Manipulating the Oxidation State of Cu_xO Catalysts to Optimize the Selectivity of Gaseous Products in Electrochemical CO₂ Reduction

Abstract

Copper‐based (Cu‐based) catalysts can efficiently convert carbon dioxide to multicarbon products by electrochemical reduction. In this paper, the electrocatalyst with the coexistence of three valence states of Cu(0)‐Cu(I)‐Cu(II) was successfully prepared by adjusting the experimental conditions. The catalyst was derived from Cu/Cu2O prepared on carbon cloth and exhibited excellent CO2 reduction performance. For carbon‐gaseous products, the Faradaic efficiencies for the Cu‐2 catalyst consisting of Cu(0)‐Cu(I)‐Cu(II) were 35.45±3.40 % at −1.66 V vs. RHE, of which 23.85±1.18 % for C2H4. And the synergistic effect of Cu(0)‐Cu(I)‐Cu(II) significantly improved the selectivity of the catalyst to C2H4. This paper provided an efficient method to rationally tune the valence state of Cu‐based catalysts to improve CO2 reduction performance.

Rational Construction of a Triple-Phase Reaction Zone Using CuO-Based Heterostructure Nanoarrays for Enhanced Water Oxidation Reaction

“…29,30 Moreover, the peaks of binding energies at 941.1, 943.6, and 962.2 eV are indexed as concomitant satellite peaks. 23 Compared with CuO/CF, CuO/Mn 3 O 4 /CF-4 presents a visibly positive shift around 0.3 eV compared to that of both Cu + 2p and Cu 2+ 2p peaks, suggesting the modulated electron configuration between CuO and Mn 3 O 4 components. In addition, the Cu LMM spectra toward CuO/ CF and CuO/Mn 3 O 4 /CF-4 are recorded with peaks locating at 569.2 eV (Figure 3d), evincing the absence of Cu 0 species in as-fabricated samples.…”

“…13-0420) and metallic Cu (PDF no. 04-0836). , The weak crystallinity of the Mn-related composition results in unobvious diffraction peaks in the XRD pattern. For CuO/Mn 3 O 4 /CF-4, the characteristic peaks of Mn 3 O 4 (PDF no.…”

“…44-0706) are distinctly observed with concomitant Cu 2 O species (PDF no. 05-0667) after annealing the precursor at 300 °C. ,, For comparison, the Mn 3 O 4 catalyst is prepared and the corresponding XRD pattern displayed in Figure S8c. The observed diffraction peaks are attributed to tetragonal Mn 3 O 4 (PDF no.…”

“…As shown in full spectra (Figure S8d), the observed signals of Cu 2p, Mn 2p, and O 1s are, respectively, identified with binding energies around 945, 642, and 531 eV for CuO/Mn 3 O 4 /CF-4. The high-resolution XPS Cu 2p spectra results (Figure c) displayed that the characteristic peaks at binding energies of 933.1 and 952.7 eV are well-matched to Cu + 2p 3/2 and Cu + 2p 1/2 for the thus-fabricated CuO/CF, respectively, corresponding Cu 2+ 2p 3/2 and Cu 2+ 2p 1/2 at 934.1 and 954.0 eV. , Moreover, the peaks of binding energies at 941.1, 943.6, and 962.2 eV are indexed as concomitant satellite peaks . Compared with CuO/CF, CuO/Mn 3 O 4 /CF-4 presents a visibly positive shift around 0.3 eV compared to that of both Cu + 2p and Cu 2+ 2p peaks, suggesting the modulated electron configuration between CuO and Mn 3 O 4 components.…”

Unraveling the Impact of Curvature on Electrocatalytic Performance of Carbon Materials: A State‐of‐the‐Art Review

“…However, the practical application of these electrocatalytic reactions faces significant hurdles due to slow kinetics and complex reaction pathways [14–16] . Consequently, cutting‐edge international research is concentrated on the design and development of high‐performance electrocatalysts, aiming to overcome these obstacles [17–19] …”