非对称结构质子电解质微管中温燃料电池性能  

Properties of Asymmetric Micro-tubular IT-SOFCs Based on Proton Conducting Electrolyte

作　　者：陈长城 Ben H RAINWATER 丁冬 白耀辉[4] 张驰[1] CHEN Changcheng;Ben H RAINWATER;DING Dong;BAI Yaohui;ZHANG Chi(School of Science,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA;Energy and Environmental Science and Technology,Idaho National Laboratory,Idaho Falls,ID 83415,USA;School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]西安建筑科技大学理学院,陕西西安710055 [2]佐治亚理工学院材料科学与工程学院,佐治亚州亚特兰大30332 [3]爱达荷州国家实验室能源与环境科学技术实验室,爱达荷州爱达荷福尔斯83415 [4]华南理工大学化学与化工学院,广东广州510641

出　　处：《青岛科技大学学报（自然科学版）》2021年第3期45-53,61,共10页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：西安市科技计划高校人才服务企业项目(2019217414GXRC010CG011-GXYD10.2);陕西省体育局体育科研课题常规项目(2019147);国家大学生创新创业训练计划项目(20190703055)。

摘　　要：采用相转化方法,以质子导体BaZr0.1Ce0.7Y0.1Yb0.1O3-δ(BZCYYb)材料为电解质,制备了阳极支撑微管中温固体氧化物燃料电池。电池结构为Ni-BZCYYb|BZCYYb|La0.75-Sr0.25-MnO3-δ-Sm0.2Ce0.8O2-δ,阳极、电解质和阴极的厚度分别为200、12和10μm。获得了"海绵状微孔电极|均匀多孔功能层"不对称孔结构。以加湿氢气(3%(体积分数),H2O,0.03 L·min^(-1),99.99%)为燃料、空气为氧化剂进行电化学阻抗谱、电流-电压和功率密度测试,电池表现出优异的电化学性能,峰值功率密度在750、700、650和600℃分别达到1.01、0.89、0.75和0.58 W·cm^(-2)。Ni-BZCYYb阳极和LSM-SDC阴极的浓度极化电阻在750~600℃仅为0.014~0.019Ω·cm2。分别在0.5和0.7 V恒定电压,600和750℃进行了120 h长期稳定性试验,BZCYYb电解质具有良好的稳定性。电池截面微结构显示,BZCYYb电解质致密、无裂纹,电极具有非对称海绵状微孔,非常有利于形成三相界面,进而加速质子输运及反应。In this work,proton conducting anode-supported micro-tubular SOFCs with BaZr0.1Ce0.7Y0.1Yb0.1O3-δ(BZCYYb)as the electrolyte have been fabricated via phase-inversion process.Typical micro-tubular cell is in the Ni-BZCYYb|BZCYYb|La0.75Sr0.25MnO3-δ-Sm0.2-Ce0.8O2-δconfiguration consisting of anode,electrolyte and cathode with thickness of 200,12 and 10μm,respectively.The"sponge-like micro-pores electrode|homogeneous porous functional layer"asymmetric structure is obtained.Micro-tubular SOFCs show excellent electrochemical performance,the peak power densities are 1.01,0.89,0.75 and 0.58 W·cm^(-2) at 750,700,650 and 600℃,respectively,with humidified hydrogen(3%(Volume fraction)H2O,0.03 L·min^(-1),99.99%)as fuel and ambient air as oxidant.The concentration polarization values of 0.014—0.019Ω·cm2 are obtained at 750—600℃,characterized by AC impedance spectroscopy.Further,significant performance enhancement is observed during long-term stability test at 600 and 750℃under constant voltage of 0.5 and 0.7 V over 120 h,respectively,which indicates excellent stability of BZCYYb under fuel cell operating condition.SEM exhibit dense,crack-free BZCYYb electrolyte film and with micro sponge-like pores electrodes,which is very beneficial to the formation of three-phase interface,thus accelerating the proton transport and reaction.

关 键 词：相转化 燃料电池 电解质 浓度极化 交流阻抗谱 

分 类 号：TM911.4[电气工程—电力电子与电力传动]