三种碳源对CNF/AC复合材料性能的影响

The effect of the three carbon resources on the properties of CNF/AC composite

采用甲烷、正丁烷、乙炔3种烃类气体作为碳源,纳米金属镍为催化剂,在活性炭(AC)上生长了纳米碳纤维(CNF)。通过氮气等温吸附、粉末比电阻、扫描电镜(SEM)和X光衍射(XRD)等一系列表征手段,比较了3种碳源对获得的CNF/AC复合材料的比表面积、导电性,以及其中的CNF形貌的影响。结果表明,在相同生长条件下,碳沉积速度与碳源气的碳氢比成正相关,与产物的比表面积成负相关。提出碳源气在化学气相沉积(CVD)过程对产物性能影响的机理,提出依据分子中碳气原子比选择烃类碳源气,从而提高CVD过程催化分解反应选择性的方法。

Three kinds of hydrocarbon gases,i.e.,methane,butane,and acetylene,were used as carbon source in the growth of carbon nanofiber（CNF）on activated carbon（AC）.A series of characterization methods including nitrogen adsorption,powder electrical resistivity,scanning electron microscopy（SEM）,and X-ray diffraction（XRD） were used to investigate the properties of resultant samples.The results showed that,under the same growth conditions,with the increase in the ratio of C/H,carbon deposition rate increased,while the surface area of the product decreased.The existence of two competitive reactions in the CVD process was proposed.Thereby enhancing the selectivity of catalytic decomposition reaction of the carbon resource during CVD can lead to a CNF/AC composite with high performance.