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Heteroatom-doped carbon-load iron carbide/ molybdenum or tungsten carbide catalyst and preparation method and application thereof

A heteroatom, iron carbide technology, applied in the field of catalyst preparation, can solve the problems of active center troublesome synthesis, low density, etc., and achieve the effects of excellent electrocatalytic performance, uniform distribution, and easy process control.

Inactive Publication Date: 2016-05-04
JINING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the agglomeration of nanoparticles and low-density active centers still plague the synthesis of such materials during the synthesis process.

Method used

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  • Heteroatom-doped carbon-load iron carbide/ molybdenum or tungsten carbide catalyst and preparation method and application thereof
  • Heteroatom-doped carbon-load iron carbide/ molybdenum or tungsten carbide catalyst and preparation method and application thereof
  • Heteroatom-doped carbon-load iron carbide/ molybdenum or tungsten carbide catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of POMsMIL-100(Fe): Dissolve 3.2g of phosphomolybdic acid and 1.89g of ferric chloride hexahydrate in 50mL of distilled water, add 1.36g of trimethyl 1,3,5-benzene trihydroxyester, After reacting at ℃ for 72 hours, the obtained product was separated by centrifugation, and washed with ethanol and ether respectively.

[0028] The preparation method of heteroatom-doped carbon-supported iron carbide / molybdenum carbide samples: mix and grind POMsMIL-100(Fe) and melamine (1:3); , pickling, to obtain the final desired sample.

[0029] The TEM photos of the obtained samples are shown in Fig. 3(a)-(b), from which it can be seen that the prepared nanoparticles are relatively small in size and evenly distributed. Its electrolytic water hydrogen production (hydrogen evolution) performance is: the initial potential is 18mV (relative to the standard hydrogen electrode), and the Tafel slope is 45.2mVdec -1 , Continuous operation 10h still maintains good stability.

Embodiment 2

[0031] 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 1000°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 80mV (compared to the standard hydrogen electrode), and the Tafel slope is 59.2mVdec -1 , Continuous operation 10h still maintains good stability.

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Abstract

The present invention belongs to the technical field of catalyst preparation, and in particular relates to a heteroatom-doped carbon-load iron carbide / molybdenum or tungsten carbide catalyst and a preparation method and application thereof. The method comprises the following steps: (1) mixing molybdenum or tungsten heteropolyacid-containing @ metal-organic framework composite POMs @ MIL-100 (Fe) with melamine, and grinding; (2) under the protection of an inert gas, thermally treating at 800-1100 DEG C for 2-5h, cooling, and pickling with an acid to obtain heteroatom-doped carbon-load iron carbide / molybdenum or tungsten carbide. The preparation method of the catalyst is simple in process, agglomeration of molybdenum or tungsten carbide nanoparticles can be maximally restricted, by doping of hetero atoms, more active sites can be introduced, the hydrogen production property of the material by electrolysis is excellent, and the heteroatom-doped carbon-load iron carbide / molybdenum or tungsten carbide catalyst can be used in electro-catalytic oxygen reduction, lithium ion battery 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 heteroatom-doped carbon-loaded iron carbide / molybdenum carbide or tungsten catalyst and a preparation method and application thereof. Background technique [0002] In order to solve the energy crisis and environmental pollution problems, hydrogen energy has attracted widespread attention as the most promising energy source to replace petroleum fuels. Hydrogen production (hydrogen evolution) by electrolysis of water is the most economical and sustainable way of hydrogen production. At present, platinum or platinum-based catalysts are the best-performing hydrogen evolution catalysts, but their high price and limited reserves hinder their practical application. Therefore, the search for non-noble metal electrocatalysts with high efficiency and low production cost is the key to improve the efficiency of hydrogen evolution reaction. Researchers have found ...

Claims

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Application Information

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IPC IPC(8): B01J27/22C25B1/04C25B11/06
CPCB01J27/22C25B1/04C25B11/04Y02E60/36
Inventor 李继森李顺利兰亚乾盛宁刘国栋司崇殿王宇光陈万东
Owner JINING UNIV
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