Single crystals of 0.91Pb(Zn 1/3 Nb 2/3 )O 3 -0.09PbTiO 3 , SrTiO 3 and BaTiO 3 , and ceramic pellets of CaCu 3 Ti 4 O 12 and BiFeO 3 have been studied and compared through electrochemical hydrogen charging, in which the oxides were coated with silver electrodes to electrolyze water as the cathode. Great diversity has been observed in the stability of the oxides: 0.91Pb(Zn 1/3 Nb 2/3 )O 3 -0.09PbTiO 3 was quickly decomposed; hydrogen could enter the lattice of the other four oxides, but their properties were influenced at extremely different speeds. Such a great diversity in stability against hydrogen among perovskite-type oxides highlights the importance of reliability study over functional oxides materials.
Lack of suitable cathode restricts the development of proton-conducting solid oxide fuel cell (H-SOFC). Perovskite material LBSCCF was synthesized by sol-gel method in this study. It had good chemical compatibility with the electrolyte material BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb). The average thermal expansion coefficients of LBSCCF was 19.92×10-6 K-1, higher than that of BZCYYb. The variations of oxygen content under different temperatures ensures enough oxygen vacancies in the cathode during the operating temperature. Single cells with LBSCCF-BZCYYb/BZCYYb/Ni-BZCYYb configuration were fabricated and tested. The maximum power density of 965.4 mW cm-2 was obtained at 750 °C, demonstrating that the LBSCCF-BZCYY composite material is a promising candidate cathode for H-SOFC.
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