Stabilization of cuσ+ via strong Cu-O-Si interface for efficient electrocatalytic acetylene semi-hydrogenation

Abstract

The development of a high-performance electrocatalytic acetylene semi-hydrogenation catalyst is the key to the selective removal of acetylene from industrial ethylene gas and non-oil route to ethylene production. However, it is still hampered by the deactivation of the catalyst and hydrogen evolution interference. Here, we proposed an interface engineering strategy involving the Cu and cupric oxide nanoparticles dispersed on amorphous SiO₂ (Cu/CuO_x/SiO₂) by a simple stöber method. x-ray photoelectron spectroscopy demonstrated the strong interfacial interaction between cupric oxide nanoparticles and SiO₂. The formed Cu-O-Si interface stabilized the Cu^σ+ at high reduction potentials, thus improving the activity and stability of the acetylene reduction reaction, as confirmed by in situ Raman spectroscopy. Consequently, the electrochemical test results showed that at 0.5 M KHCO₃, the maximum Faraday efficiency (FE) of ethylene on the optimized Cu/CuO_x/SiO₂ reached 96%. And ethylene FE remains above 85% at −100 mA cm⁻² for 40 h.