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A novel carbon fiber pretreatment was proposed. Polyacrylonitrile (PAN)-based carbon fibers were first anodized in H3PO4 electrolyte to achieve an active surface, and then coated with Mo-B catalysts by immersed the carbon fibers in a uniformly
dispersed Mo-B sol. The as-treated carbon fibers were then graphitized at 2 400 °C for 2 h. The structural changes were characterized
by X-ray diffractometry (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and high-resolution transmission electronic
microscopy (HRTEM). The results show that much better graphitization can be achieved in the presence of Mo-B, with an interlayer
spacing (d
002) of 0.335 8 nm and a crystalline size (L
c) of 28 nm. 相似文献
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为了开发TiO2纳米管在电化学中的应用,该文制备了Pt/CNT/TiO2复合电极,研究其作为高效绿色新能源电极材料的应用.以300nm长的TiO2纳米管阵列为基底,聚乙二醇6000为碳源,镍为碳的催化剂,使无序的碳纳米管(CNT)生长在TiO2纳米管阵列的表面,呈现出多孔网络状结构.在CNT/TiO2复合纳米管上应用恒电流法沉积Pt纳米颗粒,使之高度分散在TiO2纳米管的表面.该复合材料具有很好的吸附性和导电性,是一种性能优异的甲醇催化氧化反应(MOR)的新阳极材料.当Pt的负载量为50.52μg cm-2,MOR电流密度高达178.2 mA,获得了良好的催化效率. 相似文献
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One-step pretreatment,anodization,is used to activate the polyacrylonitrile (PAN)-based carbon fibers instead of the routine two-step pretreatment,sensitization with SnCl2 and activation with PdCl2.The effect of the anodization pretreatment on the graphitization of PAN-based carbon fibers is investigated as a function of Ni-P catalyst.The PAN-based carbon fibers are anodized in H3PO4 electrolyte resulting in the formation of active sites,which thereby facilitates the following electroless Ni-P coating.Carbon fibers in the presence and absence of Ni-P coatings are heat treated and the structural changes are characterized by X-ray diffraction and Raman spectroscopy,both of which indicate that the graphitization of PAN-based carbon fibers are accelerated by both the anodization treatment and the catalysts Ni-P.Using the anodized carbon fibers,the routine two-step pretreatment,sensitization and activation,is not needed. 相似文献
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<正>中国山水画迄今大约有一千五百多年的历史。其独特的民族风格与艺术魅力,对东方绘画艺术产生了重要影响。山水画的产生,是我们的先辈在创造文明的过程中,发现自然美,并给予艺术表现的结果,将自己对自然感悟后得到的意 相似文献
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