摘要
固体氧化物燃料电池(SOFC)可以通过阳极重整反应直接利用碳氢燃料,然而吸热的重整反应导致Ni-YSZ阳极存在很大的温度梯度。利用Ti部分替代催化剂Ni,降低催化强度,控制重整反应合理进行,可以得到合适的温度梯度等特性。利用全三维数学模型,量化研究了以Ti部分替代Ni-YSZ阳极中Ni的SOFC性能,在不同Ni含量情况下,得到温度场、组分分布和输出电压等分布情况。可以看出,在计算工况下,当Ni含量>40%时,最大温度差和Ni含量几乎呈线性关系,当Ni含量<40%时,最大温度差降低幅度增大。相同摩尔分数的甲烷在阳极中出现的位置和Ni的含量几乎呈线性变化,而最大氢气摩尔分数随着Ni含量的降低而降低,降幅逐渐增加。随着Ni含量的降低,输出电压随之降低,降幅逐渐增大。
Solid oxide fuel cell（SOFC） can directly use a number of carbon hydrogen（such as natural gas,etc.） over Ni-YSZ anode through steam reforming reaction.However,endothermic steam reforming reaction could result in larger temperature gradient in the cell.Doping Ti to partially instead Ni in Ni-YSZ anode may reduce catalytic characteristics in order to obtain the proper temperature distribution.In this study,based on fully three-dimensional calculation models,the performance of Ni-YSZ anode partially doping Ti was investigated.From the results,under all calculating conditions,when Ni content is more than 40%,the difference between max-and min-temperature in anode is linear with the variation of Ni content.However,the decrement of temperature difference increases when Ni content is less than 40%.On the other hand,the location of the same molar fraction of methane is nearly linear with variation of Ni content.Nevertheless,the max molar fraction of hydrogen decreases with reducing of Ni content,but the decrement of max molar fraction enhances.With the decrement of Ni content,output voltage reduces,and the decrement of output voltage enhances with the reduction of Ni content.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第4期655-658,共4页
Journal of Functional Materials
基金
国家重点基础研究发展计划(973计划)资助项目(2007CB210102)
上海市科委科技攻关计划资助项目研究(08DZ1200102)
