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Preparation method of nitrogen and phosphorus doped porous carbon for oxygen reduction electrocatalysis in wide pH range

An electrocatalysis and phosphorus doping technology, which is applied in the preparation/purification of carbon, circuits, electrical components, etc., can solve the problems of insufficient research on oxygen reduction electrocatalysts in fuel cells, and achieve a simple and feasible preparation process and good flake morphology. Beneficial and low cost effect

Active Publication Date: 2022-04-26
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported research on oxygen reduction electrocatalysts for fuel cells is far from enough, especially the available non-noble metal catalyst materials in a wide pH range.

Method used

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  • Preparation method of nitrogen and phosphorus doped porous carbon for oxygen reduction electrocatalysis in wide pH range
  • Preparation method of nitrogen and phosphorus doped porous carbon for oxygen reduction electrocatalysis in wide pH range
  • Preparation method of nitrogen and phosphorus doped porous carbon for oxygen reduction electrocatalysis in wide pH range

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Embodiment 1

[0059] Weigh the pretreated coal and phosphoric acid according to the mass ratio of 1:4, add water to dilute and ultrasonically mix, the specific ultrasonic parameters are 25 Hz (5 min), 33 Hz (10 min), 40 Hz (5 min), 59 Hz (10 min), the total time is 0.5h, and then dried and transferred to a tube furnace, under a nitrogen atmosphere at 3 ℃ min –1 The heating rate was carbonized at 900 °C for 1 h, and after the carbonization was completed, it was taken out, pickled, filtered, washed with water, and dried to obtain phosphorus-doped carbon P 4 C-900: Weigh phosphorus-doped carbon, melamine and potassium hydroxide according to the mass ratio of 1:4:2, grind and mix them, transfer them to a tube furnace, and heat them at 3 °C min under a nitrogen atmosphere. –1 The heating rate was carbonized at 900 ℃ for 2 h to obtain the secondary carbonized product; the secondary carbonized product was mixed with 1mol L –1 Pickle with dilute hydrochloric acid solution for 1-3 h, filter, wash w...

Embodiment 2

[0061] The pretreated coal, melamine and potassium hydroxide were weighed at a mass ratio of 1:4:2, ground and mixed, transferred to a tube furnace, and heated at 3 °C for min under a nitrogen atmosphere. –1 The heating rate was carbonized at 900 °C for 2 h, and after the carbonization was completed, it was taken out, pickled, filtered, washed with water, and dried to obtain nitrogen-doped carbon N 4 C-900; Nitrogen-doped carbon and phosphoric acid were weighed at a mass ratio of 1:4, diluted with water and mixed ultrasonically. The specific ultrasonic parameters were 25 Hz (5 min), 33 Hz (10 min), 40 Hz (5 min) , 59Hz (10 min), total time 0.5 h, post-dried and transferred to tube furnace, 3 ℃ min under nitrogen atmosphere –1 The heating rate was carbonized at 900 ℃ for 1 h to obtain the secondary carbonized product; the secondary carbonized product was mixed with 1 mol L –1 Pickle with dilute hydrochloric acid solution for 1-3 h, filter, wash with water until the filtrate is...

Embodiment 3

[0063] The pretreated coal, melamine and potassium hydroxide were weighed at a mass ratio of 1:4:2, ground and mixed, transferred to a tube furnace, and heated at 3 °C for min under a nitrogen atmosphere. –1 The heating rate was carbonized at 900 °C for 2 h, and after the carbonization was completed, it was taken out, pickled, filtered, washed with water, and dried to obtain nitrogen-doped carbon N 4 C-900; Weigh nitrogen-doped carbon and phosphoric acid according to the mass ratio of 1:4, mix them directly, dry them and transfer them to a tube furnace. –1 The heating rate was carbonized at 900 ℃ for 1 h to obtain the secondary carbonized product; the secondary carbonized product was mixed with 1 mol L –1 Pickle with dilute hydrochloric acid solution for 1-3 h, filter, wash with water until the filtrate is neutral, and dry to obtain nitrogen and phosphorus doped porous carbon material N 4 P 4 C-900-d.

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Abstract

The invention discloses a preparation method of nitrogen-phosphorus-doped porous carbon for oxygen reduction electrocatalysis in a wide pH range. The natural mineral-based carbon source is used as a raw material, and the "nitrogen-phosphorus sequential doping method" is used for synthesis in two ways. The invention has high cost-effectiveness, and the preparation method is sustainable and scalable; the frequency conversion ultrasonic mixing method ensures higher performance. The as-prepared nitrogen-phosphorus-doped porous carbon has dispersed sheet-like morphology, abundant edges and defects, large specific surface area and pore volume, sufficient micropores and mesopores, and appropriate amount of doped nitrogen and phosphorus, as oxygen The reduction reaction electrocatalyst shows good electrochemical catalytic performance in alkaline electrolyte, acidic electrolyte and neutral electrolyte, and has good resistance to small molecules and methanol poisoning. It has good application potential in batteries, proton exchange membrane fuel cells (acid electrolyte) and biofuel cells (neutral electrolyte).

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials and electrochemistry, and in particular relates to a preparation method of nitrogen-phosphorus-doped porous carbon for oxygen reduction electrocatalysis in a wide pH range. Background technique [0002] Fuel cell is a clean energy conversion device that can convert chemical energy into electrical energy with high conversion efficiency and very little pollutant generation. It has long been considered as one of the effective development methods to deal with global environmental problems and energy crisis. However, the slow kinetics of the cathode oxygen reduction reaction (ORR) remains a major obstacle for the large-scale application of fuel cells. At present, platinum-based catalyst materials and other noble metal-based catalyst materials play a larger role in accelerating the rate of cathodic catalytic reactions. However, platinum-based materials and precious metal materials often hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/96
CPCC01B32/05H01M4/96Y02E60/50C01P2002/70C01P2002/82C01P2002/85C01P2004/03C01P2004/04C01P2006/12C01P2006/14C01P2006/40
Inventor 徐朗齐佳伟白沛瑶刘伟琪金柏霖张文都
Owner CHINA UNIV OF MINING & TECH
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