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改变表面活性剂1-十八烯(ODE)和油胺(OLA)或油酸(OA)的配比,以1,2-二羟基十六烷二醇作还原剂同时还原乙酰丙酮铜Cu(acac)2和乙酰丙酮钯Pd(acac)2一步法制备了单分散的球形和米花形的PdCu纳米粒子.透射电子显微镜和XRD等结构表征表明,两种形状的PdCu纳米粒子均为(111)面占优的合金纳米晶体,其平均粒径分别为(12.7±0.18)nm和(20.4±0.31)nm.电化学循环伏安法(CV)测定了两种PdCu合金纳米粒子对甲酸氧化的电催化活性.结果表明,在PdCu球形纳米粒子上得到的甲酸氧化峰电流密度约为米花状纳米粒子上的5.6倍.同时,前者显示出了更好的抗CO毒化能力.计时电流测量也表明,球状PdCu纳米粒子比米花状纳米粒子有更好的电催化稳定性能.
Alter the ratio of surfactant 1-octadecene (ODE) to oleyl amine (OLA) or oleic acid (OA) and the reduction of acetylacetonate Cu (1,2-dihydroxyhexadecanediol) acac) 2 and Pd (acac) 2 acetylacetonate were used to prepare monodispersed PdCu nanoparticles in spherical or quincunxed form. Characterization by transmission electron microscopy and XRD indicated that the PdCu nanoparticles were (111) (12.7 ± 0.18) nm and (20.4 ± 0.31) nm, respectively.The electrochemical oxidation of formic acid by two kinds of PdCu alloy nanoparticles was investigated by electrochemical cyclic voltammetry (CV) Catalytic activity.The results showed that the current density of formic acid oxidation on PdCu spherical nanoparticles was about 5.6 times that of popcorn nanoparticles.At the same time, the former showed a better resistance to CO poisoning.Current measurement also showed that, The spherical PdCu nanoparticles have better electrocatalytic stability than the popcorn nanoparticles.