石墨烯
材料科学
碳纳米管
X射线光电子能谱
复合数
化学工程
色散(光学)
碳纤维
纳米技术
质子交换膜燃料电池
吸附
催化作用
复合材料
化学
有机化学
工程类
物理
光学
作者
Shiming Zhang,Heyou Zhang,Qing Liu,Shengli Chen
出处
期刊:Journal of materials chemistry. A, Materials for energy and sustainability
[The Royal Society of Chemistry]
日期:2013-01-01
卷期号:1 (10): 3302-3302
被引量:114
摘要
Low cost alternatives to the expensive and scarce Pt to catalyze the oxygen reduction reaction (ORR) in acid media are essential for the proton-exchange-membrane (PEM) fuel cells to become economically viable. Chemically doped nanocarbons are among the most promising candidates in this regard. We report the facile synthesis and superior electrocatalytic activity of an Fe–N doped nanocarbon composite of carbon nanotubes (CNTs) grown on/between graphene sheets. The structure and composition of the composite is characterized by using a variety of techniques including SEM, TEM, N2 adsorption/desorption isotherms, XPS, XRD, and Mössbauer spectroscopy. It is shown that the in situ growth of CNTs in the presence of graphene sheets not only produces a tubes-on/between-sheets architecture that enhances the dispersion of CNTs and graphene sheets, but also leads to optimized doping and coordination of nitrogen and Fe which favour the ORR. The composite can catalyze the ORR much more efficiently than either of the single materials containing only CNTs or graphene synthesized under similar conditions, and similarly to Pt/C in both alkaline and acid media.
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