掺氮石墨烯作为氧还原催化剂的活性位的研究
首发时间:2013-12-27
摘要:掺氮石墨烯被作为燃料电池上阴极氧还原的一种非贵金属催化剂来研究, 可通过裂解离子交换树脂来制备石墨烯以及通过另外裂解含氮前驱体来实现氮掺杂。透射电子显微镜(TEM)证明石墨烯有8-10层, 氮掺杂引起的石墨烯缺陷情况可通过拉曼(Raman)来检测,掺杂的氮可由光电子能谱(XPS)详细地研究,一个特殊形式的氮:山谷氮是显著的。山谷氮被证明在氧还原中发挥着一个重要的作用,而发现含氮量与掺氮催化剂在氧还原上的活性没有直接的关系。
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Active sites of N-doped graphene
Abstract:Nitrogen-doped graphene is studied as a kind of non-noble metal catalyst for the oxygen reduction reaction in the cathode of fuel cells. Graphene is synthesized by pyrolyzing ion exchange resin and nitrogen doping is realized by a second pyrolysis step with nitrogen precursor. High resolution transmission electron microscopy proves the graphene is composed by 8-10 graphitic layers. The defect of graphene caused by nitrogen doping is detected by Raman spectra. The nitrogen group of the doped graphene is studied in detail with X-ray photoelectron spectroscopy spectra and a special type of nitrogen: valley-N is distinguished. The valley-N is proved to play an important role in the oxygen reduction reaction. Nitrogen content is found not directly related with the activity of the oxygen reduction reaction.
Keywords: fuel cell oxygen reduction reaction nitrogen-doped graphene
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