Heat-Treated PtCo₃ Nanoparticles as Oxygen Reduction Catalysts
Heat-Treated PtCo₃ Nanoparticles as Oxygen Reduction Catalysts
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热处理 PtCo₃ 纳米颗粒作为氧还原催化剂
DOI：
10.1021/jp808134j
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发表时间：
2009
影响因子：
3.7
通讯作者：
["H. Schulenburg
中科院分区：
文献类型：
--
作者：
["H. Schulenburg
制备用于氧还原的PtCo 3/C催化剂，并在还原条件下在350 ° C和1000 °C之间热处理。采用循环伏安法对催化剂进行活化，使钴部分氧化浸出。随后的旋转盘电极测量显示在800 °C回火的样品的最大质量活性，其产生比商业PtCox/C高2.4倍的活性。TEM图像显示，PtCo 3/C催化剂的粒度几乎保持恒定，直到达到600 °C的温度;进一步的温度升高导致明显的颗粒生长和粒度分布的加宽。XRD测量表明，热处理导致fcc-Pt、Pt 3Co、fct-PtCo、fcc-PtCo和钴的形成。fct和fcc-PtCo相存在于具有最高催化活性的样品中。
PtCo3/C catalysts for oxygen reduction were prepared and heat-treated between 350 and 1000 °C under reductive conditions. The catalysts were activated by cyclic voltammetry, which resulted in the partial oxidative leaching of cobalt. Subsequent rotating disk electrode measurements showed a maximum mass activity for samples tempered at 800 °C, which yielded a 2.4 times higher activity than commercial PtCox/C. TEM images revealed that the particle size of the PtCo3/C catalysts remains almost constant until a temperature of 600 °C is reached; a further temperature increase leads to a noticeable particle growth and a broadening of the particle size distribution. XRD measurements showed that heat treatment leads to the formation of fcc-Pt, Pt3Co, fct-PtCo, fcc-PtCo, and cobalt. The fct- and fcc-PtCo phases are present in samples with the highest catalytic activities.