Enhanced activity of Pt nanoparticle catalysts supported on manganese oxide-carbon nanotubes for ethanol oxidation

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• 作者：Jindi Cai ; Yiyin Huang ; Binbin Huang ; Shiying Zheng ; Yonglang Guo
• 关键词：Ethanol oxidation ; Fuel cells ; Manganese oxides ; Microwave method ; Platinum nanoparticles
• 刊名：International Journal of Hydrogen Energy
• 出版年：13 January, 2014
• 年：2014
• 卷：39
• 期：2
• 页码：798-807
• 全文大小：2643 K

文摘

Pt nanoparticles deposited on manganese oxide-carbon nanotubes (Pt/MnO_x-CNTs) are prepared by a microwave-assisted polyol method. Their structure characterizations are carried out by Fourier transform infrared spectrometry (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) measurements, indicating that MnO_x nanoparticles cover the surface of CNTs and then Pt nanoparticles are uniformly dispersed on MnO_x-CNTs with the average particle size of about 2.2聽nm. Ethanol oxidation peak current on Pt/MnO_x-CNTs (1141.4聽mA聽mg^鈭?聽Pt) is 1.82 times higher than that on Pt/CNTs (626.4聽mA聽mg^鈭?聽Pt) and 1.28 times higher than that on PtRu/C (JM) (888.6聽mA聽mg^鈭?聽Pt). The Pt/MnO_x-CNT catalyst presents not only excellent electrocatalytic activity and very high stability for ethanol oxidation, but also high tolerance to the poisonous carbonaceous intermediates generated during ethanol oxidation compared to Pt/CNT catalyst. This is attributed to the excellent proton conductivity of MnO_x and the synergistic effect between Pt and MnO_x. The optimum mass ratio of MnO_x to CNTs is 1:1 in the Pt/MnO_x-CNT catalysts.