Influence of characteristics of stabilized zirconia electrolyte on performance of cermet supported tubular SOFCs  

作　　者：LI Changjiu LI Chengxin XING Yazhe XIE Yingxin LONG Huiguo 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi''an Jiaotong University,Xi''an 710049,China

出　　处：《Rare Metals》2006年第z1期273-279,共7页稀有金属(英文版)

基　　金：The present project was supported by Foundation of China Education Ministry for Talented Young Scholar;Education Promotion Project;Doctoral Thesis Foundation of Xi'an Jiaotong University.

摘　　要：Ni-Al_(2)O_(3)cermet supported tubular SOFC was fabricated by thermal spraying.Flame-sprayed Al_(2)O_(3)-Ni cermet coating plays dual roles of a support tube and an anode current collector.4.5mol.%yttria-stabilized zirconia(YSZ)and 10mol.%scandia-stabilized zirconia(ScSZ)coatings were deposited by atmospheric plasma spraying(APS)as the electrolyte in present study.The electrical conductivity of electrolyte was measured using DC method.The post treatment was employed using nitrate solution infiltration to densify APS electrolyte layer for improvement of gas permeability.The electrical conductivity of electrolyte and the performance of single cell were investigated to optimize SOFC performance.The electrical conductivity of the as-sprayed YSZ and ScSZ coating is about 0.03 and 0.07 S·cm^(-1)at 1000℃,respectively.The ohmic polarization significantly influences the performance of SOFC.The maximum output power density at 1000℃increases from 0.47 to 0.76 W·cm^(-2)as the YSZ electrolyte thickness reduces from 100μm to 40μm.Using APS ScSZ coating of about 40μm as the electrolyte,the test cell presents a maximum power output density of over 0.89 W·cm^(-2)at 1000℃.

关 键 词：solid oxide fuel cells(SOFCs) plasma spraying yttria-stabilized zirconia(YSZ) scandia-stabilized zirconia(ScSZ) coating 

分 类 号：TG146.4[一般工业技术—材料科学与工程]