固体氧化物燃料电池新型钙钛矿La0.9Ca0.1Fe0.9Nb0.1O3-δ阳极的制备及其性能研究  

Preparation and Electrochemical Performance of a Novel Perovskite Anode La_(0.9)Ca_(0.1)Fe_(0.9)Nb_(0.1)O_(3-δ) for Solid Oxide Fuel Cells

作　　者：赵晓虹 王勇[1] 刘立敏 李斌[1,2] 

机构地区：[1]东北林业大学理学院,黑龙江省阻燃材料分子设计与制备重点实验室,哈尔滨150040 [2]东北林业大学林业工程博士后流动站,哈尔滨150040

出　　处：《无机材料学报》2017年第11期1188-1194,共7页Journal of Inorganic Materials

基　　金：东北林业大学中央高校基金(2572015CB20);中国博士后基金(2015M571379);国家自然科学基金(21406033)~~

摘　　要：Ni-YSZ作为固体氧化物燃料电池(SOFCs)的传统阳极具有良好的催化性能,但存在碳沉积、抗氧化还原能力差及硫毒化等问题,因此钙钛矿型材料以其良好的催化活性及耐H_2S毒化能力而成为研究热点。为此,本工作开发出了一种新型的Nb掺杂Fe基钙钛矿阳极材料La_(0.9)Ca_(0.1)Fe_(0.9)Nb_(0.1)O_(3-δ)。Fe位引入Nb显著地提高了材料在高温还原气氛中的结构稳定性,而对材料的热膨胀行为影响很小,掺杂前后材料的热膨胀系数分别为11.67×10^(-6)K^(-1)和11.57×10^(-6)K^(-1)。掺入Nb提高了阳极材料在还原气氛中的电导率,该材料在800℃时氢气中的电导率为1.95 S/cm。测试结果表明,La_(0.9)Ca_(0.1)Fe_(0.9)Nb_(0.1)O)(3-δ)阳极在H_2和CO中均表现出优异的放电性能,在800℃时放电功率分别达到539和491 m W/cm^2,电池在CO中放电200 h性能无衰减,显示出很好的长期稳定性。研究表明La_(0.9)Ca_(0.1)Fe_(0.9)Nb_(0.1)O_(3-δ)是一种极具应用前景的新型钙钛矿阳极材料。The conventional Ni-YSZ anode as a cermet for solid oxide fuel cells（SOFCs） suffers from several shortcomings typically including low resistance to carbon coking, re-oxidation as well as sulfur poisoning. Perovskite anode as a potential substitute for Ni-YSZ anode has drawn much attention due to its impressive merits regarding carbon coking and re-oxidation resistance ability. In this study, a novel Nb-doped Fe-based perovskite anode candidate La_（0.9）Ca_（0.1）Fe_（0.9）Nb_（0.1）O_（3-δ） was developed in which the addition of Nb greatly enhanced the structure stability in reducing atmosphere while the thermal expansion behavior was subtly influenced. The thermal expansion coefficient of the novel Nb-doped Fe-based perovskite anode changed from 11.67×10^（-6）K^（-1） to 11.57×10^（-6） K^（-1） after Nb doping while the electrical conductivity was greatly improved as well. At 800℃, the electrical conductivity of the novel Nb-doped Fe-based perovskite anode in H2 reached up to 1.95 S/cm. The cell with La_（0.9）Ca_（0.1）Fe_（0.9）Nb_（0.1）O_（3-δ） anode pre-pared by infiltration method presented high electrochemical performance. The maximal power densities in H_2 and CO at 800℃ were up to 539 and 491 m W/cm^2, respectively. It is remarkable that the cell has impressive long-term stability in pure CO at 800℃ for as long as 200 h. The results indicate that the perovskite La_（0.9）Ca_（0.1）Fe_（0.9）Nb_（0.1）O_（3-δ）material is electrochemically active for both H_2 and CO oxidation which can be taken as a promising anode candidate for SOFCs practical applications.

关 键 词：固体氧化物燃料电池 钙钛矿结构 湿法浸渍 阳极 

分 类 号：TQ174[化学工程—陶瓷工业]