期刊
ELECTROCHIMICA ACTA
卷 290, 期 -, 页码 440-450出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.09.102
关键词
Solid oxide fuel cell; Double perovskite anode; Electrochemical stability; Oxygen vacancy formation energy; Sulfur tolerance
资金
- Natural Science Foundation of China [91745203]
- Provincial Science and Technology Department [20180101073JC]
- US National Science Foundation [DMR-1210792]
- State-Sponsored Scholarship for Graduate Students from China Scholarship Council
The development of sulfur-tolerant anode materials is vital for solid-oxide fuel cells (SOFCs) that use conventional fossil fuels as fuel source to decrease emissions and increase energy-conversion efficiency. In this work, A(2)CrMoO(6-delta) (A = Ca, Sr, Ba) double perovskite materials are synthesized and evaluated as potential SOFC anode materials to assess their electrocatalytic activity and sulfur tolerance. All samples exhibit well-matched thermal expansion coefficient and satisfactory chemical compatibility with La0.9Sr0.1Ga0.8Mg0.2O3-delta (LSGM) electrolyte over the measured temperature range. Among the compositions investigated, the B-site partially disordered Sr2CrMoO6-delta (SCM) double perovskite exhibits superior electrical conductivity, cycle stability, and polarization resistance on LSGM electrolyte because of its high-symmetry structure and appropriate oxygen-vacancy concentration. The relatively stable single-cell performance in 100 ppm H2S/H-2 demonstrates that the behavior of SCM anode is more stable than that of nickel-yttria-stabilized zirconia. Postexposure characterization by X-ray diffraction is further conducted to evaluate SCM as potential sulfur-tolerant SOFC anode. (C) 2018 Elsevier Ltd. All rights reserved.
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