Operando optical studies of solid oxide fuel cells operating on CO and simulated syngas fuels

JOURNAL OF POWER SOURCES

卷:492

Article

Maza, William A.¹  Steinhurst, Daniel A.²  McIntyre, Melissa D.³  Walker, Robert A.^3,4  Owrutsky, Jeffrey C.¹ 

[1] US Naval Res Lab, Chem Div, Washington, DC 20375 USA

[2] Nova Res Inc, Alexandria, VA 22308 USA

[3] Montana State Univ, Dept Chem & Biochem, Bozeman, MT 59717 USA

[4] Montana State Univ, Montana Mat Sci Program, Bozeman, MT 59717 USA

关键词: Solid oxide fuel cell;    Synthesis gas;    Syngas;    Chronopotentiometry;    Near-infrared thermal imaging;    Fourier transform infrared emission spectroscopy;    Raman;    Operando;    Spectroelectrochemical;   

DOI  :  10.1016/j.jpowsour.2021.229598

来源: Elsevier

【 摘 要 】

Solid oxide fuel cells (SOFCs) are attractive devices for combined power and heat generation because they can operate with a variety of fuels. Syngas (CO + H-2) is particularly attractive but many questions remain about its behavior on SOFC anodes including the relative oxidation efficiencies of CO and H-2 and tendency to form carbon deposits. In this report, operando spectroelectrochemical measurements, including infrared emission spectroscopy, near infrared thermal imaging, and vibrational Raman scattering, combined with spectrochronopotentiometry, are performed using anode-supported SOFCs operating with simulated syngas at 800 degrees C. Results quantify the fate of syngas over Ni-YSZ anodes in SOFCs related to their performance. SOFCs operating with simulated syngas mixtures are compared with those for H-2 and CO used separately. Thermal imaging shows more SOFC anode heating for H-2-rich syngas than for operating on CO or H-2 alone. We attribute this result to carbon gasification by water that is produced by H-2 oxidation. Raman spectra together with spectrochronopotentiometry experiments illustrate that carbon is not observed on the anode surface at 800 degrees C - although it is at 750 degrees C and 700 degrees C - yet carbon is likely present in the spectroscopically inaccessible, electrochemically active region at the electrolyte-electrode interface.

【 授权许可】

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