摘要
Polyacrylonitrile (PAN)-based activated carbon fibers (ACFs) are amorphous graphitic carbon, consisting of sp2 hexagonal carbon layers with different sizes of pores ranging from micropores to macropores. The microstructure, including graphite-like microcrystal, surface chemistry, pore size distributions and so on, of PAN activated carbon fibers prepared by different activation methods were investigated by element analysis (EA), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectra. The XRD patterns show that PAN-ACFs activated by different methods are of amorphous diffraction characteristic but composed of very small graphitic crystallites. The surface functional groups were analyzed by XPS and FT-IR spectra. The samples activated by potassium hydroxide posses less oxygen functional groups, and the samples activated by potassium hydroxide possess less oxygen functional groups. This is attributed to the different activation mechanisms.
Polyacrylonitrile (PAN)-based activated carbon fibers (ACFs) are amorphous graphitic carbon, consisting of sp2 hexagonal carbon layers with different sizes of pores ranging from micropores to macropores. The microstructure, including graphite-like microcrystal, surface chemistry, pore size distributions and so on, of PAN activated carbon fibers prepared by different activation methods were investigated by element analysis (EA), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectra. The XRD patterns show that PAN-ACFs activated by different methods are of amorphous diffraction characteristic but composed of very small graphitic crystallites. The surface functional groups were analyzed by XPS and FT-IR spectra. The samples activated by potassium hydroxide posses less oxygen functional groups, and the samples activated by potassium hydroxide possess less oxygen functional groups. This is attributed to the different activation mechanisms.
