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首页> 外文会议>Seminar on New Trends in Research of Energetic Materials;NTREM '10 >Novel nano-scaled electrocatalysts for hydrogen evolution with reduced loading of precious metals
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Novel nano-scaled electrocatalysts for hydrogen evolution with reduced loading of precious metals

机译：新型的纳米级电催化剂，用于氢气释放，减少了贵金属的负载

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The aim of this work was to reduce the loading of precious metals in electrodes for hydrogen evolution. The investigated electrocatalysts contain mixed metallic phase (20% Pt or Ru and the rest 80% Co), TiO_2 and activated multiwalled carbon nanotubes (MWCNTs). For comparison, catalysts with pure metallic phase were prepared (Ru, Pt, Co).Structural characterization was performed by XRD, TEM, and FTIR methods. It was shown that Co and Ru particles are very small, near 2 nm, while Pt near 12 nm. Pt particles in the mixed electrocatalysts have decreased up to 3-4 nm.Pure and mixed Ru-systems have shown the best performances, as result of the very small particles, i.e. high developed surface area of the active catalytic phase. In the Pt-based systems, the catalyst with mixed CoPt metallic phase (only 20%Pt) has showed very close catalytic activity to the corresponding catalyst with pure Pt metallic phase (100% Pt). This is result of significantly smaller particle size of Pt and Co in the mixed metallic phase related to the particle size of pure Pt phase. The smaller amount of Pt was compensated with considerably higher surface area of the active catalytic centers.
机译：这项工作的目的是减少电极中用于析氢的贵金属的负载。研究的电催化剂包含混合金属相（20％Pt或Ru，其余80％Co），TiO_2和活性多壁碳纳米管（MWCNT）。为了进行比较，制备了具有纯金属相的催化剂（Ru，Pt，Co）。 结构表征是通过XRD，TEM和FTIR方法进行的。结果表明，Co和Ru粒子非常小，接近2 nm，而Pt接近12 nm。混合电催化剂中的Pt颗粒减少到3-4 nm。 由于非常小的颗粒，即活性催化相的高形成的表面积，纯的和混合的Ru系统已显示出最佳的性能。在基于Pt的系统中，具有混合CoPt金属相（仅20％Pt）的催化剂显示出与相应的具有纯Pt金属相（100％Pt）的催化剂非常接近的催化活性。这是由于在混合金属相中Pt和Co的粒径明显较小，这与纯Pt相的粒径有关。较少的Pt可以用较高的活性催化中心表面积来补偿。

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