自蔓延高温合成SOFC阴极材料La_(0.7)Sr_(0.3)MnO_3

Self-Propagating High-Temperature Synthesis of La_(0.7)Sr_(0.3)MnO_3

设计了4类共9个化学反应,采用自蔓延高温合成的方法合成了固体氧化物燃料电池阴极材料La0.7Sr0.3MnO3.4个反应体系分别是:La2O3,SrCO3,Mn粉与氧化剂NaClO4或Ba(ClO4)2在空气中的反应;La2O3,SrCO3与Mn粉在氧气中的反应;LaCl3,SrCl2,MnCl2与氧化剂NaO2或Na2O2在空气中的反应;La(NO3)3,Sr(NO3)2,Mn粉与C3N6H6在空气中的反应.XRD和I.C.P分析表明:采用SHS法成功合成了菱方晶系(R3C)钙钛矿结构的La0.7Sr0.3MnO3粉末,其中大部分反应体系合成产物为单相La0.7Sr0.3MnO3.该方法能显著降低材料制备成本,有利于推动SOFC的实用化和产业化进程.

In order to reduce the production cost, a self-propagating high temperature synthesis ( SHS) technique was used to prepare the cathode materials of solid oxide fuel cells(SOFC). Four kinds of SHS reaction systems and nine reaction formulas were studied to prepare La_(0.7)Sr_(0.3)MnO_3. The four kinds of SHS reactions were reactions of La_2O_3,( SrCO_3) and Mn with NaClO_4 or Ba(ClO_4)_2 in air atmosphere; reactions of La_2O_3, SrCO_3 and Mn in pure oxygen atmosphere; reactions of LaCl_3, SrCl_2, MnCl_2 and NaO_2 or Na_2O_2 in air atmosphere, and reactions of La(NO_3)_3, Sr(NO_3)_2, Mn and C_3N_6H_6 in air atmosphere. The XRD analysis showed that most of the SHS products of the above-mentioned reactions were single-phase La_(0.7)Sr_(0.3)MnO_3. This method can dramatically reduce the cost of material preparation and promote the utilization and industrialization of SOFC.