A New In Situ Synthetic Triple-Conducting Core-Shell Electrode For Protonic Ceramic Fuel Cells

Triple-conducting cathodes (H+/O2-/e(-)) have attracted more and more interest because they have great responsibility for lowering operating temperature and driving the commercial application of protonic ceramic fuel cells. In this paper, the heterostructure triple-conducting cathode with the pseudo-cubic phase SrFe0.9Nb0.1O3-delta as the core and the tetragonal phase Sr3Fe1.8Nb0.2O7-delta as the shell was in situ synthesized by surface cladding mixed ionic and electronic conductor SrFe0.9Nb0.1O3-delta powders with Sr(NO3)(2). Then, an electronic conducting relaxation method was implored to characterize the proton uptake ability of the shell layer SFN327. The synergistic effects of the heterostructure region and proton conductivity of the shell layer SFN327 make the core-shell structure SFN113@327 show superior electrochemical performance compared with the parent SFN113 as the electrode. The results of the electrochemical performance test of the symmetric cell and the single cell both verified the above mentioned. This paper mainly presents a new idea to prepare the electrode materials for protonic ceramic fuel cells.