A tandem catalyst, Cu2O NCs-C-Copc, consisting of acetylene black, cobalt phthalocyanine (Copc) and Cu2O nanocubes was developed for efficient converting of CO2 to C2H4. We propose the Cu2O NCs-C-Copc mechanism suppressing side reactions and simultaneously enriching CO. Here, we report faradaic efficiencies of C2H4 formation of up to 58.42 % at −1.1 V vs. RHE in 0.1 M KHCO3 and 70.31 % at −0.76 V vs. RHE in 1.0 M KOH.
Suppressing side reactions and simultaneously enriching key intermediates during CO2 reduction reaction (CO2RR) has been a challenge. Here, we propose a tandem catalyst (Cu2O NCs-C-Copc) consisting of acetylene black, cobalt phthalocyanine (Copc) and cuprous oxide nanocubes (Cu2O NCs) for efficient CO2-to-ethylene conversion. Density-functional theory (DFT) calculation combined with experimental verification demonstrated that Copc can provide abundant CO to nearby copper sites while acetylene black successfully reduces the formation energies of key intermediates, leading to enhanced C2H4 selectivity. X-ray photoelectron spectroscopy (XPS) and potentiostatic tests indicated that the catalytic stability of Cu2O NCs-C-Copc was significantly enhanced compared with Cu2O NCs. Finally, the industrial application prospect of the catalyst was evaluated using gas diffusion electrolyzers. The
of Cu2O NCs-C-Copc can reach to 58.4 % at −1.1 V vs. RHE in 0.1 M KHCO3 and 70.3 % at −0.76 V vs. RHE in 1.0 M KOH. This study sheds new light on the design and development of highly efficient CO2RR tandem catalytic systems.Zum Volltext