乙二胺接枝改性碳纳米管负载的乙醇氧化电催化剂Pt及Pt-Ru的制备及电催化性质

采用化学法制备了乙二胺接枝改性碳纳米管（ED/MWNTs）负载的Pt及Pt-Ru催化剂,并用红外光谱法、透射电镜分析（TEM）及X射线能谱技术对催化剂进行了表征。结果表明：乙二胺对碳纳米管的改性使Pt及Pt-Ru在碳管上的分布更均匀，粒径更小。同时，催化剂对乙醇电催化氧化活性的电化学研究结果表明：乙二胺改性可明显提高Pt-Ru/MWNTs/C 和Pt/MWNTs/C的电催化活性，而且Pt/ED/MWNTs/C的活性甚至比Pt-Ru/MWNTs/C的活性还高。由此，ED/MWNTs作为乙醇电氧化催化剂的载体有着很好的应用前景。

Pt and Pt‐Ru Nanoparticles Dispersed on Ethylenediamine Grafted Carbon Nanotubes as New Electrocatalysts: Preparation and Electrocatalytic Properties for Ethanol Electrooxidation

As the support of Pt and Pt‐Ru catalysts for ethanol electrooxidation, the ethylenediamine (ED)‐grafted multiwalled carbon nanotubes (MWNT) were prepared by a chemical synthesis method and characterized by Fourier transform infrared spectroscopy. The morphology and elemental composition of the Pt‐Ru/ED/MWNT and Pt/ED/MWNT catalysts were characterized by transmission electron microscopy (TEM) and energy dispersive X‐ray spectroscopy. TEM results demonstrate that the ED‐grafted MWNT is beneficial to loading Pt‐Ru and Pt electrocatalysts with well dispersion and small particle sizes. On the other hand, the electrocatalytic properties of the Pt‐Ru/ED/MWNT and Pt/ED/MWNT catalysts were characterized by cyclic voltammetry and chronoamperometry. Under the same loading mass of catalyst, the electrocatalytic activities of both Pt‐Ru/MWNT/graphite and Pt/MWNT/graphite electrodes are enhanced obviously by the introduction of ED. The electrocatalytic activity of the Pt/ED/MWNT/graphite electrode is even higher than that of the Pt‐Ru/MWNT/graphite electrode. These results indicate that the ED/MWNT is a promising catalyst support for ethanol electrooxidation.