School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China.
J Colloid Interface Sci. 2012 Oct 15;384(1):105-9. doi: 10.1016/j.jcis.2012.06.060. Epub 2012 Jul 2.
We proposed a facile route to one-step synthesis of well-dispersed PtCo alloy nanoparticles with dendritic morphology. Platinum acetylacetonate [Pt(acac)(2)] and cobalt acetylacetone [Co(acac)(2)] were chosen as the precursors to prepare PtCo alloy nanoparticles under a relatively mild condition with anhydrous ethylenediamine and poly(vinyl pyrrolidone) (PVP) as solvent and surfactant, respectively, in the presence of NaBH(4). Structural characterizations with transmission electron microscopy (TEM) and X-ray powder diffraction (XRD) revealed that PtCo nanoparticles possess an interesting dendritic morphology with excellent structural continuity and integrity. As an alternative cathodic electrocatalyst, PtCo nanodendrites (NDs) showed very high activity for oxygen reduction reaction (ORR) with half-wave potential at 0.877 V (versus RHE), which is nearly 50 mV more positive as compared with that of the commercial Pt/C catalyst (0.828 V). The Pt mass activity and specific activity were 0.11A/mg(Pt) and 0.68 mA/cm(2), respectively (1.5 and ~4.5 times higher than the corresponding values for the commercial Pt catalysts), at 0.9 V.
我们提出了一种简便的方法，一步合成具有枝状形态的高度分散的 PtCo 合金纳米粒子。选择乙酰丙酮铂[Pt(acac)(2)]和乙酰丙酮钴[Co(acac)(2)]作为前体，在无水乙二胺和聚乙烯吡咯烷酮（PVP）的存在下，分别作为溶剂和表面活性剂，在硼氢化钠的存在下，在相对温和的条件下制备 PtCo 合金纳米粒子。透射电子显微镜（TEM）和 X 射线粉末衍射（XRD）的结构表征表明，PtCo 纳米粒子具有有趣的枝状形态，具有极好的结构连续性和完整性。作为一种替代的阴极电催化剂，PtCo 纳米树枝状结构（NDs）对氧还原反应（ORR）表现出非常高的活性，半波电位约为 0.877 V（相对于 RHE），比商用 Pt/C 催化剂（0.828 V）正 50 mV 左右。在 0.9 V 时，Pt 的质量活性和比活性分别为 0.11 A/mg(Pt)和 0.68 mA/cm(2)，分别是商用 Pt 催化剂相应值的 1.5 倍和 4.5 倍。
