Asymmetric Acetylene Activation Enables Enhanced Electrochemical Ethylene Formation Kinetics.

Abstract

Copper (Cu)-based catalysts with weak ethylene (C2H4) adsorption exhibit a robust ability to suppress the overhydrogenation of electrocatalytic acetylene (C2H2) hydrogenation (EAH), providing a green alternative for C2H4 production. However, the unsatisfactory C2H4 formation kinetics due to the sluggishness of C2H2 reactants still limit its practical application potential. Herein, borate-decorated oxide-derived copper nanoparticles (OD Cu-B NPs) are designed to promote C2H2 activation and adsorption. As a result, the as-prepared catalysts deliver a partial current density of 720 mA cm-2 with a turnover frequency of 48.33 s-1, greatly outperforming the bare OD Cu counterpart. The symmetric electron distribution of C2H2 is revealed to be broken over the Cu-borate interface, making it easier to activate and adsorb, which accounts for the lowered hydrogenation barrier and enhanced selectivity, consequently promoting C2H4 formation kinetics through the EAH process.