Abstract
Electrocatalytic semi-hydrogenation of acetylene(C2H2)over copper nanoparticles(Cu NPs)offers a promising non-petro-leum alternative for the green production of ethylene(C2H4).However,server hydrogen evolution reaction(HER)competi-tion in this process prominently decreases C2H4 selectivity,thereby hindering its practical application.Herein,a Cu-based composite catalyst,wherein porous carbon with nanoscale pores was used as a support,is constructed to gather the C2H2 feedstocks for suppressing the undesirable HER.As a result,the as-prepared catalyst exhibited C2H2 conversion of 27.1％and C2H4 selectivity of 88.4％at a C2H4 partial current density of 0.25 A/cm2 under optimal-1.0 V versus reversible hydrogen electrode(RHE)under the simulated coal-derived C2H2 atmosphere,significantly outperforming the single Cu NPs coun-terparts.In addition,a series of in situ and ex situ experimental results show that not only the porous nature of the carbon support but also the stabilized Cu0-Cu+dual active sites through the strong metal-support interactions enhance the adsorp-tion capacity of C2H2,leading to high C2H2 partial pressure,restraining the HER and thus improving the C2H4 selectivity.
维普
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