Colloidal Synthesis and Characterization of Carbon-Supported Pd-Cu Nanoparticle Oxygen Reduction Electrocatalysts
Colloidal Synthesis and Characterization of Carbon-Supported Pd-Cu Nanoparticle Oxygen Reduction Electrocatalysts
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DOI：
10.1021/cm100155z
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发表时间：
2010-07-27
影响因子：
8.6
通讯作者：
Myers, Deborah J.
中科院分区：
文献类型：
--
作者：
Kariuki, Nancy N.;Wang, Xiaoping;Myers, Deborah J.
控制金属或合金纳米颗粒的尺寸和组成的能力在制备催化剂中是重要的。本文报道了一种制备单分散钯铜（Pd-Cu）合金纳米颗粒的胶体合成方法，所制备的颗粒的平均直径为3 nm，去除封端剂后的平均直径为5-10 nm。我们的方法涉及使用金属前体，封端剂，和还原剂在一个单一的有机相的纳米粒子形成的控制比例，然后通过沉积的封端的纳米粒子上的高表面积碳和去除的封端剂通过热处理中的氧化或还原气氛。利用透射电子显微镜-能量色散X射线分析（TEM-EDX），X射线光电子能谱（XPS），傅里叶变换红外光谱（FTIR），程序升温氧化还原结合质谱（TPO/TPR-MS），粉末X射线衍射（XRD）和循环伏安法（CV）的表征结果进行了讨论。在酸性电解液中，高比表面积碳负载Pd-Cu催化剂（PdCu/C）对氧还原反应（ORR）表现出较高的活性。我们的研究揭示了组成和热处理依赖性ORR活性。
The ability to control the size and composition of metal or alloys nanoparticles is important in preparing catalysts. This paper reports a colloidal synthesis methodology for the preparation of monodisperse palladium copper (Pd-Cu) alloy nanoparticles with an average diameter of 3 nm for the as-prepared particles and 5-10 nm upon removal of the capping agents. Our approach involves the use of metal precursors, capping agents, and reducing agents in controlled ratios for nanoparticle formation in a single organic phase, followed by deposition of the capped nanoparticles on high surface area carbon and removal of the capping agents via heat treatment in either oxidizing or reducing atmosphere. The results of characterizations using transmission electron microscopy-energy dispersive X-ray analysis (TEM-EDX), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), temperature programmed oxidation and reduction combined with mass spectrometry (TPO/TPR-MS), powder X-ray diffraction (XRD), and cyclic voltammetry (CV) are discussed. The resulting high-surface-area-carbon-supported Pd-Cu catalysts (PdCu/C) showed high activity for the oxygen reduction reaction (ORR) in acidic electrolyte. Our study revealed composition and heat-treatment dependent ORR activity.