作　　者： ; ;

机构地区： 华南理工大学化学与化工学院

出　　处： 《华南理工大学学报（自然科学版）》 2008年第7期1-5,共5页

摘　　要： 制备了以Li2SO4为基体、A l2O3为填充物的复合质子传导膜.采用电化学阻抗波谱分析法(EIS)研究了掺杂不同组分(Li2WO4或Na2SO4)以及掺杂不同比例时制备的不同厚度的复合质子传导膜的离子(电)传导率.分析结果表明,在Li2SO4中掺杂一定比例的Li2WO4或Na2SO4均可提高膜的离子传导率,Li2WO4对复合膜性能的影响优于Na2SO4.扫描电镜(SEM)分析显示,掺杂Li2WO4的复合膜结构更加致密和紧凑.实验结果表明,由Li2SO4、Li2WO4和A l2O3制备的复合膜的适宜组成为75%Li2SO4/Li2WO4混合物(Li2SO4与Li2WO4摩尔比为9∶1)+25%A l2O3,其离子传导率在600,650,700和750℃时分别高达0.16,0.38,0.46和0.52S/cm,适宜的膜厚为0.8mm.文中还研究了以H2S为燃料、复合Mo-N i-S为阳极、复合Li2SO4为质子传导膜、复合N iO为阴极、空气为氧化剂的单电池的电化学性能,发现Li2SO4+Li2WO4+A l2O3复合膜的电化学性能较优. Composite proton-conducting membranes with Li2SO4 as the substrate and with Al2O3 as the packing were fabricated, and the electrochemical impedance spectroscopy （EIS） was employed to investigate the ion con ductivity of the composite membranes with different components （ Li2WO4 or Na2SO4 ） , dosages and thicknesses. Analytical results indicate that the doping of Li2WO4 or Na2SO4 with suitable dosage may increase the ion conductivity and improve the performance of the membrane, especially the doping of Li2WO4. SEM photographs show that the doping of Li2WO4 helps to improve the integrity more greatly. Experimental results indicate that, with a suitable composition of Li2SO4-based composite membranes, namely 75% Li2SO4/Li2WO4 mixture （with a Li2SO4-to- Li2WO4 molar ratio of 9：1 ） ＋25% Al2O3 , the ion conductivities of the membrane respectively reach 0. 16,0. 38, 0. 46 and 0. 52 S/cm at 600, 650, 700 and 750 ℃ , and the suitable membrane thickness is 0. 8 mm. Moreover, a single fuel cell with the configuration of H2S ＋ composite Mo-Ni-S anode ＋ Li2SO4-based composite proton-conducting membrane ＋ NiO-based composite cathode was fabricated, and the corresponding electrochemical performances were also investigated. The results show that the fuel cell of composite membrane with Li2SO4 ＋ Li2WO4 ＋ Al2O3 is of the most excellent performances.

关 键 词： 质子传导膜 燃料电池 电解质 硫化氢 电化学性能

领　　域： [电气工程] [理学] [理学]