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Surface-Morphology-Dependent Electrolyte Effects on Gold-Catalyzed Electrochemical CO2 Reduction

Cited 38 time in Web of Science Cited 41 time in Scopus
Authors

Kim, Haeri; Park, Hyun Seo; Hwang, Yun Jeong; Min, Byoung Koun

Issue Date
2017-10
Publisher
American Chemical Society
Citation
The Journal of Physical Chemistry C, Vol.121 No.41, pp.22637-22643
Abstract
The electrocatalytic property of a flat or an oxide-derived nanostructure Au electrode was investigated using surface sensitive analysis methods such as impedance spectroscopy and Kelvin probe force microscopy (KPFM) when electrochemical conversion of carbon dioxide (CO2) to carbon monoxide (CO) was performed with either KHCO3- or NaHCO3-based neutral electrolyte. A strong dependence on the cation of the electrolyte was exhibited on the flat Au electrode surface. CO selectivity and capacitance dispersion are significantly higher with the KHCO3 electrolyte. On the other hand, the nanostructured Au electrodes, having much more improved activity and durability of CO2 reduction, showed much less electrolyte-dependent catalytic activity. The difference in CO selectivity with KHCO3 and NaHCO3 electrolytes can be explained by the difference in hydration level and consequent adsorption strength of the cations on the flat Au metal electrodes, implying that ion-pairing interactions between the metal, cations, CO2, and its intermediate play an important role in the reduction reaction. The local electric field fluctuation caused by the nanostructured rough Au surface can affect the electric double layer near the electrode surface and suppress the electrolyte-dependency of the reduction. Furthermore, according to X-ray spectroscopy analysis of the electrode after electrolysis, the nanostructured Au electrode is less prone to surface cation deposition. These results provide a basic understanding of the role of electrolyte cations in the CO2 reduction reaction.
ISSN
1932-7447
URI
https://hdl.handle.net/10371/218505
DOI
https://doi.org/10.1021/acs.jpcc.7b06286
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  • College of Natural Sciences
  • Department of Chemistry
Research Area Artificial Photosynthesis, Electrochemical CO2 Utilization, Solar to chemical conversion device, 인공 광합성, 전기화학적 CO 2 활용, 태양광을 화학으로 변환하는 장치

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