Method for loading nitride to graphite nano-sheet and application of graphite nano-sheet
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A nanosheet and nitride technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of high production cost, easy agglomeration, large particle size, etc., and achieve low cost, reaction Mild conditions, evenly distributed effects
Inactive Publication Date: 2014-02-26
HEILONGJIANG UNIV
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[0004] In order to solve the technical problems of large particle size, easy agglomeration and high production cost of existing nitride materials, the present invention provides a method for loading nitrides on graphite nano flakes
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specific Embodiment approach 1
[0027] Specific embodiment 1: The method of loading nitride on the graphite nanoflake in this embodiment is carried out in the following steps:
[0028] 1. Weigh 0.3-6 parts by weight of tungsten source, molybdenum source or vanadium source, 1 part of expandable graphite, 0.05-0.6 parts of surfactant and 50-100 parts of solvent;
[0029] 2. Put the expandable graphite into a high-temperature furnace and continue to pass N 2 Or Ar gas is used as the protective gas, and then the temperature is raised to 700°C to 1100°C, heat treated for 1 min to 10 minutes, and then cooled to room temperature to obtain expanded graphite;
[0030] 3. Dissolve the tungsten source, molybdenum source or vanadium source and surfactant weighed in step 1 in the solvent weighed in step 1, and sonicate for 15 min under the condition of ultrasonic power of 100W to obtain a uniformly mixed precursor;
[0031] 4. Put the expanded graphite obtained in step 2 into a vacuum filtration device, and inject the precursor p...
specific Embodiment approach 2
[0040] Specific embodiment two: this embodiment is different from specific embodiment one in that in step one, 3 parts of tungsten source, molybdenum source or vanadium source, 1 part of expandable graphite, 0.3 parts of surfactant are weighed in parts by weight And 60 parts of solvent. Others are the same as the first embodiment.
specific Embodiment approach 3
[0041] Specific embodiment three: This embodiment is different from specific embodiment one or two in that in step two, the temperature is raised to 800°C to 1000°C, and the heat treatment is performed for 3min to 8min. Others are the same as the first or second embodiment.
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Abstract
The invention discloses a method for loading nitride to a graphite nano-sheet and an application of the graphite nano-sheet, relates to a method for loading nitride and an application of the method and aims at solving technical problems that existing nitride materials are large in size, high in production cost, easy to agglomerate and the like. The method includes step one, preparing expanded graphite; step two, dissolving a tungsten source, a molybdenum source, a vanadium source and a surface active agent in a solvent to prepare a disperse system; step three, injecting the disperse system into expanded graphite layers with the assistance of vacuum pressure; step four, evaporating the solvent to dryness; step five, placing a product obtained from step four in a crucible, and heating the crucible by using a high temperature impulse microwave technology to obtain an oxide / graphite nano-sheet complex; and step six, placing the oxide / graphite nano-sheet complex in a tube furnace, and feeding nitriding gases to obtain the nitride / graphite nano-sheet complex. The method is simple and mild in reaction conditions, particle sizes of obtained nitride are small, the nitride is evenly distributed on graphite sheet surfaces and in layers, and the graphite nano-sheet can be used in low platinum fuel cells after precious metals are loaded to the graphite nano-sheet.
Description
Technical field [0001] The invention relates to a method for loading nitrides on graphite nano flakes and uses thereof. Background technique [0002] Fuel cell is an efficient and environment-friendly energy conversion device. Platinum-based precious metals are typical catalysts for fuel cells, but their high prices and scarce resources restrict the commercialization of fuel cells. In addition, the platinum-based precious metal cathode O 2 The reduction electrocatalytic reaction kinetics is slow; the anode electrooxidation reaction is prone to CO poisoning on the surface of the catalyst, which leads to the reduction of catalyst activity and service life. [0003] Transition metal tungsten nitride (molybdenum, vanadium) has similar catalytic properties, good electrical conductivity, electrochemical stability and CO poisoning resistance to platinum-based precious metals. It is a new type of catalyst carrier that is beneficial to improve the anode and cathode of precious metal cataly...
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