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Preparation method of N-P-codoping porous biomass carbon catalyst

A biomass carbon, co-doping technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of unreasonable utilization of biomass resources, adjustable and uniform catalysts It has problems such as poor performance and difficult to control stability, and achieves the effect of good industrial application prospects, good resistance to methanol poisoning and stability.

Active Publication Date: 2017-06-23
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the controllability and uniformity of the obtained catalyst poor, and the stability is difficult to control
On the other hand, a large number of biomass resources in the world are not rationally utilized every year, and a considerable part of them even decays and become environmental pollutants.

Method used

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  • Preparation method of N-P-codoping porous biomass carbon catalyst
  • Preparation method of N-P-codoping porous biomass carbon catalyst
  • Preparation method of N-P-codoping porous biomass carbon catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Catalyst 50%P(Ph) 3 Preparation of -800-0.5-1

[0030] a. Preparation of doping material: ultrasonically dissolve 1.0g chitosan in 30mL 0.5M FeCl 3 In the solution, stir magnetically at 50°C for 6h, add 0.5g of triphenylphosphine, stir magnetically until uniformly dispersed, place the mixture in a 50mL polytetrafluoroethylene liner, react hydrothermally at 140°C for 20h, and filter out The solid was washed 3 to 5 times with deionized water, centrifuged and dried in vacuum for 12 hours to obtain 0.68 g of doped material.

[0031] b. 50%P(Ph) 3 - Preparation of 800-0.5-1: Grinding the dopant material obtained in the above a. and mixing it with 0.68g ZnCl 2 (mass ratio 1:1) mixed, then carbonized at 800°C for 1h in a nitrogen atmosphere, and the resulting carbon material was refluxed with 1M HCl at 60°C for 2h to remove excess ZnCl 2 , the resulting product was washed with deionized water, centrifuged, dried overnight, and ground to obtain 50% P(Ph) 3 -800-0.5-1 Bi...

Embodiment 2

[0035] 1. Catalyst 50%P(Ph) 3 Preparation of -900-0.5-1

[0036] a. Preparation of doping material: ultrasonically dissolve 1.0g chitosan in 30mL0.5MFeCl 3 In the solution, stir magnetically at 50°C for 6h, add 0.5g of triphenylphosphine, stir magnetically until uniformly dispersed, place the mixture in a 50mL polytetrafluoroethylene liner, react hydrothermally at 140°C for 20h, and filter out The solid was washed 3 to 5 times with deionized water, centrifuged and dried in vacuum for 12 hours to obtain 0.60 g of doped material.

[0037] b. 50%P(Ph) 3 -Preparation of 900-0.5-1: Grind the doped material obtained in above a and mix with 0.60g ZnCl 2 (1:1) mixed, then carbonized at 900°C for 1h in a nitrogen atmosphere, and the resulting carbon material was refluxed with 1M HCl at 60°C for 2h to remove excess ZnCl 2 , the resulting product was washed with deionized water, centrifuged, dried overnight, and ground to obtain 50% P(Ph) 3 -900-0.5-1 Biomass carbon material.

[00...

Embodiment 3

[0041] 1. Catalyst 100%P(Ph) 3 Preparation of -900-0.5-1

[0042] a. Preparation of doping material: ultrasonically dissolve 1.0g chitosan in 30mL0.5MFeCl 3 In the solution, stir magnetically at 50°C for 6h, add 1.0g of triphenylphosphine, stir magnetically until uniformly dispersed, place the mixture in a 50mL polytetrafluoroethylene liner, react hydrothermally at 140°C for 20h, and filter out The solid was obtained as a crude product, washed 3 to 5 times with deionized water, centrifuged and dried in vacuum for 12 hours to obtain 0.72 g of doped material.

[0043] b. 100%P(Ph) 3 The preparation of -900: with embodiment 2.

[0044] 2. Oxygen reduction test

[0045] Test condition and method are with embodiment 1, and test result is as Figure 8 shown. Depend on Figure 8 It can be seen that when the rotation speed of the rotating disk electrode is 1600rmp, the oxygen reduction onset potential is -0.122V.

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Abstract

The invention provides a preparation method of N-P-codoping porous biomass carbon catalyst. Cheap and easy-to-get biomass chitosan is taken as carbon source and nitrogen source (as nitrogen-containing ligand at the same time), organic phosphorus compound triphenylphosphine is taken as phosphorus-containing ligand, the nitrogen-containing ligand and the phosphorus-containing ligand form a coordination compound together with metal ions in metallic salt solution, ZnCl2 is taken as activating agent, the coordination compound is subjected to high-temperature pyrolysis in a nitrogen atmosphere to form holes, and finally diluted hydrochloric acid is used to remove metals for secondary hole formation, so as to prepare the N-P-codoping porous biomass carbon catalyst with rich micropores and a mesopores structure as well as a high specific surface area. The N-P-codoping porous biomass carbon catalyst is comparable to commercial Pt / C (20%) in catalytic performance in an alkaline environment, has good methanol poisoning resistance and stability, and can regulate components and performance of catalyst in molecular level. The N-P-codoping porous biomass carbon catalyst disclosed by the invention is expected to replace cathode oxygen reduction catalyst of the commercial Pt / C, and has a very good industrial application prospect.

Description

technical field [0001] The invention relates to the preparation of a nitrogen-phosphorus co-doped porous biomass carbon catalyst, which is mainly used as a cathode oxygen reduction reaction (ORR) catalyst of an alkaline fuel cell, and has certain application prospects in the technical field of methanol fuel cells. Background technique [0002] A fuel cell is an energy conversion device that directly converts chemical energy stored in fuel and oxidant into electrical energy, and is a green and recyclable energy technology. Alkaline fuel cell (AFC) is one of the earliest fuel cell systems developed and successfully applied. Because it can involve battery structures, materials, and electrical properties under various conditions such as different temperatures and fuels, it can be used in power supplies, portable power supplies for mobile electronic devices, and even in the aviation field. It is used on the American Apollo lunar spacecraft and space shuttle. Alkaline fuel cells ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J21/18H01M4/90
CPCB01J21/18B01J27/24H01M4/9083Y02E60/50
Inventor 童金辉马文梅王文慧李卿刘方方马江平李文艳
Owner NORTHWEST NORMAL UNIVERSITY
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