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Crucial Role of Surface Hydroxyls on the Activity and Stability in Electrochemical CO2 Reduction
Ist Teil von
Journal of the American Chemical Society, 2019-02, Vol.141 (7), p.2911-2915
Ort / Verlag
United States: American Chemical Society
Erscheinungsjahr
2019
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The role of surface hydroxyls is significant for understanding catalytic performance of metallic oxides for CO2 electroreduction reaction (CO2ER). This Communication describes, employing SnO x as a model system, how to moderate coverage of hydroxyl to derive a stable Sn branches catalyst for CO2ER with a 93.1% Faradaic efficiency (FE) of carbonaceous products. With use of in situ attenuated total reflection surface enhanced infrared adsorption spectroscopy (ATR-SEIRAS) and density functional theory (DFT) calculations, we found that a proper amount of surface hydroxyls offered effective sites to boost CO2 adsorption via hydrogen bond. However, a higher surface coverage of hydroxyls leads to self-reduction of Sn–OH. We also explained the competition between self-reduction and CO2 reduction over Sn-based catalysts. The findings revealed the quantitative correlation between surface coverage of hydroxyl and CO2ER activity and suggested a logical extension to other metal oxide catalysts for CO2ER.
Sprache
Englisch
Identifikatoren
ISSN: 0002-7863
eISSN: 1520-5126
DOI: 10.1021/jacs.8b13786
Titel-ID: cdi_proquest_miscellaneous_2179516845
Format
–
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