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Research
Control doping of non-metal light elements and defects for carbon nanomaterials via fluorination-defluorination process
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The basal plane of carbon materials with sp2-hybridized covalent bonds is chemically stable. However, when vacancy defects and non-metal light elements, such as boron, nitrogen, fluorine, sulfur, and phosphor, are introduced in the basal plane, their chemical and physical properties change drastically. In our study, by reacting fluorinated carbon nanomaterials with ammonia gas at 300–600 °C, we succeeded in synthesizing nitrogen-doped carbon nanomaterials (with pyridinic-, pyrrolic-, and graphitic-type nitrogen species). |
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Hydrogen energy is a candidate for a new alternative energy system because hydrogen molecules can be generated from various resources, stored, and transported. Although hydrogen-energy-harnessing polymer electrolyte fuel cells (PEFCs) have been expected, they have not yet been widely used. Platinum, an oxygen reduction reaction (ORR) catalyst, is an expensive and non-abundant resource, and it has poor durability for ORR activity. Therefore, metal-free carbon nanomaterials have been developed as alternative platinum catalysts. Nitrogen-doped carbon nanomaterials …. |
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Although carbon nanotube fibers (CNTFs) and carbon nanotube yarns (CNTYs), which have attracted attention as electrode materials in the fields of sensing, wearable devices, and electrochemical batteries, are not only lightweight but also possess excellent flexibility, their tensile strength and elastic modulus are inferior to those of conventional carbon fibers owing to the interfacial slip caused by weak interactions between adjacent nanotubes. In actuality, it is difficult …. |