Zirconium oxide-based compounds as non-Pt cathode for polymer electrolyte fuel cell
Zirconium oxide-based compounds as non-Pt cathode for polymer electrolyte fuel cell
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DOI：
10.5796/electrochemistry.79.340
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发表时间：
2011-05
期刊：
影响因子：
2.5
通讯作者：
K. Ukita;A. Ishihara;Y. Ohgi;K. Matsuzawa;S. Mitsushima;K. Ota
中科院分区：
文献类型：
--
作者：
K. Ukita;A. Ishihara;Y. Ohgi;K. Matsuzawa;S. Mitsushima;K. Ota
研究了碳氮化锆不发生部分氧化的氧化锆基化合物作为聚合物电解质燃料电池的非铂阴极。采用溶液沉淀法制备了氧化锆基化合物，并对其进行了不同温度的热处理。在X-射线衍射图中，随着温度的升高，四方相ZrO_2峰减少，而单斜相ZrO_2峰增加。在1000°C下热处理的样品的氧还原反应（ORR）的起始电位达到相对于RHE的0.90V，表明样品具有限定的ORR活性。从XRD结果可以解释ORR活性的增加是由于ZrO 2从四斜晶系转变为单斜晶系而导致的Zr和/或氧空位的增加。
Zirconium oxide-based compounds without partial oxidation of zirconium carbonitride were investigated as nonplatinum cathode for polymer electrolyte fuel cell. Zirconium oxide-based compounds were prepared by solutionprecipitation method and heat-treated at different temperature. In X-ray diffraction patterns tetragonal ZrO2 peaks decreased whereas monoclinic ZrO2 peaks increased with increasing temperature. Onset potential for oxygen reduction reaction (ORR) of the specimen heat-treated at 1000°C reached 0.90 V vs. RHE, indicating that the specimen had defi nite ORR activity. The increase of ORR activity may be explained by the increase of Zr and / or oxygen vacancies due to the transformation of ZrO2 from tetragonal to monoclinic structure from the XRD results.