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- Title
Atomic‐Scale Spacing between Copper Facets for the Electrochemical Reduction of Carbon Dioxide.
- Authors
Jeong, Hyung Mo; Kwon, Youngkook; Won, Jong Ho; Lum, Yanwei; Cheng, Mu‐Jeng; Kim, Kwang Ho; Head‐Gordon, Martin; Kang, Jeung Ku
- Abstract
Copper (Cu) offers a means for producing value‐added fuels through the electrochemical reduction of carbon dioxide (CO2), i.e., the CO2 reduction reaction (CO2RR), but designing Cu catalysts with significant Faradaic efficiency to C2+ products remains as a great challenge. This work demonstrates that the high activity and selectivity of Cu to C2+ products can be achieved by atomic‐scale spacings between two facets of Cu particles. These spacings are created by lithiating CuOx particles, removing lithium oxides formed, and electrochemically reducing CuOx to metallic Cu. Also, the range of spacing (ds) is confirmed via the 3D tomographs using the Cs‐corrected scanning transmission electron microscopy (3D tomo‐STEM), and the operando X‐ray absorption spectra show that oxidized Cu reduces to the metallic state during the CO2RR. Moreover, control of ds to 5–6 Å allows a current density exceeding that of unmodified CuOx nanoparticles by about 12 folds and a Faradaic efficiency of ≈80% to C2+. Density functional theory calculations support that ds of 5–6 Å maximizes the binding energies of CO2 reduction intermediates and promotes C–C coupling reactions. Consequently, this study suggests that control of ds can be used to realize the high activity and C2+ product selectivity for the CO2RR.
- Subjects
CARBON dioxide reduction; ELECTROLYTIC reduction; X-ray absorption spectra; SCANNING transmission electron microscopy; DENSITY functional theory; CARBON dioxide
- Publication
Advanced Energy Materials, 2020, Vol 10, Issue 10, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201903423