Structure and electrocatalytic activity of carbon-supported Pt-Ni alloy nanoparticles toward the oxygen reduction reaction
Structure and electrocatalytic activity of carbon-supported Pt-Ni alloy nanoparticles toward the oxygen reduction reaction
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DOI：
10.1021/jp049034
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发表时间：
2004-06
影响因子：
3.3
通讯作者：
Hui Yang;W. Vogel;C. Lamy;N. Alonso‐Vante
中科院分区：
文献类型：
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作者：
Hui Yang;W. Vogel;C. Lamy;N. Alonso‐Vante
通过羰基络合物路线制备了具有不同Pt/Ni原子组成的Vulcan XC-72碳载Pt−Ni合金纳米颗粒催化剂，并通过广角X射线衍射（WAXS）和德拜函数分析（DFA）研究了其结构。WAXS图谱和DFA模拟之间非常好的一致性表明，所有制备的Pt−Ni合金催化剂都具有独特的高度无序的面心立方结构（固溶体），并且晶格参数随着合金中Ni含量的增加而减小。透射电子显微镜（TEM）图像表明，所制备的Pt-Ni合金纳米颗粒在碳载体表面分散良好，粒径分布较窄，且其平均粒径随Ni含量的增加而略有减小。能量分散X射线分析（EDX）证实催化剂组成与标称值几乎相同。因此，进行比较研究是必要的。
Vulcan XC-72 carbon-supported Pt−Ni alloy nanoparticle catalysts with different Pt/Ni atomic composition were prepared via the carbonyl complex route and their structure was studied by X-ray diffraction spectroscopy at wide angles (WAXS) and Debye function analysis (DFA). The very good agreement between the WAXS pattern and DFA simulation revealed that all the as-prepared Pt−Ni alloy catalysts have a unique and highly disordered face-centered cubic structure (solid solution) and that the lattice parameter decreases with the increase of the Ni content in the alloys. Transmission electron microscopy (TEM) images indicated that the as-prepared Pt−Ni alloy nanoparticles were well dispersed on the surface of the carbon support with a narrow particle size distribution and that their mean particle size slightly decreased with the increase in Ni content. Energy-dispersive X-ray analysis (EDX) confirmed that the catalyst composition was nearly the same as that of the nominal value. Thus, a comparative study was ma...