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采用电化学置换法,在VulcanXC-72表面制备得到了活性高和分散性好的纳米Ptshell-Nicore电催化剂.该方法先以NaH2PO2为还原剂,化学沉积得到Ni核,Pt在Ni核表面通过原位置换形成Ni-Pt类核壳型结构.通过透射电镜(TEM)、X射线衍射(XRD)、紫外-可见光光谱(UV-Vis)和循环伏安(CV)测试证明了Pt壳层完全包覆在Ni核的表面.电化学氢吸/脱附测试结果显示,Ptshell-Nicore/XC-72的电化学活性面积为Pt/C(JM)的1.2倍,而其理论Pt担载量只为Pt/C(JM)的40%.这表明,核壳型Ni-Pt纳米粒子可以显著提高Pt的催化活性和利用率.
Electrochemical method was used to prepare nano Ptshell-Nicore electrocatalyst with high activity and good dispersibility on VulcanXC-72 surface. The method uses NaH2PO2 as reductant and chemical deposition to obtain Ni core. (Ni-Pt) core-shell structure by means of X-ray diffraction (XRD), UV-Vis and cyclic voltammetry (CV) Coated on the surface of Ni core.The electrochemical hydrogen adsorption / desorption test results showed that the electrochemical active area of Ptshell-Nicore / XC-72 was 1.2 times that of Pt / C (JM), and the theoretical Pt loading was only Pt / C (JM) 40% .This shows that the core-shell Ni-Pt nanoparticles can significantly improve the catalytic activity and utilization of Pt.