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Nature and Distribution of Stable Subsurface Oxygen in Copper Electrodes During Electrochemical CO2 Reduction
Stockholm University, Faculty of Science, Department of Physics. SLAC National Accelerator Laboratory, United States.
Stockholm University, Faculty of Science, Department of Physics. SLAC National Accelerator Laboratory, United States; Stanford University, United States.
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Number of Authors: 10
2017 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 121, no 45, 25003-25009 p.Article in journal (Refereed) Published
Abstract [en]

Oxide-derived copper (OD-Cu) electrodes exhibit higher activity than pristine copper during the carbon dioxide reduction reaction (CO2RR) and higher selectivity toward ethylene. The presence of residual subsurface oxygen in OD-Cu has been proposed to be responsible for such improvements, although its stability under the reductive CO2RR conditions remains unclear. This work sheds light on the nature and stability of subsurface oxygen. Our spectroscopic results show that oxygen is primarily concentrated in an amorphous 1-2 nm thick layer within the Cu subsurface, confirming that subsurface oxygen is stable during CO2RR for up to 1 h at -1.15 V vs RHE. Besides, it is associated with a high density of defects in the OD-Cu structure. We propose that both low coordination of the amorphous OD-Cu surface and the presence of subsurface oxygen that withdraws charge from the copper sp- and d-bands might selectively enhance the binding energy of CO.

Place, publisher, year, edition, pages
2017. Vol. 121, no 45, 25003-25009 p.
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Chemical Sciences Nano Technology Materials Engineering
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URN: urn:nbn:se:su:diva-149797DOI: 10.1021/acs.jpcc.7b08278ISI: 000416202900013OAI: oai:DiVA.org:su-149797DiVA: diva2:1167703
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2017-12-19Bibliographically approved

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Cavalca, FilippoDiaz-Morales, OscarLiu, ChangPettersson, Lars G. M.Nilsson, Anders
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