Jee, Michael Shincheon Kim, Haeri Jeon, Hyo Sang Chae, Keun Hwa Cho, Jinhan Min, Byoung Koun Hwang, Yun Jeong 2024-01-20T01:04:27Z 2024-01-20T01:04:27Z 2021-09-05 2017-06-15 0920-5861 https://pubs.kist.re.kr/handle/201004/122621 We investigated properties involved in the enhancement in electrocatalytic carbon dioxide (CO2) reduction to carbon monoxide (CO) in electrochemically treated Ag surfaces with surface sensitive analysis methods such as Auger spectroscopy, atomic force microscopy (AFM) coupled with Kelvin probe force microscopy (KPFM) techniques, and near edge X-ray absorption fine structure (NEXAFS) spectroscopy. The absence of Ag M(4,5)VVAuger signals for the electrochemically treated Ag indicate the presence of localized surface oxygen (O) which survives on the best performing Ag electrocatalysts even in the reductive environment of the CO2 reduction reaction. Higher work functions were located at the nanostructure boundaries observed by KPFM/AFM implying the higher surface O concentrations in these regions. Furthermore, NEXAFS measured the selective prominence of pi* states over sigma* in the active Ag surfaces which suggests stronger interaction with intermediates of CO2 reduction while minimizing the OH interaction contributing to increase CO2 reduction activity and selectivity. These results provide direction in engineering surfaces for efficient electrochemical CO2 conversion. (C) 2016 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV CARBON-DIOXIDE REDUCTION RENEWABLE ENERGY ELECTRODES NANOPARTICLES CATALYSTS AG ELECTROCATALYST MONOLAYERS CONVERSION STABILITY Stable surface oxygen on nanostructured silver for efficient CO2 electroreduction Article 10.1016/j.cattod.2016.09.026 1 CATALYSIS TODAY, v.288, pp.48 - 53 CATALYSIS TODAY 288 48 53 scie scopus 000405254600008 2-s2.0-84995801564 Chemistry, Applied Chemistry, Physical Engineering, Chemical Chemistry Engineering Article CARBON-DIOXIDE REDUCTION RENEWABLE ENERGY ELECTRODES NANOPARTICLES CATALYSTS AG ELECTROCATALYST MONOLAYERS CONVERSION STABILITY CO2 electroreduction Silver Surface oxygen NEXAFS Auger spectroscopy KPFM