Cathode Optimization for an Inert-Substrate-Supported Tubular Solid Oxide Fuel Cell
Inert-substrate-supported tubular solid oxide fuel cells with multi-functional layers were fabricated in this work. The tubular single cells consisted of a porous yttria-stabilized zirconia inert-substrate supporting layer, a Ni anode current collecting layer, a Ni-Ce0.8Sm0.2O1.9 anode electrochemic...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2018-08-01
|
| Series: | Frontiers in Energy Research |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/article/10.3389/fenrg.2018.00087/full |
| _version_ | 1818187194484916224 |
|---|---|
| author | Kai Zhao Bok-Hee Kim M. Grant Norton M. Grant Norton Su Y. Ha |
| author_facet | Kai Zhao Bok-Hee Kim M. Grant Norton M. Grant Norton Su Y. Ha |
| author_sort | Kai Zhao |
| collection | DOAJ |
| description | Inert-substrate-supported tubular solid oxide fuel cells with multi-functional layers were fabricated in this work. The tubular single cells consisted of a porous yttria-stabilized zirconia inert-substrate supporting layer, a Ni anode current collecting layer, a Ni-Ce0.8Sm0.2O1.9 anode electrochemical layer, an yttria-stabilized zirconia/Ce0.8Sm0.2O1.9 bi-layer electrolyte, and a La0.6Sr0.4Co0.2Fe0.8O3−δ cathode. Thickness of the La0.6Sr0.4Co0.2Fe0.8O3−δ cathode layer could be varied from 2.5 to 25.0 μm by controlling the number of dip-coatings in the single cell fabrication process. Electrochemical performance of the tubular single cells was investigated as a function of cathode thickness. Area specific resistance and maximum power density of the single cell were significantly affected by the thickness of the cathode. Increasing the cathode thickness to 15 μm was effective in reducing the sheet resistance of the layer and the area specific resistance of the single cell. Further increasing the cathode thickness induced a higher electrode polarization loss, which originated from insufficient gas diffusion and transport processes. Therefore, the optimum thickness of the La0.6Sr0.4Co0.2Fe0.8O3−δ cathode layer was determined to be 15 μm. At 800°C, the tubular single cell with the optimum cathode thickness displayed the highest observed maximum power density of 559 mWcm−2 under the hydrogen/air operation mode. Additionally, the tubular single cell exhibited good thermal cycling stability between 800 and 25°C for five cycles. These results illustrate the advantages of this system for future applications of the inert-substrate-supported tubular single cells in repeated startup and shut down conditions. |
| first_indexed | 2024-12-11T23:07:09Z |
| format | Article |
| id | doaj.art-99cc5e7fd03d4a76a216c4b99981099f |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-12-11T23:07:09Z |
| publishDate | 2018-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-99cc5e7fd03d4a76a216c4b99981099f2022-12-22T00:46:54ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2018-08-01610.3389/fenrg.2018.00087405848Cathode Optimization for an Inert-Substrate-Supported Tubular Solid Oxide Fuel CellKai Zhao0Bok-Hee Kim1M. Grant Norton2M. Grant Norton3Su Y. Ha4Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, United StatesDivision of Advanced Materials Engineering, Chonbuk National University, Jeonbuk, South KoreaVoiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, United StatesSchool of Mechanical and Materials Engineering, Washington State University, Pullman, WA, United StatesVoiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, United StatesInert-substrate-supported tubular solid oxide fuel cells with multi-functional layers were fabricated in this work. The tubular single cells consisted of a porous yttria-stabilized zirconia inert-substrate supporting layer, a Ni anode current collecting layer, a Ni-Ce0.8Sm0.2O1.9 anode electrochemical layer, an yttria-stabilized zirconia/Ce0.8Sm0.2O1.9 bi-layer electrolyte, and a La0.6Sr0.4Co0.2Fe0.8O3−δ cathode. Thickness of the La0.6Sr0.4Co0.2Fe0.8O3−δ cathode layer could be varied from 2.5 to 25.0 μm by controlling the number of dip-coatings in the single cell fabrication process. Electrochemical performance of the tubular single cells was investigated as a function of cathode thickness. Area specific resistance and maximum power density of the single cell were significantly affected by the thickness of the cathode. Increasing the cathode thickness to 15 μm was effective in reducing the sheet resistance of the layer and the area specific resistance of the single cell. Further increasing the cathode thickness induced a higher electrode polarization loss, which originated from insufficient gas diffusion and transport processes. Therefore, the optimum thickness of the La0.6Sr0.4Co0.2Fe0.8O3−δ cathode layer was determined to be 15 μm. At 800°C, the tubular single cell with the optimum cathode thickness displayed the highest observed maximum power density of 559 mWcm−2 under the hydrogen/air operation mode. Additionally, the tubular single cell exhibited good thermal cycling stability between 800 and 25°C for five cycles. These results illustrate the advantages of this system for future applications of the inert-substrate-supported tubular single cells in repeated startup and shut down conditions.https://www.frontiersin.org/article/10.3389/fenrg.2018.00087/fullcathode thicknessinert substrate supported tubular cellsheet resistancepolarizationelectrochemical performancethermal cycling |
| spellingShingle | Kai Zhao Bok-Hee Kim M. Grant Norton M. Grant Norton Su Y. Ha Cathode Optimization for an Inert-Substrate-Supported Tubular Solid Oxide Fuel Cell Frontiers in Energy Research cathode thickness inert substrate supported tubular cell sheet resistance polarization electrochemical performance thermal cycling |
| title | Cathode Optimization for an Inert-Substrate-Supported Tubular Solid Oxide Fuel Cell |
| title_full | Cathode Optimization for an Inert-Substrate-Supported Tubular Solid Oxide Fuel Cell |
| title_fullStr | Cathode Optimization for an Inert-Substrate-Supported Tubular Solid Oxide Fuel Cell |
| title_full_unstemmed | Cathode Optimization for an Inert-Substrate-Supported Tubular Solid Oxide Fuel Cell |
| title_short | Cathode Optimization for an Inert-Substrate-Supported Tubular Solid Oxide Fuel Cell |
| title_sort | cathode optimization for an inert substrate supported tubular solid oxide fuel cell |
| topic | cathode thickness inert substrate supported tubular cell sheet resistance polarization electrochemical performance thermal cycling |
| url | https://www.frontiersin.org/article/10.3389/fenrg.2018.00087/full |
| work_keys_str_mv | AT kaizhao cathodeoptimizationforaninertsubstratesupportedtubularsolidoxidefuelcell AT bokheekim cathodeoptimizationforaninertsubstratesupportedtubularsolidoxidefuelcell AT mgrantnorton cathodeoptimizationforaninertsubstratesupportedtubularsolidoxidefuelcell AT mgrantnorton cathodeoptimizationforaninertsubstratesupportedtubularsolidoxidefuelcell AT suyha cathodeoptimizationforaninertsubstratesupportedtubularsolidoxidefuelcell |