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A kind of tungsten carbide/porous carbon composite material and its preparation method and application in electrochemical hydrogen production

A composite material, tungsten carbide technology, used in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of easy aggregation of catalysts, weak force, decreased catalytic activity, etc., to achieve enhanced The effect of hydrogen production efficiency, increased stability, and improved purity

Active Publication Date: 2020-05-05
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of electrochemical catalytic hydrogen production, there is a problem of weak force between the existing catalyst and the catalyst carrier, and the catalysts, especially the catalyst nanoparticles, are easy to aggregate with each other, which leads to a decrease in catalytic activity.

Method used

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  • A kind of tungsten carbide/porous carbon composite material and its preparation method and application in electrochemical hydrogen production
  • A kind of tungsten carbide/porous carbon composite material and its preparation method and application in electrochemical hydrogen production
  • A kind of tungsten carbide/porous carbon composite material and its preparation method and application in electrochemical hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] According to the ratio of zinc to tungsten molar ratio of 4:1 (1 mmol in total), zinc acetate and tungstic acid were weighed and dissolved in 4ml of N,N-dimethylformamide solution; 0.096 g of dimethylimidazole was added, ultrasonically After it dissolves evenly, pour this mixed solution into a 25ml polytetrafluoroethylene reactor, put it in an oven, and keep it at 160 degrees Celsius for 48 hours. After the reactor is naturally cooled to room temperature, there is a light yellow color at the bottom of the reactor. The precipitate was separated out, and was centrifuged and washed with ethanol several times until the obtained supernatant became colorless and transparent, and the light yellow precipitate was dried to obtain a roasted precursor. Weigh an appropriate amount of roasted precursor and place it in a roasting crucible, and place the crucible in a tube furnace. The tube furnace was evacuated with a pump, fed with high-purity argon, heated to 900°C at a heating rat...

Embodiment 2

[0076] Weigh zinc nitrate and phosphotungstic acid according to the molar ratio of zinc and tungsten being 4:1 (total 1 mmol), and dissolve in 2 ml of N,N-dimethylformamide, 1 ml of ethylene glycol and 1 Add 0.064 g of dimethylimidazole to the mixed solution composed of 1 ml of ethanol, ultrasonically wait until it dissolves evenly, put the above mixed solution into an oven at 120 degrees Celsius and keep it for 72 hours, then wait for it to cool naturally to room temperature, and put it in the bottom of the reaction bottle A light yellow precipitate was precipitated, and was centrifuged and washed with ethanol for several times until the obtained supernatant became colorless and transparent, and the light yellow precipitate was dried to obtain a roasted precursor. Weigh an appropriate amount of roasted precursor and put it in the roasting crucible, and put the crucible in the tube furnace, pump the tube furnace into a vacuum, feed high-purity nitrogen, and use 2°C / min to heat ...

Embodiment 3

[0078] Weigh zinc nitrate and phosphotungstic acid according to the molar ratio of zinc and tungsten being 4:1 (1 mmol in total), and dissolve them in a mixed solution consisting of 2 ml of ethylene glycol and 1 ml of ethanol, and add 0.064 g Dimethylimidazole, ultrasonically until it dissolves evenly, put the above mixed solution in an oven at 120 degrees Celsius and keep it for 72 hours, then wait for it to cool to room temperature naturally, a light yellow precipitate precipitates out at the bottom of the reaction bottle, and wash with ethanol several times by centrifugation, Until the obtained supernatant becomes colorless and transparent, the light yellow precipitate is dried to obtain a roasted precursor. Weigh an appropriate amount of roasted precursor and put it in the roasting crucible, and put the crucible in the tube furnace, pump the tube furnace into a vacuum, feed high-purity nitrogen, and use 2°C / min to heat up rate, to 1000 degrees Celsius, and keep it for 300 ...

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Abstract

The invention discloses a tungsten carbide / porous carbon composite material and a preparation method thereof and application of the tungsten carbide / porous carbon composite material in electrochemicalhydrogen production. The tungsten carbide / porous carbon composite material has a nanometer size effect and high porosity, tungsten carbide and foreign-atom-doped porous carbon materials are tightly bound and can be synergistically catalyzed, stability is improved, and therefore, the composite material exhibits good catalytic properties in the electrochemical hydrogen production process and good stability of which the precious metal does not have, and efficient utilization of energy is realized. The preparation method has a simple preparation process, and adopts abundant tungsten in the natureas a raw material, thereby realizing effective utilization of tungsten resources.

Description

technical field [0001] The invention mainly relates to the technical field of electrochemical hydrogen production, in particular to a tungsten carbide / porous carbon composite material, a preparation method thereof and an application in electrochemical hydrogen production. Background technique [0002] With the depletion of traditional fossil fuel (coal, oil, natural gas) resources, looking for new renewable clean energy has become the main research topic. Due to its high energy density per unit mass, hydrogen molecules only produce water, a non-polluting product in the process of releasing energy, so they are a kind of clean energy with great potential, and the exploration of hydrogen production and storage has also been in progress. [0003] Electrochemical hydrogen production is considered to be an effective method for producing hydrogen. Among them, platinum is currently recognized as the most effective catalyst in the process of electrochemical catalytic hydrogen produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22C25B1/04C25B11/04
CPCB01J27/22B01J35/0033B01J35/02B01J35/1004B01J35/1019B01J35/1033B01J35/1038C25B1/04C25B11/091Y02E60/36
Inventor 李扬毋欣张华彬康遥张健
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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