Durability and thermal cycling of Ni/YSZ cermet anodes for solid oxide fuel cells |
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Authors: | S Primdahl M Mogensen |
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Affiliation: | (1) Materials Research Department, Risø National Laboratory, 4000 Roskilde, Denmark |
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Abstract: | The long-term properties of Ni/yttria stabilized zirconia (YSZ) cermet anodes for solid oxide fuel cells were evaluated experimentally. A total of 13 anodes of three types based on two commercial NiO powders were examined. The durability was evaluated at temperatures of 850 C, 1000 C and 1050 C over 1300 to 2000 h at an anodic d.c. load of 300 mA cm–2 in hydrogen with 1 to 3% water. The anode-related polarization resistance, R
P, was measured by impedance spectroscopy and found to be in the range of 0.05 to 0.7 ![OHgr](/content/gwk261g9166l2760/xxlarge937.gif) cm2. After an initial stabilization period of up to 300 h, R
P varied linearly with time within the experimental uncertainty. At 1050 C no degradation was observed. At 1000 C a degradation rate of 10 m cm2 per 1000 h was found. The degradation rate was possibly higher at 850 C. A single anode was exposed to nine thermal cycles from 1000 to below 100 C at 100 C h–1. An increase in R
P of about 30 m cm2 was observed over the first two cycles. For the following thermal cycles R
P was stable within the experimental uncertainty. |
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Keywords: | cermet durability nickel solid oxide fuel cell thermal cycling yttria stabilized zirconia |
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