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Fuel oxidation efficiencies and exhaust composition in solid oxide fuel cells

机译：固体氧化物燃料电池的燃料氧化效率和废气成分

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Solid oxide fuel cells (SOFCs) are electrochemical devices that rely on ion migration through a solid-state electrolyte to oxidize fuel and produce electricity. The present study employs Fourier transform infrared spectroscopy to quantify the exhaust of an SOFC operating with fuel flows of methane over Ni/YSZ cermet anodes and butane over Ni/YSZ and Cu/CeO2/YSZ cermet anodes. Data show that hydrocarbon fuels can participate in a variety of different reactions including direct electrochemical oxidation, various reforming processes, and surface-catalyzed carbon deposition. These findings have direct consequences for assessing the environmental impact of SOFCs in terms of the exhaust discharged from devices operating with common hydrocarbon fuel feeds. In the work presented below, a measure of fuel oxidation efficiency is found by comparing the partial pressure of CO2(P-CO2) in the SOFC exhaust to the partial pressure of CO ( P CO). The fuel anode combination with the largest P-CO2/P-CO ratio is the C4H10 over Cu/CeO2 combination (0.628 +/- 0.016). The CH4 over Ni cell type has the second highest ratio (0.486 +/- 0.023). The C4H10 over Ni cell type gives a ratio of 0.224 +/- 0.001. Attempts to balance the carbon content of the fuel feed and exhaust lead to predictions of SOFC fuel oxidation mechanisms.
机译：固体氧化物燃料电池（SOFC）是电化学装置，其依靠离子迁移通过固态电解质来氧化燃料并产生电能。本研究采用傅里叶变换红外光谱法来量化SOFC的排放，该燃料的甲烷流经Ni / YSZ金属陶瓷阳极，而丁烷流经Ni / YSZ和Cu / CeO2 / YSZ金属陶瓷阳极。数据表明，碳氢燃料可参与多种不同的反应，包括直接电化学氧化，各种重整过程和表面催化的碳沉积。这些发现对于评估SOFC的环境影响具有直接的后果，该SOFC对使用普通烃类燃料进料的设备排放的废气进行了评估。在下面介绍的工作中，通过将SOFC排气中的CO2（P-CO2）分压与CO（P CO）分压进行比较，可以找到一种衡量燃料氧化效率的方法。具有最大P-CO2 / P-CO比的燃料阳极组合是C4H10比Cu / CeO2组合（0.628 +/- 0.016）。 CH4超过Ni电池类型的比率第二高（0.486 +/- 0.023）。 C4H10与Ni电池的类型之比为0.224 +/- 0.001。试图平衡燃料进料和排气中的碳含量导致对SOFC燃料氧化机理的预测。

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