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Browsing by Author "Deng, Jiguang"

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  • Evaluation of the CO2 Tolerant Cathode for Solid Oxide Fuel Cells: Praseodymium Oxysulfates/Ba0.5Sr0.5Co0.8Fe0.2O3-δ
    Publication . Yang, Tao; Su, Chao; Wang, Wei; Meng, Lijian; Deng, Jiguang; Liu, Yu; Rathore, Shambhu; Shao, Zongping
    An effective praseodymium oxysulfate/Ba0.5Sr0.5Co0.8Fe0.2O3-δ composite cathode with high stability in 10% CO2/air was investigated. The addition of 50 vol.% of the praseodymium oxysulfate shows much better tolerance to CO2, and reduced the polarization resistance of the cathode to 1/3 comparing with that of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF). The CO2–temperature programmed desorption (TPD) and the electrochemical impedance spectroscopy (EIS) proved the effectiveness of the praseodymium oxysulfate phase to reduce the electrode resistance and to improve the CO2 resistance. The coefficient thermal expansion (CTE) rate along with the different volume percentage of praseodymium oxysulfate was also measured and it was found that the praseodymium oxysulfate helps to regulate the total CTE of the composite to match with doped-ceria electrolyte. It is proposed the higher acidity of Pr3+/4+ cations inhibited the reaction of alkaline earth metal oxide to form carbonates on the surface of the BSCF particles. The above results proved praseodymium oxysulfate/Ba0.5Sr0.5Co0.8Fe0.2O3-δ to be a highly active and stable cathode for solid oxide fuel cells.
    2018-07-26Journal article Restricted access Show more
  • Hydrothermal synthesis and optimization of boron doped LiZr2(PO4)3 Li-ion solid electrolyte
    Publication . Yang, Tao; Almeida, Carlosde; Han, Dezhi; Meng, Lijian; Deng, Jiguang; Silva, E.L. da; Santos, M.C.; Shi, Shikao
    Boron doped LiZr2(PO4)3 electrolyte was successfully synthesized via facile hydrothermal synthesis. Our results show that boron doping mainly happens on the Zr-site of Li1+xZr2-xBx(PO4)3 not the P-site of Li1+6xZr2(P1-xBxO4)3. Rietveld refinement of the unit-cell parameters was performed, and it was verified by consideration of Vegard’s law that it is possible to obtain phase purity up to x= 0.05 in Li1+xZr2-xBx(PO4)3. This corresponds with phases present in the XRD data, which shows the additional presence of the low temperature (monoclinic) phase for the powder sintered at 1200ºC for 12h of compositions with x ≥ 0.075. The compositions inside the solid solution undergo the phase transition from triclinic to rhombohedral when heating from 25 to 100ºC.
    2018Journal article Restricted access Show more