Details

Autor(en) / Beteiligte

• Deng, Wanyu
• Zhang, Lei
• Li, Lulu
• Chen, Sai
• Hu, Congling
• Zhao, Zhi-Jian
• Wang, Tuo
• Gong, Jinlong

Titel

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.