期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 28, 页码 16209-16215出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b04983
关键词
-
资金
- Office of Science of the U.S. Department of Energy [DE-SC0004993, DE-AC02-05CH11231]
- NSF
Under ambient conditions, copper with oxygen near the surface displays strengthened CO2 and CO adsorption energies. This finding is often used to rationalize differences seen in product distributions between Cu-oxide and pure Cu electrodes during electrochemical CO2 reduction. However, little evidence exists to confirm the presence of oxygen within first few layers of the Cu matrix under relevant experimental reducing conditions. Using density functional theory calculations, we discuss the stability of subsurface oxygen from thermodynamic and kinetic perspectives and show that under reducing potentials subsurface oxygen alone should have negligible effects on the activity of crystalline Cu.
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