title: Evaluation of the CO2 Poisoning Effect on a Highly Active Cathode SrSc(0.175)Nb(0.025)Co(0.8)O(3-δ) in the Oxygen Reduction Reaction.
abstract: 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 °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 CO2 poisoning effect on two highly active perovskites SrSc(0.175)Nb(0.025)Co(0.8)O(3-δ) (SSNC) and Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-δ) (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, and the higher acidity of Nb(5+) cations, whereas the oxygen vacancy concentration plays a less important role.
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering and ‡College of Energy, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering and ‡College of Energy, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Guangming
authors.initials: G
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering and ‡College of Energy, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Gao
authors.initials: G
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering and ‡College of Energy, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Ran
authors.initials: R
authors.lastname: Ran
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering and ‡College of Energy, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering and ‡College of Energy, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Zongping
authors.initials: Z
authors.lastname: Shao
keywords: CO2 poisoning; SOFC; carbonate; cathode; perovskites