[논문]Performance of Solid Oxide Fuel Cells with Direct Internal Reforming of Methane

Kim, Young Jin; Lim, Hyung-Tae

doi:10.4191/kcers.2015.52.5.325

Performance of Solid Oxide Fuel Cells with Direct Internal Reforming of Methane 원문보기

한국세라믹학회지 = Journal of the Korean Ceramic Society, v.52 no.5, 2015년, pp.325 - 330

Kim, Young Jin (School of Materials Science and Engineering, Changwon National University) , Lim, Hyung-Tae (School of Materials Science and Engineering, Changwon National University)

Abstract ▼ AI-Helper

Performance of solid oxide fuel cells (SOFCs), in comparison with that under hydrogen fuel, were investigated under direct internal reforming conditions. Anode supported cells were fabricated with an Ni+YSZ anode, YSZ electrolyte, and LSM+YSZ cathode for the present work. Measurements of I-V curves and impedance were conducted with S/C (steam to carbon) ratio of ~ 2 at $800^{\circ}C$. The outlet gas was analyzed using gas chromatography under open circuit condition; the methane conversion rate was calculated and found to be ~ 90% in the case of low flow rate of methane and steam. Power density values were comparable for both cases (hydrogen fuel and internal steam reforming of methane), and in the latter case the cell performance was improved, with a decrease in the flow rate of methane with steam, because of the higher conversion rate. The present work indicates that the short-term performance of SOFCs with conventional Ni+YSZ anodes, in comparison with that under hydrogen fuel, is acceptable under internal reforming condition with the optimized fuel flow rate and S/C ratio.

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Theoretically, an equivalent power density could be expected in comparison with hydrogen if CH₄was supplied by merely about 1/4 of H₂ flow rate. Based on such assumption, tests were conducted with the flow rate of CH₄ being set at approximately 1/4 of the hydrogen flow rate upon internal reforming. Supply of CH₄ together with CO₂ for internal reforming was implemented by mixture gas (CH₄ 80%, CO₂ 20%), the ratio of which was set to similarly match the refined biogas ratio.

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2MnO₃₋_δ) + YSZ and Current Collector(CC) of LSM were screen printed onto the surfaces of the sintered electrolyte, which were then heattreated at 1170℃ and 1160℃, respectively. The fabricated cell was of a button type with a total diameter of 25 mm and a cathode diameter of 14 mm. The overall cell fabrication process is indicated in Fig.

참고문헌 (16)

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Performance of Solid Oxide Fuel Cells with Direct Internal Reforming of Methane 원문보기

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Performance of Solid Oxide Fuel Cells with Direct Internal Reforming of Methane 원문보기

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