Unlock instant, AI-driven research and patent intelligence for your innovation.

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

A graphene, molybdenum carbide technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of complex production process, troubled synthesis, high cost, simple process and enhanced dispersibility. , the effect of uniform distribution

Inactive Publication Date: 2017-12-26
JINING UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reduced graphene supported molybdenum carbide or tungsten catalyst and its preparation method and application
  • Reduced graphene supported molybdenum carbide or tungsten catalyst and its preparation method and application
  • Reduced graphene supported molybdenum carbide or tungsten catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
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 70.1mV dec -1 , Continuous operation 10h still maintains good stability.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of catalyst preparation, and specifically relates to a reduced graphene-supported molybdenum carbide or tungsten catalyst and its preparation method and application. A method for preparing a reduced graphene-loaded molybdenum carbide or tungsten catalyst, which includes the following steps: (1) using molybdenum- or tungsten-containing heteropoly acid, polymer conductor, and graphene as raw materials, and synthesizing the heteropoly acid through a one-pot method -Polymer conductor / reduced graphene composite material; (2) Under the protection of inert gas, heat treat at 700-1100°C for 2-5 hours, cool and pickle to obtain reduced graphene supported molybdenum carbide or tungsten catalyst. The preparation method of the catalyst is simple, and the existence of the unique structure greatly limits the agglomeration of molybdenum carbide or tungsten nanoparticles, enhances their dispersion, shows excellent electrolysis of water for hydrogen production, and can also be used in electrocatalytic oxygen reduction. , lithium-ion batteries and other energy storage and conversion research fields.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/08B01J27/22B01J35/10C25B1/04C25B11/06
CPCC25B1/04B01J21/18B01J27/22B01J37/08C25B11/091B01J35/60Y02E60/36
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