摘要
Sr-doped LaMnO_(3)(LSM)which is the firstgeneration cathode for solid oxide fuel cells(SOFC;)has been tailored with Zn ions,aiming to achieve improved protonation ability for proton-conducting SOFCs(H-SOFCs).The new Sr and Zn co-doped LaMnO_(3)(LSMZ)can be successfully synthesized.The first-principle studies indicate that the LSMZ improves the protonation of LSM and decreases the barriers for oxygen vacancy formation,leading to high performance of the LSMZ cathode-based cells.The proposed LSMZ cell shows the highest fuel cell performance among ever reported LSMbased H-SOFCs.In addition,the superior fuel cell performance does not impair its stability.LSMZ is stable against CO_(2),as demonstrated by both in-situ CO_(2)corrosion tests and the first-principles calculations,leading to good long-term stability of the cell.The Zn-doping strategy for the traditional LSM cathode with high performance and good stability brings back the LSM cathode to intermediate temperatures and paves a new way for the research on the LSM-based materials as cathodes for SOFCs.
Sr掺杂的LaMnO_(3)(LSM)是固体氧化物燃料电池(SOFC)的第一代阴极.为了提高其质子化能力从而应用于质子导体SOFC(H-SOFC),本研究成功合成了Zn和Sr共掺杂的LaMnO_(3)材料(LSMZ),即通过Zn离子调节LSM的性能.第一性原理研究表明,LSMZ提高了材料的质子化能力,而且降低了材料中氧空位的形成能,使LSMZ在电池应用中展现出较高的性能,是文献报道同类阴极在H-SOFC中的最大值.此外,良好的燃料电池性能并没有影响材料的稳定性.原位CO_(2)腐蚀测试和第一性原理计算表明LSMZ材料对于CO_(2)具有高稳定性,使LSMZ电池在工作状态下具有较好的长期稳定性.Zn掺杂策略将传统LSM阴极的高稳定性与高性能相结合,将LSM阴极带回到中温工作区间.
作者
Shuai Wu
Xi Xu
Xiaomei Li
Lei Bi
吴帅;许茜;李晓梅;毕磊(School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China;Department of Materials,Imperial College London,Prince Consort Road,London SW72BP,UK;Institute of Materials for Energy and Environment,College of Materials Science and Engineering,Qingdao University,Qingdao 266071,China)
基金
supported by the National Natural Science Foundation of China(51972183 and 51972128)
the Startup Funding for Talents at the University of South China。
