不同燃料SOFC的理论电池电动势及其性能

doi:10.3969/j.issn.0438-1157.2013.07.048

化工学报 ›› 2013, Vol. 64 ›› Issue (7): 2664-2671.DOI: 10.3969/j.issn.0438-1157.2013.07.048

不同燃料SOFC的理论电池电动势及其性能

熊洁¹, 焦成冉², 韩敏芳³

1. 枣庄学院化学化工与材料科学学院, 山东枣庄 277160;
2. 枣庄学院机电工程学院, 山东枣庄 277160;
3. 中国矿业大学(北京)化学与环境工程学院, 煤气化燃料电池研究中心, 北京 100083

收稿日期:2012-10-31 修回日期:2013-03-18 出版日期:2013-07-05 发布日期:2013-07-05
通讯作者: 熊洁(1987- ),男,硕士研究生,助教
作者简介:熊洁(1987- ),男,硕士研究生,助教。
基金资助:
国家重点基础研究发展计划项目(2012CB215404)。

Theoretical electromotive force and performance of SOFC fed with different fuel gases

XIONG Jie¹, JIAO Chengran², HAN Minfang³

1. College of Chemistry Chemical Engineering and Material Science, Zaozhuang University, Zaozhuang 277160, Shandong, China;
2. School of Mechanical and Electronic Engineering, Zaozhuang University, Zaozhuang 277160, Shandong, China;
3. Union Research Center of Fuel Cell, School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China

Received:2012-10-31 Revised:2013-03-18 Online:2013-07-05 Published:2013-07-05
Supported by:
supported by the National Basic Research Program of China (2012CB215404).

摘要/Abstract

摘要： 以NH₃以及3% H₂O增湿的H₂、CH₄、C₃H₈和煤炭地下气化(underground coal gasification,UCG)气为燃料,用最小Gibbs自由能法计算平衡气体组分和理论电池电动势,并测试在NiO-GDC‖GDC‖Ba_0.9Co_0.7Fe_0.2Nb_0.1O_3-δ(B_0.9CFN)阳极支撑固体氧化物燃料电池(SOFC)中的电池开路电压、电池性能和长期稳定性。结果表明,以上述气体作燃料的SOFC热力学计算理论电动势均高于1.05 V,而由于GDC电解质在还原气氛下存在电子电导,导致碳氢燃料在NiO-GDC‖GDC‖B_0.9CFN阳极支撑电池中的开路电压略小。中低温下,碳氢燃料相对缓慢的动力学过程和GDC电解质快速的氧离子传输速率,使得以UCG气、CH₄和C₃H₈为燃料的电池实际积炭比理论预测少。以UCG气为燃料的SOFC在500、550、600和650℃的最高功率密度分别高达0.151、0.299、0.537和0.729 W·cm^-2,在0.6 V恒压放电120 h后性能没有明显衰减,且阳极表面无积炭产生,表明直接UCG气SOFC具有广阔的应用前景。

关键词: 固体氧化物燃料电池, UCG气, 热力学平衡, 电动势, 积炭

Abstract: The equilibrium species and theoretical electromotive force of cells fed with NH₃ and 3% H₂O humidified H₂,CH₄,C₃H₈ and underground coal gasification(UCG)gas on the basis of minimum Gibbs free energy were calculated,whilst the open circuit voltage(OCV),V-I characteristics and long-term stability of NiO-GDC‖GDC‖Ba_0.9Co_0.7Fe_0.2Nb_0.1O_3-δ(B_0.9CFN)anode-supported cells operated in above five fuels were evaluated.The results showed that direct utilization of hydrocarbon fuels in anode could achieve a desirable electromotive force (EMF)no less than 1.05 V,while the OCV for ceria-based cells was comparatively poorer due to the presence of electronic conductivity.Besides,the synergy effect between stagnant kinetics of hydrocarbons reforming and the relatively sufficient O^2- supply due to fast migration of oxide ions suppressed carbon deposition at low operating temperatures for ceria-based SOFC. Furthermore,the UCG gas fed cell exhibited peak power densities as high as 0.151,0.299,0.537 and 0.729 W·cm^-2,respectively at 500,550,600 and 650℃,and showed no evident performance decay and carbon deposition on anode after discharging at 600℃ under a constant voltage of 0.6 V for 120 h,thereby demonstrating UCG gas is a promising fuel for direct utilization in SOFC.

Key words: solid oxide fuel cell, UCG gas, thermodynamic equilibrium, electromotive force, carbon deposition

中图分类号:

O646
TM911.4

熊洁, 焦成冉, 韩敏芳. 不同燃料SOFC的理论电池电动势及其性能[J]. 化工学报, 2013, 64(7): 2664-2671.

XIONG Jie, JIAO Chengran, HAN Minfang. Theoretical electromotive force and performance of SOFC fed with different fuel gases[J]. CIESC Journal, 2013, 64(7): 2664-2671.

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不同燃料SOFC的理论电池电动势及其性能

Theoretical electromotive force and performance of SOFC fed with different fuel gases

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