Selective CO₂Electroreduction to Ethanol over a Carbon‐Coated CuO_xCatalyst

Abstract

The design of efficient copper(Cu)-based catalysts is critical for CO 2 electroreduction into multiple carbon products. However, most Cu-based catalysts are favorable for ethylene production while selective production of ethanol with high Faradaic efficiency and current density still remains a great challenge. Herein, we design a carbon-coated CuO x (CuO x @C) catalyst through one-pot pyrolysis of Cu-based metal-organic framework (MOF), which exhibits high selectivity for CO 2 electroreduction to ethanol with Faradaic efficiency of 46 %. Impressively, the partial current density of ethanol reaches 166 mA cm À 2 , which is higher than that of most reported catalysts. Operando Raman spectra indicate that the carbon coating can efficiently stabilize Cu + species under CO 2 electroreduction conditions, which promotes the CÀ C coupling step. Density functional theory (DFT) calculations reveal that the carbon layer can tune the key intermediate *HOCCH goes the hydrogenation pathway toward ethanol production.

SiO2assisted Cu0–Cu+–NH2composite interfaces for efficient CO2electroreduction to C2+products

“…This indicates that the oxidation state Cu on the catalyst surface is partially reduced, forming the Cu–Cu 2 O interface; therefore, the metal-oxide interface effect can effectively improve the formation rate of C 2+ from the CO 2 RR. 20 At the same time, the elements overlap each other in the EDX mapping of Cu 2 O@SiO 2 –NH 2 and Cu 2 O@SiO 2 samples, which proves that the Cu 2 O@SiO 2 –NH 2 catalyst still maintains a complete coating structure after the CO 2 RR (Fig. S14e, f and S15e†).…”

“…Upon applying the Cu 2 O-BN catalyst for the CO 2 RR process, the ratio of C 2 H 4 /CO increased by 1.62 times compared with that of the Cu 2 O catalyst. Similarly, Zang et al 20 designed a carbon-coated CuO x (CuO x @C) catalyst and the carbon layer on the catalyst surface effectively stabilized Cu + species, thereby facilitating the C–C coupling process. In the CO 2 RR process, the FE of ethanol reached 46%, and the partial current density reached 166 mA cm −2 .…”

Carbon-Coated NiMoOx Bimetallic Catalyst for Selective Hydrodeoxygenation of Lipids to Fatty Alcohols

“…The main byproducts of this HDO process are alkanes formed after the continuous deoxygenation of alcohols. , The adsorption capacity of catalysts for lipids is positively correlated with the selectivity of alkanes, , so we reason that the moderate adsorption capacity of catalysts for lipids is one of the key factors in controlling fatty alcohol selectivity. Coating a carbon layer on the surface of the catalyst is one of the main strategies to change the substrate adsorption capacity. − Meanwhile, the carbon coating can stabilize metal active species, thereby significantly reducing deactivation. − …”

Transient Pulsed Discharge Preparation of Graphene Aerogel Supported Asymmetric Cu Cluster Catalysts Promote CO2 Reduction to Ethanol

“…The carbon-supported nano Cu or CuO x catalysts rely on the absorption features of the *CO and *H on the Cu atoms, these catalysts could enhance their selectivity of C 2+ products and EtOH 16,17 . Furthermore, related researches have revealed that their low coordination Cu atoms in Cu nanoparticles are the source of CO 2 RR catalytic active sites 18,19 . The decreasing size of metal nanoparticles increases the speci c surface of the metal with more active atoms, enhancing the catalytic activity [20][21][22] .…”