B位Mn掺杂Sr_2Fe_(1.5)Mo_(0.5)O_(6-δ)作为中温固体氧化物燃料电池阳极的性能

Performance of Mn-Doped Sr_2Fe_(1.5)Mo_(0.5)O_(6-δ) as the Anode of Intermediate Temperature Solid Oxide Fuel Cell

采用溶胶-凝胶燃烧法合成出Sr_2Fe_(1.4)Mn_(0.1)Mo_(0.5)O_(6-δ)(SFMn0.1M)材料,并将其作为中温固体氧化物燃料电池的阳极.表征了SFMn0.1M材料的晶体结构、微观形貌、元素价态、电导率和电化学性能.X射线衍射表明Mn取代后,SFMn0.1M依然保持了立方钙钛矿结构,扫描电子显微镜观察到其微观形貌为三维多孔结构.SFMn0.1M作为SOFCs阳极显示出优异的电化学性能,在800℃下SFMn0.1M的电导率为14.7S·cm^(-1),以SFMn0.1M为阳极材料组装单电池,H_2作为燃料,其最大功率密度在800,750,700和650℃下分别为565.2,385.2,303.9和141.2mW·cm^(-2).因此,SFMn0.1M在作为IT-SOFC阳极材料时表现出巨大的潜力.

In this paper,a material Sr2Fe1.5Mo0.5O6-δ（SFMn0.1M）was synthesized by a sol-gel combustion method and taken as anode materials for intermediate temperature solid oxide fuel cells（IT-SOFCs）.The crystal structure,microstructure,element valence,conductivity and electrochemical properties of SFMn0.1Mwere characterized.The results of X-ray diffraction（XRD）show that,Mndoped SFMn0.1Mstill possesses pure perovskite crystal structure and the 3Dinterconnected network microstructure composed of nano-particles.The results of electron microscope（SEM）scanning reveal the interconnected porous structure of SFMn0.1M.In addition,SFMn0.1M exhibits excellent electrochemical performance with the highest conductivity of 14.7S·cm^-1 at 800℃;and the peak power densities of single cells based on the SFMn0.1Manode can reach 565.2,385.2,303.9and 141.2mW·cm^-2 at 800,750,700and 650℃,respectively.All these results show that SFMn0.1Mmaterial is a promising anode for IT-SOFCs.