The Study Of Platinum/Palladium Catalysts Deposited On Nickel Nanowire/Nanotube Arrays

Proton exchange membrane fuel cells, especially the direct elcohol fuel cellsbecome the most favorable mobile power supply for various types of equipment andattracted a lot of research focus in recent years due to the low operating temperature,high safety and high efficiency. The efficiency and cost of the catalyst of fuel cellsare very important to the application and popularization, but the catalyst Pt isexpensive. The preparation and its application of Ni ordering carrier membraneelectrode were studied because of the advantage of ordering membrane electrode instructure, and performance of the performance of the related catalyst was studiedtoo.Electrochemical anodic oxidation method was used to produce the anodicaluminum oxide (AAO) template. The solution composition and related technologyof the anodic oxidation was studied to prepare the AAO template, of which, the holedensity was1.5108/m~2. The diameter of the holes was about100nm, and thethickness of the holes was about30nm.The pretreatment technology and conditions of chemical nickel plating,chemical nickel plating additive, and the electroplating nickel process conditionswere determined, and the AAO template with diameter of100nm and250nm wereused to make the Ni nanowire arrays and Ni nanotubes arrays. The Ni plate and Ninanowires/nanotubes arrays were studied as electrodes by cyclic voltammetry inalkaline solution to determine the behavior of the catalytic oxidation of ethanol, andthe results showed that the specific surface area of Ni nanowires/nanotubes arrayswere much greater than that of Ni plate electrode.The loading method of Pt, Pd, Pt-Pd catalyst on to Ni nanowires/tubes arrayssupports was studied. The catalyst with ideal morphology was prepared by adjustingthe solution composition and operating time, using substitution reaction. It wasfound that Pt and Pd were distributed uniformly on the Ni nanowires/tubes arraysSEM. The ICP test showed that the load of Pt and Pd were both below0.8mg/cm2.Cyclic voltammetric behavior of catalyst in alkaline solution, and the catalyticability to ethanol oxidation reaction were studied. Results showed that the catalystwith Ni nanowires/nanotubes arrays had larger specific surface area, and Ninanotubes arrays was better than Ni nanowire arrays as the support of catalyst. Thecatalytic ability of ethanol oxidation in the alkaline solution of Pd was better thanthat of Pt, but it’s opposite for the intermediate oxidation. The Pt-Pd compositecatalyst loaded on the Ni nanowires/tubes arrays had both good catalytic activity, and intermediate oxidation ability.