Synthesis of highly active and stable Au-PtCu core-shell nanoparticles for oxygen reduction reaction.
Synthesis of highly active and stable Au-PtCu core-shell nanoparticles for oxygen reduction reaction.
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DOI：
10.1039/c2cp42716h
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
Chiajen Hsu;Chienwen Huang;Y. Hao;Fuqiang Liu
中科院分区：
文献类型：
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作者：
Chiajen Hsu;Chienwen Huang;Y. Hao;Fuqiang Liu
通过在空心Au纳米球上用Pt电置换Cu，成功制备了Au-PtCu核壳纳米粒子。通过X射线衍射（XRD）、透射电子显微镜（TEM）和电化学测试对纳米粒子进行了表征。结果表明，在旋转盘电极系统中测量的氧还原反应（ORR）中，Au-PtCu催化剂的比活性和质量活性比商业Pt黑和Pt/C高2-2.5倍。此外，较薄的PtCu涂层（25 nm厚，沉积时间为20 min）的空心Au纳米球上表现出显着的CO氧化峰位移（0.13 V）和长期的耐久性，可能是由于独特的核壳结构和强烈的电子耦合之间的Au核和PtCu壳。
Au-PtCu core-shell nanoparticles were successfully synthesized via galvanic replacement of Cu by Pt on hollow Au nano-spheres. Characterizations of the nanoparticles were conducted by X-ray diffraction (XRD), transmission electron microscopy (TEM), and electrochemical measurements. Results indicate 2-2.5 times higher specific activity and mass activity of the Au-PtCu catalysts than commercial Pt black and Pt/C in oxygen reduction reaction (ORR), measured in a rotating disk electrode system. Besides, thinner PtCu coating (25 nm thick, deposition time of 20 min) on the hollow Au nano-spheres demonstrated a pronounced CO oxidation peak shift (by 0.13 V) and long-term durability probably due to the unique core-shell structure and strong electronic coupling between the Au core and the PtCu shell.