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Cr effect on the durability of Pt-TM catalysts for PEMFCs

机译:对PEMFC的PT-TM催化剂耐久性的CR影响

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摘要

Pt-TM-Cr/C alloy catalysts were prepared using a polyol method to improve their durability through the addition of a small amount of Cr, which is expected to prevent dissolution of transition metals (TMs). H2PtCl6 center dot H2O, CoCl2 center dot 6H(2)O, Ni(NO3)(2)center dot 6H(2)O, and CrCl2 were used as precursors. X-ray diffraction was used to determine the compositions and sizes of the prepared electrocatalysts. The average sizes of the electrocatalyst particles were estimated to be 2-4 nm using the Scherrer formula. Transmission electron microscopy observations revealed that the nanoparticles were uniformly distributed on the carbon, i.e., Vulcan XC 72. The durability of the Pt-TM-Cr/C alloy catalysts was evaluated using a cell test and the durability test. According to the cell tests, Pt-TM(Co)-Cr (67 : 23 : 10)/C alloy catalysts are more durable than Pt-TM(Co)/C alloy catalysts. The stability tests showed that Cr prevents the dissolution of transition metals, which are integral to the durability of the electrode.
机译:使用多元醇方法制备PT-TM-Cr / C合金催化剂,以通过添加少量Cr来改善它们的耐久性,这预计将防止过渡金属(TMS)的溶解。 H2PTCL6中心点H2O,COCl2中心点6H(2)O,Ni(NO 3)(2)中心点6H(2)O和CRCL2用作前体。使用X射线衍射来确定制备的电催化剂的组合物和尺寸。使用Scherrer公式估计电催化剂颗粒的平均尺寸为2-4nm。透射电子显微镜观察显示,纳米颗粒均匀地分布在碳,即硫磺XC 72上。使用细胞试验和耐久性测试评估PT-TM-Cr / C合金催化剂的耐久性。根据细胞试验,PT-TM(CO)-CR(67:23:10)/ C合金催化剂比Pt-TM(CO)/ C合金催化剂更耐用。稳定性试验表明,CR防止过渡金属的溶解,这与电极的耐久性是一体的。

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  • 来源
    《RSC Advances》 |2015年第68期|共5页
  • 作者单位

    Korea Univ Dept Mat Sci &

    Engn Seoul 136701 South Korea;

    Korea Univ Dept Mat Sci &

    Engn Seoul 136701 South Korea;

    Korea Univ Dept Mat Sci &

    Engn Seoul 136701 South Korea;

    Korea Univ Dept Mat Sci &

    Engn Seoul 136701 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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