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首页> 外文期刊>Separation and Purification Technology >Synthesis of exfoliated CNT-metal-clay nanocomposite by chemical vapor deposition
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Synthesis of exfoliated CNT-metal-clay nanocomposite by chemical vapor deposition

机译：化学气相沉积法合成脱落的CNT-金属-粘土纳米复合材料

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A novel exfoliated carbon nanotube (CNT)-metal-clay composite was synthesized using catalyst decomposition of acetylene over nanoclay immobilized iron and platinum catalysts. The exfoliated nanoclay immobilized nano-sized catalysts, e.g. Pt or Fe, with diameters of a few nanometers was obtained via a metal organic chemical vapor deposition (MOCVD) process where the temperature of chemical vapor deposition (CVD) corresponds to an optimum decomposition temperature of organo-clay and a complete degradation of organic ligand of organic metal precursors. Counter diffusion and charge imbalance of nanoclay facilitated exfoliation of clay gallery and the uniform deposition and chemical bonding of the metal catalysts. Chemical bonding between metal catalysts and clay surfaces was verified using WAXD and transmission electron microscopy (TEM) analysis. The BET surface area and volume of the metal-clay were increased by 10 times and 3 times, respectively. The use of an organo-clay Cloisite 20A was the main course of clay exfoliation in the CVD process and the exfoliated structure was retained after the growth of MWNT as confirmed by WXRD analysis. Efforts were also made to prepare a nanocomposite membrane of MWNT-Pt-clay in Nafion for use in hydrogen fuel cells. The use of MWNT-Pt-clay in the Nafion membrane is believed to impart the membrane with simultaneously better mechanical strength, good self-humidifying performance and higher barrier resistance properties.
机译：利用乙炔在纳米粘土固定的铁和铂催化剂上的催化剂分解，合成了一种新型的剥落碳纳米管（CNT）-金属粘土复合材料。剥落的纳米粘土固定化的纳米级催化剂，例如通过金属有机化学气相沉积（MOCVD）工艺获得了直径为几纳米的Pt或Fe，其中化学气相沉积（CVD）的温度对应于有机粘土的最佳分解温度和有机配体的完全降解有机金属前体。纳米粘土的相反扩散和电荷不平衡促进了粘土廊的剥离以及金属催化剂的均匀沉积和化学键合。使用WAXD和透射电子显微镜（TEM）分析验证了金属催化剂与粘土表面之间的化学键合。金属粘土的BET表面积和体积分别增加了10倍和3倍。 WXRD分析证实，使用有机粘土Cloisite 20A是CVD工艺中粘土剥落的主要过程，并且在MWNT生长后，剥落的结构得以保留。还努力在Nafion中制备MWNT-Pt-粘土纳米复合膜，用于氢燃料电池。据信在Nafion膜中使用MWNT-Pt粘土可同时赋予膜更好的机械强度，良好的自增湿性能和更高的阻隔性能。

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