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Electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst and preparation method thereof

A transition metal and non-noble metal technology, which is applied in the field of electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst and its preparation, can solve the gap between catalytic activity and stability, and the inability to effectively separate the catalyst from the substrate material , poor conductivity of metal phosphides, etc., to achieve the effect of improving catalytic performance, improving catalyst performance, and improving catalytic activity

Pending Publication Date: 2020-09-15
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN 110904468 A discloses a preparation method of a cerium-doped phosphide composite material, which improves the water electrolysis performance of tungsten phosphide as a catalyst, but the catalyst preparation process requires base materials such as carbon fiber paper, nickel foam or copper foam. As a result, the catalyst cannot be effectively separated from the substrate material, thereby limiting the use of the catalyst, and the metal phosphide itself has poor conductivity, and there is still a large gap with platinum-based catalysts in terms of catalytic activity and stability.

Method used

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  • Electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst and preparation method thereof
  • Electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst and preparation method thereof
  • Electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 10 mmol cyclobutanecarboxylic acid, 0.01 mmol sodium hypophosphite, 10 mmol ethylenediamine, 15 mmol thiopropionamide and 23 mmol cobalt chloride were fully stirred in 30 mL deionized water for 6 h; the resulting mixed solution was placed in The solvothermal reaction was carried out in the reaction kettle, the reaction temperature was 120 °C, and the reaction time was 10 h; then the obtained reactant was dried, placed in a tube furnace, and the temperature was raised to 600 °C at a rate of 1 °C / min in a nitrogen atmosphere. and keep the temperature down to room temperature after 2 h; the product was taken out from the tube furnace, washed with 1M dilute hydrochloric acid, then washed with deionized water until neutral, and dried to obtain the electronegative heteroatom-transition metal co-doped carbon-based non- Noble metal electrocatalysts. The obtained product is marked as C-1, and the appearance of the catalyst is black powder, which is tested by ICP-AES (inductively...

Embodiment 2

[0032] Stir 10 mmol 5-methyl-2-pyrazinecarboxylic acid, 0.8 mmol potassium dihydrogen phosphate, 20 mmol sodium dicyanamide, 5 mmol methyl propyl disulfide and 10 mmol cobalt chloride in 30 mL ethanol 14 h; the resulting mixed solution was placed in a reactor for solvothermal reaction at a reaction temperature of 125 °C and a reaction time of 15 h; then the obtained reactant was dried and placed in a tube furnace at 2 °C in a nitrogen atmosphere The heating rate was increased to 540 °C / min, and the temperature was kept constant for 3 h and then lowered to room temperature; the product was taken out from the tube furnace, washed with 1M dilute hydrochloric acid, then washed with deionized water until neutral, and dried to obtain the electronegative impurity Atom-transition metal co-doped carbon-based non-noble metal electrocatalysts. The obtained product is marked as C-2, and the appearance of the catalyst is black powder, which is tested by ICP-AES (inductively coupled atomic ...

Embodiment 3

[0035] Stir 10 mmol 4-hydroxycyclohexanecarboxylic acid, 0.1 mmol melamine phosphate, 25 mmol methylamine, 15 mmol methyl thiocyanate and 20 mmol ferric acetate in 30 mL methanol for 3 h; place the resulting mixed solution in the reaction The solvothermal reaction was carried out in a kettle, the reaction temperature was 100 °C, and the reaction time was 12 h; then the obtained reactant was dried, placed in a tube furnace, and the temperature was raised to 800 °C at a rate of 0.5 °C / min in a nitrogen atmosphere, and After constant temperature for 0.5 h, it was lowered to room temperature; the product was taken out from the tube furnace, washed with 1M dilute hydrochloric acid, then washed with deionized water until neutral, and dried to obtain the electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst. The obtained product is marked as C-3, and the appearance of the catalyst is black powder, which is tested by ICP-AES (inductively cou...

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Abstract

The invention discloses an electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst and a preparation method thereof, and belongs to the field of new energy and electrocatalytic materials. The preparation method comprises the following steps: fully stirring and reacting a carbon source, a phosphorus source, a nitrogen source, a sulfur source and transitionmetal salt in a solvent, carrying out a solvothermal reaction, carrying out high-temperature carbonization treatment in a nitrogen atmosphere, and finally, carrying out acid washing and drying treatment to obtain the electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst. According to the catalyst, the phosphorus source, the nitrogen source and the sulfursource are introduced in situ in the molecular synthesis process to improve the metal loading capacity and dispersity effectively, the conductivity of the catalyst is greatly improved due to the existence of the carbon material, the interaction between phosphorus and a reaction intermediate is fully utilized to form surface receptor sites with proton receptors and hydrides, and high activity is caused. The preparation method of the catalyst is simple, easily available in raw materials, low in cost, easy to control in process, short in preparation period, high in yield and suitable for large-scale production.

Description

technical field [0001] The invention relates to an electronegative heteroatom-transition metal co-doped carbon-based non-noble metal electrocatalyst and a preparation method thereof, belonging to the field of new energy and electrocatalytic materials. Background technique [0002] The development of clean electrochemical energy conversion and storage technologies, such as fuel cells, metal-air batteries, and water electrolyzers, is ideal for addressing current energy security and environmental pollution issues. Oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) are the most critical electrochemical reactions for energy storage and conversion in these technologies. Although materials based on platinum, iridium, or ruthenium exhibit the highest activity in these electrochemical reactions, they cannot be applied on a commercial scale due to the scarcity and high cost of these precious metals. Therefore, highly active, low-co...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C25B1/04C25B11/06H01M4/90
CPCB01J27/24H01M4/9041H01M4/9083C25B1/04C25B11/04B01J35/33B01J35/615B01J35/617B01J35/618Y02E60/36Y02E60/50
Inventor 李开喜许菲菲
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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