| 학회 |
한국화학공학회 |
| 학술대회 |
2010년 가을 (10/21 ~ 10/22, 대전컨벤션센터) |
| 권호 |
16권 2호, p.1677 |
| 발표분야 |
에너지 |
| 제목 |
Parametric study for solid oxide fuel cells |
| 초록 |
To enhance the performance of anode-supported solid oxide fuel cell (SOFC), an electrochemical model has been developed in this study. The Butler-Volmer equation, Ohm’s law and dusty-gas model are incorporated to predict the activation, ohmic and concentration overpotentials, respectively. The optimal cell microstructure and operating parameters for the best current-voltage (J-V) characteristics have been sought from the information of the exchange current density and gas diffusion coefficients. As the cell temperature rises, the activation and ohmic overpotentials decrease, whereas the concentration overpotential increases due to the considerable reduction of gas density at the elevated temperature despite the increased diffusion coefficient. Also, increasing the hydrogen molar fraction and operating pressure can further augment the maximum cell output. From the fact that there exists an optimum of electrode pore size and porosity for maximum cell power density, the graded electrode has newly been designed to effectively reduce both the activation and concentration overpotentials. The results exhibit 50% improved cell performance than the case with a non-graded electrode. |
| 저자 |
조동현, 전정환, 박기태, 황지원, 정현욱, 김성현
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| 소속 |
고려대 |
| 키워드 |
Silmulation; Ohmic; Activation; Concentration; Overpotential; Graded electrode; Performance fuel cell; SOFC
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| E-Mail |
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| 원문파일 |
초록 보기 |
