SOEC阳极浓差过电势的影响因素  

Factors influencing anode concentration overpotentials in SOEC

作　　者：王靖[1] 张勇[1] 邓长生[1] 

机构地区：[1]清华大学核能与新能源研究院,新型陶瓷和精细工艺国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2015年第2期203-207,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家科技重大专项资助项目(2010ZX06901-020)

摘　　要：该文基于电荷传输与质量传递过程,充分考虑三相界面的影响因素,改进了原有的固体氧化物电解池(SOEC)阳极浓差过电势模型,所建立的新模型获得了实验验证。根据阳极结构参数及电解池运行条件,对阳极浓差过电势的影响进行了系统分析。研究表明:增大阳极孔隙率和孔径,增大阳极表面的氧分压都能够减小阳极浓差过电势,而增加扩散层厚度则不能降低阳极浓差过电势。The charge transfer and mass transfer mechanisms in solid oxide electrolysis cells （SOEC） were modeled including the effect of the three phase boundary length on the anode concentration overpotentlal. The numerical results agree well with experimental data. The effects of the anode porosity, the pore radius and the diffusion layer thickness were analyzed. Further parametric analyses showed the effects of an oxygen partial pressure on the anode concentration overpotential. The results show that increased anode porosity and pore radius both reduce the concentration overpotential. However, the increase diffusion layer thickness increased the concentration overpotential. The oxygen partial pressure can be increased to reduce the anode overpotential. The model can be used to analyze anode designs and adjust the operation conditions to improve anode performance.

关 键 词：固体氧化物电解池(SOEC) 阳极 浓差过电势 

分 类 号：TG174.75[金属学及工艺—金属表面处理]