带电子空穴传导的H-SOFC电化学模型与电池性能  

Electrochemical model for proton conducting solid oxide fuel cell with electron hole conduction and cell performance

作　　者：李会平[1] 李明 LI Huiping;LI Ming(Department of Inorganic Materials,East China University of Science and Technology,Shanghai,200237,China;College of Chemistry and Chemical Engineering,Wuhan Textile University,Wuhan,Hubei Province,430073,China)

机构地区：[1]华东理工大学无机材料系,上海200237 [2]武汉纺织大学化学与化工学院,湖北武汉430073

出　　处：《电池工业》2023年第5期246-252,共7页Chinese Battery Industry

摘　　要：通过应用电荷有效电导率概念,构建了一个模型来分析柱塞流动时带电子空穴传导的质子导体固体氧化物燃料电池的电化学性能,并进行了理论计算。探讨了输出电流密度、电池温度和电解质厚度等影响。研究结果表明,与纯质子导体H-SOFC相比,由于漏电作用,带电子空穴传导的H-SOFC有更低的开路电压,但其主要电势损失仍然是由电解质的欧姆极化损失和电极的活化极化损失引起的。漏电主要发生在小的输出电流情况下,即接近开路状态。此外,电池温度越高、电解质越薄,漏电现象越严重。为了提高能源利用效率并考虑漏电行为,电池应在较小的外部电流密度和适中的温度下工作。此外,电解质厚度也不宜太薄。An electrochemical model of proton conducting solid oxide fuel cell with electron hole conduction for plug flow within gas channels was given by application of effective electron hole conductivity.And calculations have been carried out on computer.The effects of external current density,operating temperature,and electrolyte thickness have been studied.The calculation results show that the H-SOFC with electron hole conduction has lower open circuit voltage due to current leakage,compared with H-SOFC with pure proton conduction.And ohmic loss and activation loss are still the major losses.Current leakage mainly takes place when external current density is small,i.e.close to the state of open circuit.The higher the operating temperature,the thinner the electrolyte,the worse the current leakage.From the point of energy utility view,combining with current leakage,the cell is suitable for working at the region with relatively small external current density and moderate operating temperature.And the electrolyte thickness should not be too thin.

关 键 词：电化学模型 H-SOFC 电子空穴传导 电池特性 

分 类 号：TM911.4[电气工程—电力电子与电力传动]