Fuel cells with H3PW12O40 · 29H2O as solid electrolyte
Fuel cells with H3PW12O40 · 29H2O as solid electrolyte
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以H3PW12O40·29H2O为固体电解质的燃料电池
DOI：
10.1016/s0360-3199(96)00222-4
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发表时间：
1997
影响因子：
7.2
通讯作者：
N. Giordano
中科院分区：
文献类型：
--
作者：
P. Staiti;S. Hocevar;N. Giordano
以磷钨酸（PWA）为固体电解质，在室温下对H2 O2燃料电池进行了电化学活性测试。遵循两种不同的程序来制备电解质层。一种方法是将硅聚合物的前体与PWA的结晶粉末在玛瑙研钵中混合，并将糊状物涂在玻璃表面或电极表面上;聚合反应发生在已经形成的层上。得到了一种复合弹性材料，该材料将酸截留在聚合物的孔中。另一个程序包括用PWA的浓缩溶液浸渍惰性多孔材料较长时间，以在连续干燥后获得平坦层。通过这种方法得到了一种刚性和不可变形的多孔基体增强材料。质子内阻高是复合电解质层燃料电池电化学性能差的主要原因。此外，聚合物骨架在电池的工作条件下是不稳定的。在0.2A/cm 2下，由70wt%的PWA和30wt%的有机硅聚合物形成的电解质层获得了0.075W/cm 2的最大功率密度。采用第二种方法制备的含玻璃微纤维的增强电解质层获得了较好的电化学燃料电池性能。这可以总结为分别在0.6和0.33 V的电池电势下的0.45和2.0 A/cm 2的电流密度，在1.8 A/cm 2下的0.738 W/cm 2的功率密度和0.058 V/decade的塔菲尔斜率。
Electrochemical activity tests have been performed on a fuel cell fed with H2O2at room temperature utilizing phosphotungstic acid (PWA) as solid electrolyte. Two different procedures were followed to prepare the electrolyte layers. One consisted of mixing the precursor of a silicon polymer with the crystalline powder of the PWA in an agate mortar and spreading the paste on a glass surface or on the surface of an electrode; the polymerization occurred with the layer already formed. A composite elastic material which held the acid entrapped in the pores of the polymer was obtained. The other procedure consisted of impregnating an inert porous material with a concentrate solution of PWA, for a longer time, to obtain a flat layer after successive drying. A stiff and undeformable material reinforced by the porous matrix was obtained by this method. Poor fuel cell electrochemical performances were obtained with the composite electrolyte layer principally due to the high protonic internal resistance. Moreover, the polymeric skeleton was unstable under the working conditions of the cell. Maximum power density of 0.075 W/cm2was obtained at 0.2 A/cm2with the electrolyte layer formed by 70 wt% of PWA and 30 wt% of silicone polymer. Better electrochemical fuel cell performance was obtained with the reinforced electrolyte layer containing glass microfibers prepared by the second method. This can be summarized in current density of 0.45 and 2.0 A/cm2at cell potential of 0.6 and 0.33 V, respectively, power density of 0.738 W/cm2at 1.8 A/cm2and a Tafel slope of 0.058 V/decade.