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The effect of impurities on the degradation of performances was investigated for the flatten tube type SOFC stack. The durability tests of 20-cells stack were conducted at 750°C (1023K) with dry H 2 for more than 5000h under a constant current density of 0.3Acm −2 . The voltage loss showed a linear relationship between voltage loss and operation time (about 1.5%/1000h). The ohmic resistance...
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