Onion-like fullerenes synthesized by arc discharge in water were used as support of Pt nanoparticles as electrocatalytic materials for direct methanol fuel cell. Uniform platinum nanoparticles with the average diamete...Onion-like fullerenes synthesized by arc discharge in water were used as support of Pt nanoparticles as electrocatalytic materials for direct methanol fuel cell. Uniform platinum nanoparticles with the average diameter of about 4.3 nm were well dispersed on the surface of onion-like fullerenes by impregnation-reduction method. The morphologies and microstructures of the as-prepared composites were studied by means of XRD and TEM. Electrochemical analysis shows that this kind of nano material may be an excellent candidate to be used as the support of catalyst for methanol electrochemical oxidation.展开更多
Onion-like Fullerenes were produced at high-temperature in vacuum. The morphology of the carbon nano onion-like fullerenes was examined and characterized by high-resolution transmission electron microscopy (HRTEM). It...Onion-like Fullerenes were produced at high-temperature in vacuum. The morphology of the carbon nano onion-like fullerenes was examined and characterized by high-resolution transmission electron microscopy (HRTEM). It can be seen that the nano-sized, onion-like fullerenes possess high degree of graphization. The results suggested that the catalyst is the main factor affecting the size and yield of the fullerenes. The method is very promising for simple mass production.展开更多
Nano-carbon materials were synthesized by the catalytic decomposition of acetylene at 400℃ by using Fe/Al2O3 as catalyst. The product was refluxed in 36% concentrated HCl at 60℃ for 48 h in order to re-move the cata...Nano-carbon materials were synthesized by the catalytic decomposition of acetylene at 400℃ by using Fe/Al2O3 as catalyst. The product was refluxed in 36% concentrated HCl at 60℃ for 48 h in order to re-move the catalyst support. The samples were examined by scanning and high resolution transmission electron microscopy,energy dispersive spectroscopy and X-ray diffraction. The results show that nano onion-like fullerenes encapsulating a Fe3C core were obtained. These had a structure of stacked graphitic fragments,with diameters ranging from 15―50 nm. When the product was further heat-treated at 1100℃ for 2 h,nano onion-like fullerenes with a clear concentric graphitic layer structure were obtained. The growth mechanism of nano onion-like fullerenes encapsulating metal cores is suggested to follow a vapor-solid growth model.展开更多
A novel way for a compressor to improve its coefficient of performance and enhance its reliability by employing nano-refrigeration lubricant oil was proposed. Onion like fullerenes (OLFs) and NiFe2O4 nano-composites, ...A novel way for a compressor to improve its coefficient of performance and enhance its reliability by employing nano-refrigeration lubricant oil was proposed. Onion like fullerenes (OLFs) and NiFe2O4 nano-composites, modified by Span 80, were dispersed in refrigeration oil KFR22 by solid grinding (SG). Morphologies of NiFe2O4 nano-composites were characterized by using transmission electron microscope (TEM). The tribological properties as a refrigeration lubricants additive were investigated using SRV (II), a multi-functional reciprocating friction and wear tester. The results showed that the friction coefficient was decreased from 0.15 to 0.04.展开更多
探索了纯石墨电极在水中放电制备洋葱状富勒烯(Onion-like fu llerenes,OLFs)的过程和工艺。用高分辨透射电镜(H igh reso lution transm ission electron m icroscope,HRTEM)对生成的OLFs进行了形貌、结构的观察与表征。分析结果表明...探索了纯石墨电极在水中放电制备洋葱状富勒烯(Onion-like fu llerenes,OLFs)的过程和工艺。用高分辨透射电镜(H igh reso lution transm ission electron m icroscope,HRTEM)对生成的OLFs进行了形貌、结构的观察与表征。分析结果表明制得的OLFs具有各种不同形状的内核,石墨化程度很高,直径分布在5nm^40nm范围内。在一定范围内随着电流强度的增大OLFs的产量和产率都有不同程度的提高。展开更多
基金This work was financially supported by National Basic Research Program of China (No.2004CB217808), National Natural Science Foundation of China (No.20471041) Key Project of National Natural Science Foundation of China (No.90306014), Natural Science Foundation of Shanxi Province (No.20051018) and Shanxi Research Fund for Returned Scholars (No.200428,200523).
文摘Onion-like fullerenes synthesized by arc discharge in water were used as support of Pt nanoparticles as electrocatalytic materials for direct methanol fuel cell. Uniform platinum nanoparticles with the average diameter of about 4.3 nm were well dispersed on the surface of onion-like fullerenes by impregnation-reduction method. The morphologies and microstructures of the as-prepared composites were studied by means of XRD and TEM. Electrochemical analysis shows that this kind of nano material may be an excellent candidate to be used as the support of catalyst for methanol electrochemical oxidation.
基金supported by National Natural Science Foundation(59871032,90306014)National Excellent Youth Foundation(50025103).
文摘Onion-like Fullerenes were produced at high-temperature in vacuum. The morphology of the carbon nano onion-like fullerenes was examined and characterized by high-resolution transmission electron microscopy (HRTEM). It can be seen that the nano-sized, onion-like fullerenes possess high degree of graphization. The results suggested that the catalyst is the main factor affecting the size and yield of the fullerenes. The method is very promising for simple mass production.
基金Supported by National Natural Science Foundation of China (Grant Nos.20471041,20676086 and 20673072)
文摘Nano-carbon materials were synthesized by the catalytic decomposition of acetylene at 400℃ by using Fe/Al2O3 as catalyst. The product was refluxed in 36% concentrated HCl at 60℃ for 48 h in order to re-move the catalyst support. The samples were examined by scanning and high resolution transmission electron microscopy,energy dispersive spectroscopy and X-ray diffraction. The results show that nano onion-like fullerenes encapsulating a Fe3C core were obtained. These had a structure of stacked graphitic fragments,with diameters ranging from 15―50 nm. When the product was further heat-treated at 1100℃ for 2 h,nano onion-like fullerenes with a clear concentric graphitic layer structure were obtained. The growth mechanism of nano onion-like fullerenes encapsulating metal cores is suggested to follow a vapor-solid growth model.
文摘A novel way for a compressor to improve its coefficient of performance and enhance its reliability by employing nano-refrigeration lubricant oil was proposed. Onion like fullerenes (OLFs) and NiFe2O4 nano-composites, modified by Span 80, were dispersed in refrigeration oil KFR22 by solid grinding (SG). Morphologies of NiFe2O4 nano-composites were characterized by using transmission electron microscope (TEM). The tribological properties as a refrigeration lubricants additive were investigated using SRV (II), a multi-functional reciprocating friction and wear tester. The results showed that the friction coefficient was decreased from 0.15 to 0.04.
文摘探索了纯石墨电极在水中放电制备洋葱状富勒烯(Onion-like fu llerenes,OLFs)的过程和工艺。用高分辨透射电镜(H igh reso lution transm ission electron m icroscope,HRTEM)对生成的OLFs进行了形貌、结构的观察与表征。分析结果表明制得的OLFs具有各种不同形状的内核,石墨化程度很高,直径分布在5nm^40nm范围内。在一定范围内随着电流强度的增大OLFs的产量和产率都有不同程度的提高。
