Stable surface oxygen on nanostructured silver for efficient CO2 electroreduction

Title
Stable surface oxygen on nanostructured silver for efficient CO2 electroreduction
Authors
채근화민병권황윤정지신천김해리전효상조진한
Keywords
CO2 electroreduction; Silver; Surface oxygen; NEXAFS; Auger spectroscopy; KPFM
Issue Date
2017-06
Publisher
Catalysis today
Citation
VOL 288-53
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/65886
ISSN
0920-5861
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KIST Publication > Article
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