Operando characterization of metallic and bimetallic electrocatalysts for SOFC fuel electrodes operating under internal methane reforming conditions

Linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and operando Raman spectroscopy were used to study the electrochemical performance and carbon tolerance of SOFCs operating with niobium doped SrTiO 3 (STN) anodes infiltrated with combinations of Ni, Co, and Ce 0.8 Gd 0.2 O...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-03, Vol.10 (10), p.5550-5560
Main Authors: Drasbæk, Daniel B., Welander, Märtha M., Traulsen, Marie L., Sudireddy, Bhaskar R., Holtappels, Peter, Walker, Robert A.
Format: Article
Language:English
Subjects:
Anodes
Bimetals
Carbon
Carbon dioxide
Catalytic activity
Cell anodes
Electrocatalysts
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Electrode polarization
Electrodes
Fuels
Methane
Niobium
Operating temperature
Oxidation
Raman spectra
Raman spectroscopy
Reforming
Spectroscopy
Spectrum analysis
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Summary:Linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and operando Raman spectroscopy were used to study the electrochemical performance and carbon tolerance of SOFCs operating with niobium doped SrTiO 3 (STN) anodes infiltrated with combinations of Ni, Co, and Ce 0.8 Gd 0.2 O 2 (CGO) added to improve catalytic activity. Cell anodes were exposed to fuel feeds of humidified H 2 , pure CH 4 and combinations of CO 2 and CH 4 at an operating temperature of 750 °C. Under pure CH 4 , Raman data show that carbon forms on all anodes containing Ni. In cells with CGO, deposited carbon results in a decreased polarization resistance. This behavior may be due to benefits conferred by CGO to the electrocatalytic activity of triple phase boundaries, presumably through improved oxide ion conductivity and/or due to carbon securing a better electrical connection in the electrodes. Raman spectra from Co-only containing anodes show no sign of carbon deposition. The absence of observable carbon together with low frequency processes observed in the EIS suggest that Co may play a role in oxidizing carbon before measurable amounts accumulate.
ISSN:2050-7488
2050-7496
DOI:10.1039/D1TA07299D