Abstract
Here we report the results of a study on active surface species of a pristine and modified (Li-Na)2CO3 eutectic using in situ Raman spectroscopy technique. The effects of gas compositions, temperature, time, and alkaline earth have been systematically studied. The species of CO42–, HCO4–, and C2O52– are identified as the three major active species on the surface of (Li-Na)2CO3 eutectic by a combined Raman spectroscopy and theoretical density functional theory calculations. The results further reveal that CO42–, HCO4–, and C2O52– are preferably formed in the presence of O2, H2O, and high CO2 concentration. With the addition of Ba to the pristine (Li-Na)2CO3 eutectic, the Raman CO42–/HCO4– shifts become more pronounced.
Highlights
Molten carbonate fuel cells (MCFCs) are a class of energy-efficient and low-emission power generators (Morita et al, 2002; Watanabe et al, 2006; Kawase, 2017)
We have previously used Raman spectroscopy to probe the surface chemistry of an Ag-MC (Molten Carbonate) membrane operated under a flue gas condition containing O2 and CO2 to facilitate our understanding of why enhanced oxygen permeation was observed (Tong et al, 2016)
In this study, the in situ Raman spectroscopy technology was selected to identify the species of molten carbonate exposed to varies atmospheres at MCFC operating temperatures
Summary
Molten carbonate fuel cells (MCFCs) are a class of energy-efficient and low-emission power generators (Morita et al, 2002; Watanabe et al, 2006; Kawase, 2017). We have previously used Raman spectroscopy to probe the surface chemistry of an Ag-MC (Molten Carbonate) membrane operated under a flue gas condition containing O2 and CO2 to facilitate our understanding of why enhanced oxygen permeation was observed (Tong et al, 2016). We concluded from both experimental and theoretical data that LiCO4− was the active species on the Ag-MC membrane surface under simulated flue gas conditions and the extra oxygen in CO42− ligand relative to CO32− is the reason for the increased oxygen transport. In this study, the in situ Raman spectroscopy technology was selected to identify the species of molten carbonate exposed to varies atmospheres at MCFC operating temperatures.
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