高温固体氧化物电解池钙钛矿型氧电极材料Ba_xSr_(1-x)Co_(0.8)Fe_(0.2)O_(3-δ)结构计算与性能研究  

Structure calculation and performance research of perovskite-type Ba_xSr_(1-x)Co_(0.8)Fe_(0.2)O_(3-δ) oxygen electrode for hydrogen production through high temperature solid oxide electrolyzer cells

作　　者：张文强[1] 于波[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：《中国科学：化学》2011年第6期1010-1016,共7页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(20803039);国家科技重大专项(ZX06901-020)资助

摘　　要：研究和开发高性能的钙钛矿型混合电导氧化物是目前高温固体氧化物电解池(SOEC)氧电极材料研究的热点.选择BaxSr1-xCo0.8Fe0.2O3-δ系列材料,通过对材料的容差因子、关口半径、晶格自由体积等计算,以及对平均键能、B位离子的变价能力、催化活性等方面的分析,确定了A位最佳配比.对优化出的Ba0.5Sr0.5Co0.8Fe0.2O3-δ材料的电化学性能进行了研究,并与自制的La0.2Sr0.8MnO3(LSM)氧电极材料进行了比较.结果表明:850℃下阳极极化阻抗(ASR)仅为0.07Ωcm2,远低于LSM;将其应用于SOEC氧电极进行高温电解制氢试验,产氢速率为相同条件下LSM的2.3倍,说明将Ba0.5Sr0.5Co0.8Fe0.2O3-δ用作SOEC阳极材料具有很好的应用前景.It is of great importance to improve the anodic performance with low polarization resistance for practicability of solid oxide electrolyzer cell（SOEC）technology.In this paper,the feasibility of novel conductive membrane BaxSr1-xCo0.8Fe0.2O3-δused as oxygen electrode of SOEC was studied from several aspects of the Goldschmidt tolerance factor,critical radius,lattice free volume,average bond energy,variable valence capability of B elements,and so on.A strategy for the systematic selection of oxygen electrode was explored and the optimum combination of the A site of BaxSr1-xCo0.8Fe0.2O3-δseries materials was selected out.Furthermore,the hydrogen production performance and the electrochemical property of Ba0.5Sr0.5Co0.8Fe0.2O3-δ（BSCF）anode were studied and compared with conventional LSM.The anodic polarization resistance（ASR）at 850℃was only 0.07？cm2,remarkably lower than the common used oxygen materials such as LSM.The hydrogen production rate of a SOEC single cell with BSCF as anode could reach as high as 310.7 mL cm ？2 h ？1 at 850℃and electrolysis voltage of 1.4 V,which showed that BSCF could be a very potentially promising candidate for the application of SOEC anode material.

关 键 词：高温固体氧化物电解池 核能制氢 氧电极 钙钛矿 

分 类 号：TM911.4[电气工程—电力电子与电力传动]