Method for loading nitride to graphite nano-sheet and application of graphite nano-sheet

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

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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

CN102773114AInactive Publication Date: 2012-11-14HEILONGJIANG UNIV

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specific Embodiment approach 1

[0027] Specific embodiment one: the method for loading nitride on the graphite nano flakes in this embodiment is carried out according to the following steps:

[0028] 1. Weigh 0.3-6 parts 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 in parts by weight;

[0029] 2. Put the expandable graphite into the high temperature furnace and continuously feed N 2 Or use Ar gas as a protective gas, then heat up to 700°C to 1100°C, heat treatment for 1min to 10min, and then cool 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 measured in step 1, and ultrasonicate for 15 minutes under the condition of ultrasonic power of 100W to obtain a uniformly mixed precursor;

[0031]4. Put the expanded graphite prepared in step 2 into a vacuum filtration device, and inject the...

specific Embodiment approach 2

[0040] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, 3 parts by weight of tungsten source, molybdenum source or vanadium source, 1 part of expandable graphite, and 0.3 parts of surfactant are weighed and 60 parts of solvent. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0041] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 2, the temperature is raised to 800° C. to 1000° C., and the heat treatment is performed for 3 minutes to 8 minutes. Others are the same as in 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 its application. Background technique [0002] A fuel cell is a highly efficient and environmentally friendly energy conversion device. Platinum group noble metals are typical catalysts for fuel cells, but due to high price and scarce resources, the commercialization of fuel cells is restricted. In addition, the platinum group noble metal cathode O 2 The reduction electrocatalytic reaction kinetics is slow; the anodic electrooxidation reaction is prone to CO poisoning on the surface of the catalyst, resulting in a decrease in catalyst activity and service life. [0003] Transition metal tungsten nitride (molybdenum, vanadium) has catalytic properties similar to platinum-based noble metals, good electrical conductivity, electrochemical stability and anti-CO poisoning properties. reactivity and stability. However, transition metal nitrides are easy to agglomerate at hi...

Claims

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Application Information

Patent Timeline

14 Nov 2012

Publication

CN102773114A

IPC: B01J27/24; B01J35/02; H01M4/92; B01J35/00

CPC: Y02E60/50

Inventors: 付宏刚; 王瑞红