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Nano-structured composite cathode by infiltration process for solid oxide fuel cells

Xifeng DING  Wenliang Zhu  
【摘要】:Solid oxide fuel cells(SOFCs) are one of the cleanest and most efficient energy conversion technologies from chemical energy to electricity. The resistance minimization of cathode for oxygen reduction reaction(ORR) is a key issue which contributes the main performance degradation in SOFCs at low temperature. Surface modification of the electrode through nano technology is a promising method for SOFCs performance improvement. Herein,we reported a novel solution-based infiltration process to decorate La Ni0.6Fe0.4O3(LNF) cathode surface. The phase composition,chemical compatibility,microstructure and electrochemical performance of the materials were investigated by X-ray diffractometry(XRD),scanning electron microscopy(SEM) and electrochemical impedance spectra(EIS). The introduction of the BSC nano particles and coating resulted in an electro-catalytic performance enhancement of the LNF cathode. The composite cathode with an infiltration ratio of 10wt% BSC demonstrated a polarization resistance of 0.13Ω·cm2 at 700 oC,which is 3 times lower than that of pure LNF. A short-run test of 80 h was carried out at 750 oC using symmetrical cells,and the BSC@LNF cathode shows a more stale electrochemical performance than Pr6O11@LNF. The improved stability could be attributed to the BSC film coated on the cathode surface,which may prevent the electrochemical performance degradation.

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