首页> 外文期刊>Journal of Sol-Gel Science and Technology >Physical and electrochemical properties of (La_(0.3)Sr_(0.7))_(0.93)TiO_(3-δ) synthesized by Pechini method as an anode material for solid oxide fuel cells
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Physical and electrochemical properties of (La_(0.3)Sr_(0.7))_(0.93)TiO_(3-δ) synthesized by Pechini method as an anode material for solid oxide fuel cells

机译:Pechini方法合成的(La_(0.3)Sr_(0.7))_(0.93)TiO_(3-δ)作为固体氧化物燃料电池阳极材料的物理和电化学性质

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The lanthanum strontium titanate (LST) has to be calcined at significantly high temperature (above 1,300 °C) to obtain its pure perovskite structure when synthesized by conventional solid-state method, which is main reason for reducing active surface area. In this study, A-site deficient (La_(0.3)Sr_(0.7))_(0.93)TiO3 was synthesized by Pechini method. Although the prepared powders were calcined at 600 °C, the pure perovskite structure can be obtained without any secondary phase such as TiO2. Moreover, the porosity and surface area are 6 times and one order of magnitude higher in the LST powders synthesized by Pechini method than in the powders synthesized by solid-state method. Based on these results, the LST electrode (Pechini) leads to two times lower electrode resistance than the LST electrode (solid-state). Thus, the LST powders synthesized by Pechini can contributes to saving the energy needed for calcination process as well as increasing the porosity and active surface area, enhancing physical and electrochemical properties in SOFC anode.
机译:当通过常规固态方法合成时,钛酸镧锶锶(LST)必须在相当高的温度(1300℃以上)下煅烧以获得其纯钙钛矿结构,这是减小活性表面积的主要原因。本研究采用Pechini法合成了A位缺陷型(La_(0.3)Sr_(0.7))_(0.93)TiO3。尽管将制备的粉末在600°C下煅烧,但可以获得纯钙钛矿结构,而没有任何二级相(例如TiO2)。而且,与通过固态方法合成的粉末相比,通过Pechini方法合成的LST粉末的孔隙率和表面积为6倍并且高一个数量级。基于这些结果,LST电极(Pechini)导致的电极电阻是LST电极(固态)的两倍。因此,由Pechini合成的LST粉末可有助于节省煅烧过程所需的能量,并增加孔隙率和活性表面积,增强SOFC阳极的物理和电化学性能。

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