中文摘要：

应用化学还原两步法制备了壳层厚度不同的Ni—Pt核壳型纳米粒子，并用XRD，XPS，TEM，SEM技术表征了微粒的表面元素组成和物理结构，用动电位扫描法考察了该纳米粒子对氧还原反应的电催化活性。实验结果表明，合成的Ni—Pt微粒为球形核壳结构纳米粒子，外直径平均值约30nm，Ni核直径约17nm，Pt壳层厚度约8nm；核壳Ni-Pt／C相对Pt／C具有更高的电催化氧还原活性和抗甲醇性，电催化氧还原活性和抗甲醇能力随Pt壳层厚度改变有明显变化，变化的规律呈火山形，核壳Ni-Pt／C催化性能随Pt壳层厚度改变的机理符合“d电子调变效应”机理。

英文摘要：

Core-shell Ni-Pt nanoparticles with different thickness of Pt shell were synthesized by two-step chemical reduction method and characterized by XRD,XPS,SEM and TEM. The activity for ORR and anti-methanol performance of Ni-Pt in acid electrolytes were studied by linear scan voltammetry on rotating disk electrode. The results indicate that the spherical Ni-core nano- particles were covered by Pt shell,the size of Ni-Pt particles was about 30nm, and the thickness of Pt shell was about 8 nm. Compared with Pt/C, Ni-Pt/C was higher in current density and lower in over-potential. Moreover, the anti-methanol performance of the catalyst was higher than that of Pt/C. The activity of ORR and anti-methanol performance on Ni-Pt/C with different thickness of Pt shell exhibited ＇volcano-type＇ behavior and the influences of Ni-core was in accordance with the theory of ＂the d-electron inductive effect ＂