Hashem Ahmed M, Abdel-Ghany Ashraf E, El-Tawil Rasha S, Indris Sylvio, Ehrenberg Helmut, Mauger Alain, Julien Christian M
National Research Centre, Inorganic Chemistry Department, 33 El Bohouth St. (former El Tahrir St.), Dokki, Giza P.O.12622, Egypt.
Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.
Nanomaterials (Basel). 2019 Dec 18;10(1):8. doi: 10.3390/nano10010008.
An amorphous MoO/carbon nanocomposite (m ≈ 5) is fabricated from a citrate-gel precursor heated at moderate temperature (500 °C) in inert (argon) atmosphere. The as-prepared MoO-type/C material is compared to α-MoO synthesized from the same precursor in air. The morphology and microstructure of the as-prepared samples are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman scattering (RS) spectroscopy. Thermal gravimetry and elemental analysis indicate the presence of 25.8 ± 0.2% of carbon in the composite. The SEM images show that MoO is immersed inside a honeycomb-like carbon matrix providing high surface area. The RS spectrum of MoO/C demonstrates an oxygen deficiency in the molybdenum oxide and the presence of a partially graphitized carbon. Outstanding improvement in electrochemical performance is obtained for the MoO encapsulated by carbon in comparison with the carbon-free MoO.
一种非晶态MoO/碳纳米复合材料（m≈5）由柠檬酸盐凝胶前驱体在惰性（氩气）气氛中于中等温度（500°C）下加热制备而成。将所制备的MoO型/C材料与在空气中由相同前驱体合成的α-MoO进行比较。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和拉曼散射（RS）光谱对所制备样品的形貌和微观结构进行表征。热重分析和元素分析表明该复合材料中碳的含量为25.8±0.2%。SEM图像显示MoO浸渍在蜂窝状碳基质内部，具有高比表面积。MoO/C的RS光谱表明氧化钼中存在氧缺陷以及部分石墨化碳的存在。与无碳的MoO相比，碳包覆的MoO在电化学性能方面有显著改善。
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