Atomic-Scale Spacing between Copper Facets for the Electrochemical Reduction of Carbon Dioxide

Hyung Mo Jeong, Youngkook Kwon, Jong Ho Won, Yanwei Lum, Mu Jeng Cheng, Kwang Ho Kim, Martin Head-Gordon, Jeung Ku Kang

研究成果: Article同行評審

8 引文 斯高帕斯(Scopus)


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.

期刊Advanced Energy Materials
出版狀態Published - 2020 三月 1

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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