Insight into cathode microstructure effect on the performance of molten carbonate fuel cell
| Autor: | Karol Cwieka, Tomasz Wejrzanowski, Graeme John Oliver, Samih Haj Ibrahim, Pawel Sobczak, Aleksandra Lysik, Jakub Skibinski |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Capillary action Energy Engineering and Power Technology 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Cathode 0104 chemical sciences Cathodic protection law.invention Chemical engineering law Specific surface area Molten carbonate fuel cell Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Triple phase boundary |
| Zdroj: | Journal of Power Sources. 491:229562 |
| ISSN: | 0378-7753 |
| Popis: | This paper deals with the effect of pore size distribution within the cathode on the performance of molten carbonate fuel cells. The X-ray tomography images of four materials are used to create 3D geometrical models of the cathodes pore structure so that the modeling takes into account the actual variations in pore size of the real materials. The simulation includes the cathode infiltration process by the liquid electrolyte which is governed by capillary action. This allows one to quantify the triple phase boundary (cathode/electrolyte/gas) density which is commonly viewed as providing active sites for cathodic reactions. It has been found that this parameter does not correlate well with the maximum power density of the cell. On the other hand, increasing the specific surface area of the gas/electrolyte interface correlates well with higher cell performance. Following our in-depth modeling and analysis we postulate that the dominant mechanism, when larger pores are introduced by the addition of porogens, is the creation of continuous pathways for the transport of gases to come into contact with the cathode surface through the thin film of electrolyte. |
| Databáze: | OpenAIRE |
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