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IL-TEM investigations on the degradation mechanism of Pt/C electrocatalysts with different carbon supports

机译：IL-TEM研究不同碳载体的Pt / C电催化剂的降解机理

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摘要

Utilizing our recently developed method of identical location transmission electron microscopy (IL-TEM) in combination with electrochemical surface area determination, the degradation behavior of different carbon supported Pt catalysts for polymer electrolyte membrane fuel cells (PEMFCs) is investigated. Two different Pt based catalysts supported on a low surface area (LSA) carbon are compared to a Pt catalyst with standard high surface area (HSA) carbon support. One of the LSA carbon supports is of conventional type, while the other is modified by a transition metal. Relative to the standard, both catalysts with LSA carbon support exhibit improved degradation behavior in terms of loss in active surface area upon accelerated stress tests. The catalyst with transition metal modified carbon support thereby exhibits by far superior improvements. The characterization of the bare carbon supports indicates that the observed differences between both catalysts with LSA carbon support are not related to the resistance of the support to complete oxidation to carbon dioxide. Instead, the IL-TEM results reveal that the improved properties of the catalyst with transition metal modified support are due to a stabilization of the Pt particles attached to the support. Particle detachment thus can be drastically reduced and the degradation is limited to a migration and coalescence or sintering mechanism.
机译：利用我们最近开发的相同位置透射电子显微镜（IL-TEM）方法和电化学表面积测定方法，研究了用于聚合物电解质膜燃料电池（PEMFC）的不同碳载Pt催化剂的降解行为。将两种不同的负载在低表面积（LSA）碳上的基于Pt的催化剂与具有标准高表面积（HSA）碳载体的Pt催化剂进行了比较。 LSA碳载体之一是常规类型，而另一种则用过渡金属改性。相对于该标准，两种具有LSA碳载体的催化剂在加速应力测试中就活性表面积的损失而言均表现出改善的降解性能。具有过渡金属改性的碳载体的催化剂因此表现出非常优异的改进。裸碳载体的表征表明，具有LSA碳载体的两种催化剂之间观察到的差异与载体完全氧化成二氧化碳的耐受性无关。相反，IL-TEM结果显示具有过渡金属改性的载体的催化剂的改进性能归因于附着在载体上的Pt颗粒的稳定化。因此，可以大大减少颗粒的脱离，并且降解仅限于迁移，聚结或烧结机理。

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  • 来源
    《Energy & environmental science》 |2011年第1期|p.234-238|共5页
  • 作者

    Katrin Hartl; Marianne Hanzlik; Matthias Arenz;

  • 作者单位

    Lehrstuhl Physikalische Chemie, Technische Universitdt Munchen, Lichtenbergstr. 4, D-85748 Garching, Germany ,Department of Chemistry, CS06, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen 0, Denmark;

    Zentrum fur Elektronenmikroskopie, Technische Universitat Munchen, Lichtenbergstr. 4, D-85748 Garching, Germany;

    Department of Chemistry, CS06, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen 0, Denmark;

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