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

为了催化炭纤维原位生长纳米炭纤维／纳米碳管，研究纳米炭纤维／纳米碳管在炭／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。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处理能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；浸渍-还原法能获得粒径小、均匀、适合纳米炭纤维生长的金属颗粒；与Co纳米颗粒相比，Ni分散效果和催化效果更好。

COATING DIFFERENT METAL NANO-CATALYST PARTICLES ON CARBON FIBERS BY KOH-LMPREGNATION-REDUCTION AND THEIR APPLICATION

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 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 redution 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..