KOH-浸渍-还原法在炭纤维表面涂层金属纳米催化剂颗粒及其应用讲述.doc

·研究论文· KOH-浸渍-还原法在炭纤维表面制备不同金属纳米催化剂涂层及其应用 王占锋* 廖寄乔 周建伟 （中南大学 粉末冶金国家重点实验室 湖南 长沙 410083） 摘要：为了在炭纤维表面原位催化生长纳米炭纤维/纳米碳管，研究它在炭/炭复合材料中的应用,采用KOH-浸渍-还原法在炭纤维上制备纳米催化剂颗粒，再CVD法生长纳米炭纤维/纳米碳管。首先用KOH处理炭纤维改变其形貌，然后将炭纤维分别在硝酸钴和硝酸镍催化剂前驱体溶液中浸渍，干燥，再用H2气还原制得催化剂颗粒，最后催化热解CO在炭纤维上原位生长纳米炭纤维/纳米碳管。结果表明：KOH处理使炭纤维表面变得凹凸不平，有效的阻止了催化剂前驱体液体的流动，使涂层均匀分布；浸渍-还原法能获得粒径小、均匀、适合纳米碳纤维生长的金属催化剂颗粒；Ni和Co纳米颗粒相比，Ni分散效果和催化效果都更好。 关键词: KOH-浸渍-还原；纳米炭纤维/纳米碳管；催化剂；炭/炭复合材料 Coating Different Metal Nano-catalyst Particles on Carbon fibers by KOH-Impregnation-reduction and Their Application WANG，Zhan-feng* LIAO，Ji-qiao ZHOU，Jian-wei (National Key Laboratory for Powder Metallurgy, Central south University, Changsha 410083, China) Abstact：In order to in situ growing carbon nanofibers/carbon nanotubes on carbon fibers for further investigating the application of carbon nanofibers/carbon nanotubes in C/C composites, nano-nickel catalyst particles were coated on the carbon fibers’ surfaces for the growth of carbon nanofibers/carbon tubes by KOH-impregnation-reduction method. First, carbon fibers were chemical treated with KOH, and then catalyst particles were produced by impregnated in Ni(NO3)2 or Co(NO3)2 solution, followed by reduction with H2 as reduction gas. Finally, in situ grown carbon nanofibers /carbon nanotubes were produced by chemical vapor deposition with CO as carbon source. The results showed that KOH changed the surface of carbon fibers, which made coating of catalyst precursor was uniform. The procedure of impregnation-reduction could effectively coated nano-catalyst particles on carbon fibers for growing carbon nanofibers /carbon nanotubes. It was also found the dispersal and catalytic effect of Ni was better than Co catalyst. Key words：impregnation-reduction; Carbon nanofibers/carbon nanotubes; Catalyst; Carbon/carbon composites 纳米炭纤维/纳米碳管具有高比模量，高比强度，高导电性等优异性能［1，2］，用它作为二次增强添加材料可以进一步提高C/C复合材料的性能，如导热性，摩擦性等[3]。用纳米炭纤维/纳米碳管直接掺杂制备的复合材料存在界面结合不牢和分散不均的问题，使复合材料的性能不理想，而在炭纤维表面原位生长米炭纤维/纳米碳管再做复合材料就可以避免上述问题。目前，制备纳米炭纤维/纳米