PMMA造孔剂对固体氧化物电解池制氢性能的影响  

Effect of PMMA Pore Former on Hydrogen Production Performance of Solid Oxide Electrolysis Cells

作　　者：于波[1] 张文强[1] 梁明德[1] 张平[1] 徐景明[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京102201

出　　处：《无机材料学报》2011年第8期807-812,共6页Journal of Inorganic Materials

基　　金：国家科技重大专项基金(2010ZX06901);国家自然科学基金(20803039)~~

摘　　要：针对目前常规高温固体氧化物电解池(SOEC)阴极材料水蒸气扩散阻力大、极化能量损失高和稳定性差的不足,本研究采用聚甲基丙烯酸甲酯(PMMA)造孔剂对SOEC阴极材料进行了微观结构调整和优化,以提高其电解过程制氢性能和耐候性.实验结果表明:采用PMMA造孔剂可以显著降低水蒸气的扩散阻力,提高SOEC的电解效率和制氢性能.当PMMA的添加量为10wt%时,阴极材料的孔隙率高达45%,孔形规整圆形,分布均匀,孔径约为10μm.微观结构改进后,阴极的电导率为6726 S/cm,运行稳定,具有较高的机械强度.当电解温度为850℃,电压1.3V时,与采用淀粉造孔剂的SOEC相比,采用PMMA造孔剂的SOEC在运行过程中水蒸气扩散阻抗降低50%,产氢率提高50%.To reduce the diffusion resistance,improve the energy efficiency and extend the life of solid oxide electrolysis cells（SOEC）,the porosity and microstructure optimization of SOEC cathode support layer were studied.Polymethyl methacrylate（PMMA）was added into the cathode as an alternative of starch for pore formation.The experi-mental results show that the porosity of cathode reaches 45% with conductivity of 6726 S/cm when the PMMA content is 10wt%.The round micro-pores formed by PMMA are well distributed with an average diameter of about 10 μm,which not only significantly reduce the gas diffusion resistance and increase the mechanical strength of cathode materials,but also improve largely the electrolysis efficiency,stability and hydrogen production performance of the SOEC.After the microstructure modification and optimization of cathode layer,the hydrogen production rate of SOEC using PMMA pore former can reach 175mL/（cm^2.h）,which is 1.5 times of the hydrogen production rate of starch.Also their steam diffusion resistance reduce 50% at 850℃ and 1.3V electrolysis voltage,which indicates that PMMA is a very promising candidate for the application of SOEC technology.

关 键 词：高温固体氧化物电解池 核能制氢 微观结构 阴极支撑层 扩散 

分 类 号：TQ174.758[化学工程—陶瓷工业]