Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 5, Pages 3003-3011Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09780
Keywords
SOFC; perovskites; cathode; CO2 poisoning; carbonate
Funding
- National Nature Science Foundation of China [21576135]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Educational Commission of Jiangsu Province of China [13KJA430004]
- Program for Jiangsu Specially-Appointed Professors
- Youth Fund in Jiangsu Province [BK20150945]
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A solid oxide fuel cell (SOFC) is a highly efficient device for converting chemical energy to electrical energy. In addition to the efforts to reduce the operating temperature of SOFCs to below 600 degrees C,, research studies of the basic mechanism of CO2 poisoning on cathode materials are envisioned to improve the operation of dual-chamber SOFCs using ambient air. In this work, we comparatively studied the CO, poisoning effect on two highly active perovskites SrSc0.175Nb0.025CO0.8O3-delta (SSNC) and Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF), using complementary characterization techniques, e.g., powder X-ray diffraction (XRD); Fourier transform-infrared (FT-IR) spectroscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM), CO2-temperature-programmed desorption (CO2-TPD), and electrochemical impedance spectroscopy (EIS). The SSNC cathode shows better tolerance to CO2 as compared with BSCF, which is attributed to the absence of Ba, higher average Metal oxygen bond energy (ABE) of SSNC, arid the higher acidity of Nb5+ cations, whereas the oxygen vacancy concentration plays a less important role.
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