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本文研究出一种利用硫模板制备多孔石墨纳米笼的方法,其核心为利用空气氧化将石墨层中掺杂的硫除去并在原位产生纳米孔洞。硫的掺杂是在碳包裹铁纳米核壳颗粒制备中同时进行的,随后将其中铁基内核除去即得硫掺杂的石墨纳米笼。将其中的硫除去后,石墨纳米笼的比表面积(由540 m2/g提高至850 m2/g)和介孔孔容(由0.44 cm3/g提高至0.9 cm3/g)均有显著提高。与传统制备多孔石墨纳米材料的方法相比,本方法在显著提高材料比表面积的同时未对纳米笼的石墨化结构有明显破坏。
In this paper, a method of preparing porous graphite nanocages by sulfur template was developed. The core of the method was the removal of sulfur doped in the graphite layer by air oxidation and the formation of nanopores in situ. Sulfur doping is carried out simultaneously in the preparation of carbon-coated iron core-shell particles, and then the iron-based core is removed to obtain a sulfur-doped graphite nanocage. After the sulfur was removed, the specific surface area (from 540 m2 / g to 850 m2 / g) and mesopore volume (from 0.44 cm3 / g to 0.9 cm3 / g) of graphite nanocages were significantly increased. Compared with the traditional method for preparing porous graphite nanomaterials, the method notably improves the specific surface area of the material without significantly damaging the graphitization structure of the nanocage.