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在15 nm金纳米粒子(Au NPs)和4-(2-羟乙基)-哌嗪乙磺酸(HEPES)混合溶液中,Pt~(2+)在金催化作用下被HEPES还原为Pt原子并沉积于Au NPs表面,常温下制备了单原子层Pt包覆Au核的核壳纳米结构(Au@Pt NPs).通过紫外可见吸收光谱(UV-Vis)、高分辨透射电镜(HRTEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)以及电感耦合等离子体-原子发射光谱(ICP-AES)等对材料的晶体结构和形貌进行了表征.电化学测试表明,表面具有单原子层铂的Au@Pt NPs对氧气还原反应表现了良好的电催化性能,在碱性溶液中其电化学活性面积(ECSA,183.40 cm~2/mgPt)和质量活性(.0.075 V下为573.2 mA/mgPt)分别为商业Pt/C催化剂(102 cm2/mgPt和113.39 mA/mgPt)的1.72和5.06倍.
Pt ~ (2+) was reduced by HEPES to Pt atom in gold nanoparticles (Au NPs) and 4- (2-hydroxyethyl) -piperazine ethanesulfonic acid (HEPES) And deposited on the surface of Au NPs. At room temperature, Au @ Pt NPs with single atomic layer Pt-coated Au core were prepared by UV-Vis, high resolution transmission electron microscopy (HRTEM) The crystal structure and morphology of the material were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma-atomic emission spectrometry (ICP-AES) Atomic layer Au @ Pt NPs exhibited good electrocatalytic performance for oxygen reduction. The electrocatalytic activity (ECSA, 183.40 cm ~ 2 / mgPt) and mass activity (573.2 at 0.075 V) mA / mgPt) were 1.72 and 5.06 times the commercial Pt / C catalysts (102 cm2 / mgPt and 113.39 mA / mgPt, respectively).