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Carbon Dioxide Electroreduction using a Silver-Zinc Alloy [CO2 Electroreduction on a Ag-Zn Alloy] [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages 955-961 : digital, PDF file
Additional Creators:
SLAC National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
We report on CO2 electroreduction activity and selectivity of a polycrystalline AgZn foil in aqueous bicarbonate electrolyte. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) measurements show that the alloy foil was slightly enriched in zinc both at the surface and in the bulk, with a surface alloy composition of 61.3±5.4 at % zinc and with Ag5Zn8 as the most prominent bulk phase. AgZn is active for CO2 reduction; CO is the main product, likely due to the weak CO binding energy of the surface, with methane and methanol emerging as minor products. Compared to pure silver and pure zinc foils, enhancements in activity and selectivity for methane and methanol are observed. A five-fold increase is observed in the combined partial current densities for methane and methanol at –1.43 V vs. the reversible hydrogen electrode (RHE), representing a four- to six-fold increase in faradaic efficiency. Here, such enhancements indicate the existence of a synergistic effect between silver and zinc at the surface of the alloy that contributes to the enhanced formation of further reduced products.
Report Numbers:
E 1.99:1369412
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Published through SciTech Connect.
02/20/2017.
Energy Technology 5 6 ISSN 2194-4288 AM
Toru Hatsukade; Kendra P. Kuhl; Etosha R. Cave; David N. Abram; Jeremy T. Feaster; Anna L. Jongerius; Christopher Hahn; Thomas F. Jaramillo.
Funding Information:
AC02-76SF00515
1066515
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