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

A technology of electrocatalysis and porous carbon materials, which is applied in the preparation/purification of carbon, circuits, electrical components, etc., can solve the problems of insufficient research on oxygen reduction electrocatalysts for fuel cells, and achieve good cycle stability and anti-poisoning performance of impurities. The earth is rich in reserves and the flaky shape is beneficial to the effect

Active Publication Date: 2021-03-16
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-phosphorus doped porous carbon for oxygen reduction electrocatalysis in wide pH range
  • Preparation method of nitrogen-phosphorus doped porous carbon for oxygen reduction electrocatalysis in wide pH range
  • Preparation method of nitrogen-phosphorus doped porous carbon for oxygen reduction electrocatalysis in wide pH range

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Embodiment 1

[0059] Respectively, said coal and phosphate after taking pretreatment, diluted with water 4 ultrasonic mixing, particularly ultrasonic parameter is 25 Hz (5 min), 33 Hz (10 min), 40 Hz (5 min), 59 Hz: mass ratio of 1 (10 min), the total time 0.5h, then transferred to a drying tube furnace, min to 3 ℃ under a nitrogen atmosphere –1 Heating rate taken at 900 ℃ carbonized 1 h, after carbonization, the acid, filtered, washed with water, and drying to obtain a carbon-doped phosphorus P 4 C-900; mass ratio of 1: 4: 2 were weighed phosphorous doped carbon, potassium hydroxide and melamine, transferred to a tube furnace after trituration mixing, min to 3 ℃ under a nitrogen atmosphere –1 Heating rate of carbonization at 900 deg.] C 2 h, to give the secondary carbonization product; secondary carbonized product was 1mol L at 40-60 deg.] C –1 Dilute hydrochloric acid solution was 1-3 h, filtered, washed with water until the filtrate was neutral, and dried to obtain a porous carbon material P...

Embodiment 2

[0061] Mass ratio of 1: 4: 2, respectively, after taking said pretreated coal, melamine, potassium hydroxide, mixing after grinding was transferred to a tube furnace, min to 3 ℃ under a nitrogen atmosphere –1 Heating rate, taken after carbonization carbonized at 900 deg.] C 2 h, the acid, filtered, washed with water, and drying to obtain a carbon nitrogen-doped N 4 C-900; mass ratio of 1: 4 Weigh the nitrogen-doped carbon with phosphoric acid, diluted with water ultrasonic mixing, particularly ultrasonic parameter is 25 Hz (5 min), 33 Hz (10 min), 40 Hz (5 min) , 59Hz (10 min), the total time of 0.5 h, after drying was transferred to a tube furnace, min to 3 ℃ under a nitrogen atmosphere –1 Heating rate carbonized at 900 deg.] C 1 h, to give the secondary carbonization product; the second with 1 mol L carbonized product at 40-60 deg.] C –1 Dilute hydrochloric acid solution was 1-3 h, filtered, washed with water until the filtrate was neutral, and dried to obtain a porous carbon ma...

Embodiment 3

[0063] Mass ratio of 1: 4: 2, respectively, after taking said pretreated coal, melamine, potassium hydroxide, mixing after grinding was transferred to a tube furnace, min to 3 ℃ under a nitrogen atmosphere –1 Heating rate, taken after carbonization carbonized at 900 deg.] C 2 h, the acid, filtered, washed with water, and drying to obtain a carbon nitrogen-doped N 4 C-900; mass ratio of 1: 4 were weighed directly after mixing the nitrogen-doped carbon with phosphoric acid was transferred to a drying tube furnace, min to 3 ℃ under a nitrogen atmosphere –1 Heating rate carbonized at 900 deg.] C 1 h, to give the secondary carbonization product; the second with 1 mol L carbonized product at 40-60 deg.] C –1 Dilute hydrochloric acid solution was 1-3 h, filtered, washed with water until the filtrate was neutral, and dried to obtain a porous carbon material Phosphorus doped 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, which comprises the following steps: by using a natural mineral-based carbon source as a raw material, synthesizing in two paths by using a nitrogen-phosphorus sequential doping method. The method is high in cost benefit, and the preparation method is sustainable and can be used for large-scale production; and the variable-frequency ultrasonic mixing method ensures relatively high performance. The prepared nitrogen and phosphorus doped porous carbonhas dispersed sheet morphology, rich edges and defects, large specific surface area and pore volume, sufficient micropores and mesopores and a proper amount of doped nitrogen and doped phosphorus, shows good electrochemical catalytic performance in alkaline electrolyte, acidic electrolyte and neutral electrolyte as an oxygen reduction reaction electrocatalyst, has good micromolecule and methanol poisoning resistance, and has good application potential in alkaline fuel cells / metal-air cells, proton exchange membrane fuel cells (acidic electrolytes) and biofuel cells (neutral electrolytes).

Description

Technical field [0001] The present invention belongs to the field of electrochemistry and inorganic nano material, particularly relates to a method of preparing porous carbon broad pH range with the electrocatalytic reduction of oxygen doped nitrogen and phosphorus. Background technique [0002] A fuel cell is a device that can convert chemical energy into electrical energy, high conversion efficiency, pollutant generation of clean energy conversion device is extremely rare, and has long been considered one of the effective ways to deal with the development of global environmental problems and energy crisis. However, the cathode oxygen reduction reaction (ORR) slow kinetics remains a major obstacle to large-scale application of the fuel cell. Currently, platinum-based catalyst materials, and other precious metal-based catalyst materials plays a large role in the reaction rate accelerating cathode catalyst. However, the platinum-based material and the noble metal materials are oft...

Claims

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Application Information

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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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