Pr掺杂Sm_(0.5)Sr_(0.5)CoO_(3)阴极的性能研究

Study on the performance of Pr-doped Sm_(0.5)Sr_(0.5)CoO_(3) cathode

固体氧化物燃料电池(SOFC)因能量转换效率高,绿色无污染而备受关注。研究发现,钙钛矿结构的Sm_(0.5)Sr_(0.5)CoO_(3-δ)(SSC)是电子-离子混合导体,具有良好的氧还原活性,以及电导率高、极化电阻低等优点。为了探究镧系元素Pr掺杂对SSC阴极性能的影响,采用溶胶-凝胶法制备Pr_(x)Sm_(0.5-x)Sr_(0.5)CoO_(3)(x=0.1,0.2,0.3,0.4,0.5)阴极粉体,对其进行一系列表征和电化学性能测试。电化学阻抗谱(EIS)测试表明,当Pr掺杂量为0.3时,PSSC-30阴极在550~750℃范围内的极化电阻均小于其他掺杂量;在700℃时,全电池的功率密度达到最大,为311.06mW/cm^(2)。

Solid oxide fuel cells(SOFCs)have attracted much attention due to their high energy conversion efficiency and green pollution-free.It is found that Sm_(0.5)Sr_(0.5)CoO_(3-δ)(SSC)with perovskite structure is an electron-ion mixed conductor,showing good oxygen reduction activity,high conductivity and low polarization resistance.In order to investigate the effect of lanthanide Pr doping on the performance of SSC cathode,the Pr_(x)Sm_(0.5-x)Sr_(0.5)CoO_(3)(x=0.1,0.2,0.3,0.4,0.5)cathode powders were prepared by sol-gel method,and their characterization and electrochemical performance were tested.The electrochemical impedance spectroscopy(EIS)test showed that when the Pr doping was 0.3,the polarization resistance of the PSSC-30 cathode was smaller than that of other doping amounts cathode in the range of 550~750℃.The power density of the full cell reached its maximum at 700℃,which was 311.06mW/cm^(2).