Reduced graphene supported molybdenum or tungsten carbide catalyst and preparation method and application thereof

A technology of graphene and molybdenum carbide, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of complex production process, troubled synthesis, high cost, etc., and achieve simple process and enhanced dispersion , evenly distributed effect

Inactive Publication Date: 2016-05-11
JINING UNIV
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  • Application Information

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Problems solved by technology

Among them, transition metal sulfides, carbides and other materials have particularly remarkable electrocatalytic properties for hydrogen evolution reaction, but most of the materials have complex manufacturing processes, high cost, low yield, and problems such as agglomeration of nanoparticles and low-density active centers during the synthesis process. The existence still plagues the synthesis of such materials

Method used

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  • Reduced graphene supported molybdenum or tungsten carbide catalyst and preparation method and application thereof
  • Reduced graphene supported molybdenum or tungsten carbide catalyst and preparation method and application thereof
  • Reduced graphene supported molybdenum or tungsten carbide catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The preparation of phosphomolybdic acid-polypyrrole / reduced graphene: first 25mL graphene aqueous solution (1mg / mL) is mixed with 300mL (7.3g / L) phosphomolybdic acid aqueous solution; Add the aqueous solution of 25mL pyrrole ( 17mg / mL). Then, it was continuously stirred at 60° C. for 24 h, and the product was obtained by suction filtration, washed several times with distilled water, and dried.

[0027] The preparation method of reduced graphene-supported molybdenum carbide or tungsten catalyst: 2g of phosphomolybdic acid-polypyrrole / reduced graphene was heat-treated at 900°C for 5h under the protection of high-purity nitrogen, cooled and pickled to obtain the final required sample.

[0028] The SEM photographs of the obtained samples are shown in figure 2 , it can be seen from the figure that the surface of the wrinkled reduced graphene is relatively rough; the TEM photos are shown in Figure 3(a)-(b), and it can be seen from the figure that the prepared nanoparticles ...

Embodiment 2

[0030] The preparation process and steps in this example are basically the same as those in Example 1 above, except that the calcination temperature is adjusted from 900°C to 1100°C. The SEM and TEM photos of the obtained samples are shown in Figure 4(a)-(b). Its electrolytic water hydrogen production (hydrogen evolution) performance is: the initial potential is 27mV (relative to the standard hydrogen electrode), and the Tafel slope is 70.1mVdec -1 , Continuous operation 10h still maintains good stability.

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Abstract

The invention belongs to the technical field of preparation of catalysts and particularly relates to a reduced graphene supported molybdenum or tungsten carbide catalyst and a preparation method and application thereof. The preparation method of the reduced graphene supported molybdenum or tungsten carbide catalyst comprises the following steps: (1), synthesizing a heteropolyacid-polymer conductor / reduced graphene composite through a one-pot reaction method by using molybdenum- or tungsten-containing heteropolyacid, a polymer conductor and graphene as raw materials; (2), under the protection of an inert gas, thermally treating at 700-1100 DEG C for 2-5 h, and cooling and pickling to obtain the reduced graphene supported molybdenum or tungsten carbide catalyst. The preparation method of the catalyst is simple, the presence of a unique structure provides a great limitation on the agglomeration of molybdenum or tungsten carbide nanoparticles and an enhancement in their dispersity, excellent hydrogen production from water electrolysis is shown, and the preparation method is also applicable to the fields of studies such as energy storage and conversion studies for electrocatalytic reduction of oxygen, lithium ion batteries and the like.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a reduced graphene supported molybdenum carbide or tungsten catalyst and its preparation method and application. Background technique [0002] Hydrogen is a green, efficient and clean energy that can replace fossil fuels. Large-scale, low-cost preparation and storage of hydrogen has important research significance. Among them, electrolysis of water for hydrogen production (hydrogen evolution) is an efficient and environmentally friendly hydrogen production method, but the required platinum-based catalyst is expensive and the production cost is high, which limits the industrial production of this technology. Therefore, research and construction of non-precious metal electrocatalysts with high efficiency and low production cost to reduce the overpotential is the key to improving the catalytic efficiency of hydrogen evolution reaction. In recent years, rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/08B01J27/22B01J35/10C25B1/04C25B11/06
CPCB01J21/18B01J27/22B01J35/10B01J37/08C25B1/04C25B11/091Y02E60/36
Inventor 李继森兰亚乾李顺利盛宁刘国栋司崇殿王宇光张海峰孔亚杰
Owner JINING UNIV
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