Stable surface oxygen on nanostructured silver for efficient CO2 electroreduction
- Stable surface oxygen on nanostructured silver for efficient CO2 electroreduction
- 채근화; 민병권; 황윤정; 지신천; 김해리; 전효상; 조진한
- CO2 electroreduction; Silver; Surface oxygen; NEXAFS; Auger spectroscopy; KPFM
- Issue Date
- Catalysis today
- VOL 288-53
- tWe investigated properties involved in the enhancement in electrocatalytic carbon dioxide (CO2) reduc-tion to carbon monoxide (CO) in electrochemically treated Ag surfaces with surface sensitive analysismethods such as Auger spectroscopy, atomic force microscopy (AFM) coupled with Kelvin probe forcemicroscopy (KPFM) techniques, and near edge X-ray absorption fine structure (NEXAFS) spectroscopy.The absence of Ag M4,5VV Auger signals for the electrochemically treated Ag indicate the presence of local-ized surface oxygen (O) which survives on the best performing Ag electrocatalysts even in the reductiveenvironment of the CO2reduction reaction. Higher work functions were located at the nanostructureboundaries observed by KPFM/AFM implying the higher surface O concentrations in these regions. Fur-thermore, NEXAFS measured the selective prominence of ∗ states over ∗ in the active Ag surfaces whichsuggests stronger interaction with intermediates of CO2reduction while minimizing the – OH interac-tion contributing to increase CO2reduction activity and selectivity. These results provide direction inengineering surfaces for efficient electrochemical CO2conversion.
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