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《Journal of South China University of Technology(Natural Science Edition)》 2008-07
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Fabrication and Electrochemical Performance of Li_2SO_4-Based Composite Proton-Conducting Membrane

Zhong Li1 Zhu Bin1 Chuang Karl2(1.School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;2.Department of Chemical and Materials Engineering,University of Alberta,Edmonton T6G 2G6,Alberta,Canada)  
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 conductivity 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.
【Fund】: 广东省自然科学基金资助项目(07006531)
【CateGory Index】: TM911.4
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