https://scholars.lib.ntu.edu.tw/handle/123456789/575730
標題: | In situ unraveling of the effect of the dynamic chemical state on selective CO2reduction upon zinc electrocatalysts | 作者: | Chen T.-L Chen H.-C Huang Y.-P Lin S.-C Hou C.-H Tan H.-Y Tung C.-W Chan T.-S Shyue J.-J Chen H.M. HAO MING CHEN |
關鍵字: | Carbon monoxide; Electrocatalysts; Electrolysis; Thermooxidation; X ray absorption spectroscopy; Zinc compounds; Chemical state; Faradaic efficiencies; In-situ measurement; Product selectivities; Reaction mechanism; Thermal oxidation process; Thermally oxidized; Valuable chemicals; Zinc metallography | 公開日期: | 2020 | 卷: | 12 | 期: | 35 | 起(迄)頁: | 18013-18021 | 來源出版物: | Nanoscale | 摘要: | Unraveling the reaction mechanism behind the CO2 reduction reaction (CO2RR) is a crucial step for advancing the development of efficient and selective electrocatalysts to yield valuable chemicals. To understand the mechanism of zinc electrocatalysts toward the CO2RR, a series of thermally oxidized zinc foils is prepared to achieve a direct correlation between the chemical state of the electrocatalyst and product selectivity. The evidence provided by in situ Raman spectroscopy, X-ray absorption spectroscopy (XAS) and X-ray diffraction significantly demonstrates that the Zn(ii) and Zn(0) species on the surface are responsible for the production of carbon monoxide (CO) and formate, respectively. Specifically, the destruction of a dense oxide layer on the surface of zinc foil through a thermal oxidation process results in a 4-fold improvement of faradaic efficiency (FE) of formate toward the CO2RR. The results from in situ measurements reveal that the chemical state of zinc electrocatalysts could dominate the product profile for the CO2RR, which provides a promising approach for tuning the product selectivity of zinc electrocatalysts. This journal is ? 2020 The Royal Society of Chemistry. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091263939&doi=10.1039%2fd0nr03475d&partnerID=40&md5=de28bb8b7257abaeae19c4e4d0dfe88d https://scholars.lib.ntu.edu.tw/handle/123456789/575730 |
ISSN: | 20403364 | DOI: | 10.1039/d0nr03475d |
顯示於: | 化學系 |
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