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Graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalytic hydrogen production catalyst and preparation method thereof

A graphene-wrapped, molybdenum carbide technology, applied in circuits, electrical components, battery electrodes, etc., can solve problems such as difficulty in achieving highly uniformly dispersed ultra-fine nanostructures, affecting the activity of electrocatalysts, and collapse of catalyst pore structures. Achieve the effect of improving the activity and stability of electrocatalytic hydrogen production, reducing overpotential, and abundant sources

Inactive Publication Date: 2019-01-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a variety of synthesis methods reported at this stage have certain limitations. Molybdenum carbide (MoC x ) synthesis process inevitably uses high temperature (~900°C), which will cause molybdenum carbide (MoC x ) particles sintering and agglomeration, it is difficult to achieve a highly uniformly dispersed ultrafine nanostructure; in addition, high synthesis temperature will cause the collapse of the pore structure of the catalyst, making the catalyst generally have a small specific surface area (2 / g)
The above technical bottlenecks severely restrict the exposure of active sites and the diffusion of reaction products and reactants in the electrocatalytic hydrogen production process of molybdenum carbide (MoCx) catalysts, which greatly affects the electrocatalysts of this type. Active play and wide application

Method used

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  • Graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalytic hydrogen production catalyst and preparation method thereof
  • Graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalytic hydrogen production catalyst and preparation method thereof
  • Graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalytic hydrogen production catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, Mo 3 (BTC) 2 (Mo-MOFs) As for the tube furnace, under the protection of argon, the temperature was programmed to 700 ℃ for carbonization for 5 hours, and the heating rate was controlled at 5 ℃ / min to prepare the graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalyst Hydrogen production catalyst. Such as figure 1 Shown: The as-prepared electrocatalytic hydrogen production catalyst consists of ultra-dispersed nano-MoC (~3 nm) wrapped by 1~3 layers of graphene; as figure 2 Shown: the catalyst has a large specific surface area (187 m 2 / g) and abundant dual-pore structure (3~4 nm and 20~300 nm).

[0022] The electrochemical test of the ultra-dispersed nano-molybdenum carbide electrocatalytic hydrogen production catalyst wrapped by graphene is carried out in the following steps:

[0023] (a) Weigh 15 mg of the graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalytic hydrogen production catalyst and disperse it in a solution c...

Embodiment 2

[0026] Embodiment 2, Mo 3 (BTC) 2 (Mo-MOFs) As for the tube furnace, under the protection of argon, the temperature was programmed to 800 ℃ for 5 hours, and the heating rate was controlled at 5 ℃ / min, and the graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalyst Hydrogen production catalyst.

[0027] The electrochemical test of the prepared graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalytic hydrogen production catalyst is the same as the steps (a) and (b) of the implementation case 1.

[0028] The electrocatalyst exhibited high hydrogen evolution activity in acidic conditions with a current density of -10 mA / cm 2 The overpotential under the conditions is 159 mV.

Embodiment 3

[0029] Embodiment 3, Mo 3 (BTC) 2 (Mo-MOFs) As for the tube furnace, under the protection of argon, the temperature was programmed to 900 °C for 5 hours, and the heating rate was controlled at 5 °C / min, and the graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalyst Hydrogen production catalyst.

[0030] The electrochemical test of the prepared graphene-wrapped ultra-dispersed nanomolybdenum carbide electrocatalytic hydrogen production catalyst is the same as the steps (a) and (b) of the implementation case 1.

[0031] The electrocatalyst exhibited high hydrogen evolution activity in acidic conditions with a current density of -10 mA / cm 2 The overpotential under the conditions is 185 mV.

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Abstract

The invention belongs to the technical field of electro-catalysis hydrogen production, and particularly relates to a graphene wrapped ultra-dispersed nano molybdenum carbide electro-catalysis hydrogen producing catalyst and a preparation method thereof. The catalyst comprises 1-10 layers of graphene wrapped ultra-dispersed nano MoC (1-20 nano), and has very large specific surface area (100-300m2 / g) and rich dual hole structure (3-4 and 20-500 nano). The preparation method comprises following step of with Mo3(BTC)2 as a hybridization precursor, carbonizing at 500-1000DEG C under the protection of argon so as to prepare the graphene wrapped ultra-dispersed nano molybdenum carbide electro-catalysis hydrogen producing catalyst, wherein the temperature rising rate of the carbonization is controlled at 1-80 DEG C per minute, and the carbonization time is 0.5-24 hours. The catalyst has very high electro-catalysis hydrogen producing activity and stability under the acid condition and the alkaline condition. The raw material used in preparation is cheap, the preparation method is mature and stable, is simple to operate, has high controllability, and is applicable to large scale production and hydrogen production through water electrolysis in industry.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic hydrogen production, and in particular relates to a graphene-wrapped ultra-dispersed nano molybdenum carbide electrocatalytic hydrogen production catalyst and a preparation method thereof. Background technique [0002] With the continuous increase of the world's population and the continuous progress of social development, human demand for energy is increasing day by day. Nowadays, with the gradual depletion of traditional fossil energy such as oil and coal and the deteriorating environmental problems, the traditional "fossil energy-based energy structure system" is facing unprecedented challenges and crises. Hydrogen has the advantages of the highest energy density, excellent combustion performance, clean and pollution-free, making it the best alternative green energy for traditional fossil energy. However, the utilization of hydrogen energy largely depends on the development of hydroge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/96Y02E60/50
Inventor 唐颐石张平王洋霞张亚红
Owner FUDAN UNIV
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