remarkably stable performance was validated by the cycling tests. Simultaneously, the catalyst exhibited exceptional selectivity (99.3%) and yield (98.5%) in the conversion of FF to FA, even in the presence of competitive reactions. This study provides some valuable insights for green and sustainable conversion of biomass-based compounds into high value-added products by electrocatalysis.