Additive effect of Ce, Mo and K to nickel-cobalt aluminate supported solid oxide fuel cell for direct internal reforming of methane
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- Title
- Additive effect of Ce, Mo and K to nickel-cobalt aluminate supported solid oxide fuel cell for direct internal reforming of methane
- Authors
- Bu Ho Kwak; Jungdeok Park; Hee Chul Yoon; Hyeon Hui Kim; Lim Kim; Chung, JS
- Date Issued
- 2014-01
- Publisher
- 한국화공학회
- Abstract
- Direct internal reforming of methane (steam/carbon=0.031, 850 A degrees C) is tested using button cells of Ni-YSZ/ YSZ/LSM in which the anode layer is supported either on Ni-YSZ or on Ni-CoAl2O4. The Ni-CoAl2O4 supported cell shows little degradation with operating time, as a result of higher resistance against carbon deposition, whereas the Ni-YSZ supported cell deactivates quickly and suffers fracture in 50 h. Upon incorporation of additives such as K, Ce, or Mo into the Ni-CoAl2O4 support, cells with 0.5 wt% CeO2 exhibit the best stable performance as a result of reduced coke formation. Cells with 0.5 wt% Mo exhibit the lowest performance. Although no carbon deposit is detected in the cells with K2CO3 additives, their performance is worse than that in the CeO2 case, and, in constant-current mode, there is a sudden voltage drop to zero after a certain period of time; this time becomes shorter with increasing K content. The injection of potassium into the anode side facilitates the generation of OH- and CO (3) (2-) in the anode and promotes the diffusion of these ions to the cathode. Increased polarization resistance at the cathode and increased electrolyte resistance result in such a sudden failure.
- Keywords
- Solid-oxide Fuel Cell; Nickel-cobalt Aluminate Support; Direct Internal Reforming; Effect of Cerium; Molybdenum and Potassium; CARBON FORMATION; CATALYSTS; NI; POTASSIUM; NI/AL2O3; RESISTANCE; OXIDATION; ELECTRODE; ETHANE; LAYERS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14777
- DOI
- 10.1007/S11814-013-0185-6
- ISSN
- 0256-1115
- Article Type
- Article
- Citation
- KOREAN JOURNAL OF CHEMICAL ENGINEERING, vol. 31, no. 1, page. 29 - 36, 2014-01
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