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Method for nickel-assisted low-temperature synthesis of molybdenum carbide electrocatalyst

An electrocatalyst, molybdenum carbide technology, applied in physical/chemical process catalysts, chemical instruments and methods, carbides, etc., to achieve the effects of good social and economic benefits, simple synthesis process, and low equipment requirements

Active Publication Date: 2017-07-07
中国科学院上海硅酸盐研究所苏州研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inevitable agglomeration process or overgrowth of MoC materials at high temperature during the preparation process, as well as the partial oxidation of the MoC surface, it is still a challenge to prepare highly dispersed MoC nanostructures.

Method used

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  • Method for nickel-assisted low-temperature synthesis of molybdenum carbide electrocatalyst
  • Method for nickel-assisted low-temperature synthesis of molybdenum carbide electrocatalyst
  • Method for nickel-assisted low-temperature synthesis of molybdenum carbide electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Choose 2-methylimidazole as the reducing carbon source, weigh 2-methylimidazole 1g, and ammonium heptamolybdate ((NH 4 ) 6 Mo 7 o 24 .4H 2 O) 0.5g, NiCl 2 .6H 2 O 0.22g in a beaker, add 20mL of water, ultrasonically dissolve, stir at room temperature (25°C) for 24h, wash the light green product with water, centrifuge, and dry. The dried product was calcined to 650° C. under Ar atmosphere, kept for 4 h, and then the calcined product was treated with dilute acid (specifically, 0.5M H 2 SO 4 solution acid) soaked for 24 hours to remove unstable species in the catalyst, and finally centrifuged and washed to neutrality, then dried, and the resulting product was recorded as MoC x / Ni-650.

[0037] The electrochemical test of the electrolysis of water to produce hydrogen by the nickel-assisted molybdenum carbide catalyst was carried out in the following steps:

[0038] First, weigh 4mg of the above catalyst and disperse it in a mixed solution containing 1mL of absolut...

Embodiment 2

[0040] The preparation process and steps in Example 2 are basically the same as those in Example 1 above, except that the selected calcination temperature is 500°C, and the prepared catalyst is denoted as MoC x / Ni-500. The catalytic performance of the catalyst for hydrogen production by electrolysis of water is the same as in Example 1.

Embodiment 3

[0042] Preparation process and steps in embodiment 3 are basically the same as above-mentioned embodiment 1, and difference is: the selected calcination temperature is 550 ℃, and the catalyst prepared is denoted as MoC x / Ni-550. The catalytic performance of the catalyst for hydrogen production by electrolysis of water is the same as in Example 1.

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Abstract

The invention relates to a method for nickel-assisted low-temperature synthesis of a molybdenum carbide electrocatalyst. The method comprises the steps that a carbon source, a nickel source and a molybdenum source are added into water, and ultrasonic dissolution is performed to obtain a mixed solution; then the obtained mixed solution reacts at the temperature of 15-30 DEG C for 4-48 hours, and centrifugal washing and drying are performed to obtain a light green product; the obtained light green product is arranged in a protective atmosphere and is calcined at the temperature of 500-750 DEG C for 2-10 hours, and then acid pickling is performed to obtain the molybdenum carbide electrocatalyst. The carbon source is selected from imidazole group organic matter or / and organic matter providing nitrogen-atom coordination, and the molybdenum source is selected from at least one of ammonium heptamolybdate, sodium molybdate and potassium molybdate. The molybdenum carbide nano-structure synthesis method is simple in process, economic, reasonable, environmentally friendly and low in synthesis temperature and makes large-scale production easy.

Description

technical field [0001] The invention relates to a method for synthesizing a molybdenum carbide electrocatalyst with one-step low temperature aided by nickel, and belongs to the technical fields of energy catalytic materials and hydrogen preparation. Background technique [0002] As an efficient and clean energy, hydrogen is the most ideal energy to replace fossil energy in the future. Hydrogen production by electrolysis of water is an ideal hydrogen production method with high efficiency and environmental protection. Currently, the most ideal platinum-based noble metal catalyst is expensive and limited in resources, which limits its industrial application. Therefore, finding and discovering efficient and inexpensive non-precious metal electrocatalysts is the key to hydrogen production from water electrolysis. Currently, β-Mo 2 C is one of the best non-precious metal electrocatalysts that has been extensively studied in recent years due to its good electrical conductivity,...

Claims

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Application Information

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IPC IPC(8): B01J27/22C01B32/949C25B1/04
CPCC25B1/04B01J27/22C01P2004/64C01P2006/40C01P2004/03B01J35/33B01J35/40Y02E60/36
Inventor 周亚君张玲霞施剑林
Owner 中国科学院上海硅酸盐研究所苏州研究院
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