New aspects of operando Raman spectroscopy applied to electrochemical CO2 reduction on Cu foams

Abstract

Paper published as part of the special topic on Interfacial Electrochemistry and Photo(electro)catalysis ARTICLES YOU MAY BE INTERESTED INSelf-assembling of formic acid on the partially oxidized p(2 1) Cu( 110) surface reconstruction at low coverages

Oxygen induced promotion of electrochemical reduction of CO2 via co-electrolysis

“…An additional band at 360 cm −1 appears after the removal of Cu 2 O surf at 0 V RHE in the CO 2 atmosphere (Fig. 3b), whose assignment remains debated in the literature 36,41 , This band disappears at −0.4 V RHE , likely due to the conversion of adsorbed CO to other products at more negative potentials, and thus the corresponding species is unlikely to have a major impact on the CO 2 RR. A prominent band at 706 cm −1 appears at potentials below 0 V RHE in the O 2 atmosphere (Fig.…”

“…7), as it is a known intermediate in the ORR on multiple metal surfaces 42 . Interestingly, the Cu 2 O surf appears to persist to lower potentials in the O 2 atmosphere as the broad peak at 430-650 cm −1 corresponding to Cu 2 O surf does not completely disappear until −0.5 V RHE 21,36 . In the atmosphere of 10% O 2 + 90% CO 2 , the SER spectra exhibit features of those from in both O 2 and CO 2 atmospheres ( Fig.…”

“…To understand the mechanism through which co-electrolysis of CO 2 and O 2 boosts the CO 2 RR activity, in situ SERS is employed to identify surface species presenting during the co-electrolysis 36 . The Cu microparticle catalysts employed in this work readily exhibit the surface enhancement of Raman signals, which alleviate the need to introduce SERS-inducing particles 37 , 38 , and is consistent with several recent studies 36 , 37 , 39 . In the Ar atmosphere (Fig.…”

Atomic Layer Deposition of ZnO on CuO Enables Selective and Efficient Electroreduction of Carbon Dioxide to Liquid Fuels

“…[10] However, the complexity of adsorbates formed during CO 2 reduction makes it difficult to unambiguously assign this CÀHv ibrational mode. [11] To gain further insight into the enhanced ethanol formation on CuZn, we normalized the reaction rates of several representative products with respect to the electrochemical surface area. Thei ncorporation of Zn introduces active sites for the formation of CO,which could either desorb as gas or undergo further reduction to ethanol or hydrocarbons (Figure 3d).…”

Probing CO2 Reduction Pathways for Copper Catalysis Using an Ionic Liquid as a Chemical Trapping Agent

“…[21] Intriguingly,t his shoulder peak is absent on Cu-Foam-IL, implying that the IL can help suppress surface oxidation, which is in line with our previous study on Pt-based catalysts. [17e-g] Notwithstanding this difference,c onsidering the well documented readiness of copper oxide reduction under CO2RR conditions, [10,22] the presence of asmall portion of Cu(OH) 2 species on initial Cu-Foam is not expected to play as ignificant role in altering the product distribution. The CO2RR performance on Cu is sensitive to surface facets of Cu.…”