Actions for Probing the Active Surface Sites for CO Reduction on Oxide-Derived Copper Electrocatalysts [electronic resource].

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Probing the Active Surface Sites for CO Reduction on Oxide-Derived Copper Electrocatalysts [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 9,808-9,811 : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
CO electroreduction activity on oxide-derived Cu (OD-Cu) was found to correlate with metastable surface features that bind CO strongly. OD-Cu electrodes prepared by H2 reduction of Cu2O precursors reduce CO to acetate and ethanol with nearly 50% Faradaic efficiency at moderate overpotential. Temperature-programmed desorption of CO on OD-Cu revealed the presence of surface sites with strong CO binding that are distinct from the terraces and stepped sites found on polycrystalline Cu foil. After annealing at 350 °C, the surface-area corrected current density for CO reduction is 44-fold lower and the Faradaic efficiency is less than 5%. These changes are accompanied by a reduction in the proportion of strong CO binding sites. Here, we propose that the active sites for CO reduction on OD-Cu surfaces are strong CO binding sites that are supported by grain boundaries. Uncovering these sites is a first step toward understanding the surface chemistry necessary for efficient CO electroreduction.
Report Numbers
E 1.99:llnl-jrnl--672859
llnl-jrnl--672859
Subject(s)
Note
Published through SciTech Connect.
07/30/2015.
"llnl-jrnl--672859"
Journal of the American Chemical Society 137 31 ISSN 0002-7863 AM
Arnau Verdaguer-Casadevall; Christina W. Li; Tobias P. Johansson; Soren B. Scott; Joseph T. McKeown; Mukul Kumar; Ifan E. L. Stephens; Matthew W. Kanan; Ib Chorkendorff.
Funding Information
AC52-07NA27344
View MARC record | catkey: 24045579