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Phosphorus-doped LaCoO3 bifunctional catalyst, and preparation method and application thereof

A bifunctional catalyst, phosphorus doping technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as poor catalytic activity, achieve uniform distribution, improve stability, and optimize electronics structure effect

Active Publication Date: 2018-12-18
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the LaCoO in the prior art 3 Defects and deficiencies of poor catalytic activity in alkaline solutions, providing a phosphorus-doped LaCoO 3 Preparation method of bifunctional catalyst

Method used

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  • Phosphorus-doped LaCoO3 bifunctional catalyst, and preparation method and application thereof
  • Phosphorus-doped LaCoO3 bifunctional catalyst, and preparation method and application thereof
  • Phosphorus-doped LaCoO3 bifunctional catalyst, and preparation method and application thereof

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Effect test

Embodiment 1

[0039] This embodiment provides a phosphorus-doped LaCoO 3 (LaCoO 3 -P) The bifunctional catalyst is prepared by the following method.

[0040] Weigh 0.02mol of lanthanum oxide and 0.02mol of cobalt tetroxide powder and mix them into the tungsten carbide ball milling tank. The mass ratio of the added tungsten carbide balls to the powder is 10:1. Under the condition of inert gas, seal the tungsten carbide ball milling tank. Preparation of highly active LaCoO by high energy ball milling at 900rpm for 3h 3 Perovskite materials;

[0041] Then the LaCoO synthesized in the previous step 3 Add 0.004mol red phosphorus to the perovskite material, seal the tungsten carbide ball mill jar under the condition of inert gas, and preliminarily prepare phosphorus-doped LaCoO by high-energy ball milling at a speed of 500rpm for 2.5h 3 Perovskite materials;

[0042] Finally, phosphorus-doped LaCoO was preliminarily prepared 3 In the perovskite material, the ratio of the mass of the isoprop...

Embodiment 2

[0049] This embodiment provides a phosphorus-doped LaCoO 3 (LaCoO 3 -P composite material) bifunctional catalyst, prepared by the following method.

[0050] Weigh 0.02mol of lanthanum oxide and 0.02mol of cobaltous oxide powder and mix them into a tungsten carbide ball milling jar. The mass ratio of the added tungsten carbide balls to the powder is 5:1. Under the condition of inert gas, seal the tungsten carbide ball milling jar. High activity LaCoO was prepared by high energy ball milling at 1000rpm for 2h 3 Perovskite materials;

[0051] Then the LaCoO synthesized in the previous step 3 Add 0.002mol red phosphorus to the perovskite material, seal the tungsten carbide ball mill jar under the condition of inert gas, and preliminarily prepare phosphorus-doped LaCoO by high-energy ball milling at a speed of 600rpm for 2 hours 3 Perovskite materials;

[0052] Finally, phosphorus-doped LaCoO was preliminarily prepared 3 In the perovskite material, the ratio of the mass of th...

Embodiment 3

[0055] This embodiment provides a phosphorus-doped LaCoO 3 (LaCoO 3 -P composite material) bifunctional catalyst, prepared by the following method.

[0056] Weigh 0.02mol of lanthanum oxide and 0.02mol of cobalt trioxide powder and mix them into the tungsten carbide ball milling jar. The mass ratio of the added tungsten carbide balls to the powder is 15:1. Under the condition of inert gas, seal the tungsten carbide ball milling jar. High-activity LaCoO was prepared by high-energy ball milling at 800 rpm for 4 h 3 Perovskite materials;

[0057] Then the LaCoO synthesized in the previous step 3 Add 0.005mol red phosphorus to the perovskite material, seal the tungsten carbide ball mill jar under the condition of inert gas, and preliminarily prepare phosphorus-doped LaCoO by high-energy ball milling at a speed of 400rpm for 3 hours 3 Perovskite materials;

[0058] Finally, phosphorus-doped LaCoO was preliminarily prepared 3 In the perovskite material, the ratio of the mass o...

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Abstract

The invention relates to a phosphorus-doped LaCoO3 bifunctional catalyst, and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing a LaCoO3 perovskite material with red phosphorus, and carrying out high-energy ball milling in an inert atmosphere so as to obtain a phosphorus-doped LaCoO3 perovskite material; and S2, adding a dispersant intothe phosphorus-doped LaCoO3 perovskite material, and carrying out ball milling and drying so as to obtain the phosphorus-doped LaCoO3 bifunctional catalyst. According to the invention, the high-energyball milling method is employed, and elemental oxygen in LaCoO3 is replaced through phosphorus doping, so the prepared phosphorus-doped LaCoO3 bifunctional catalyst has uniformly distributed elementary phosphorus, fine crystal grain and large specific surface area, is greatly improved in catalytic activity in an alkaline solution, shows excellent ORR and OER catalytic performance and high stability, and has great application prospects as a bifunctional catalyst in the field of electrocatalysis.

Description

technical field [0001] The invention belongs to the field of perovskite materials and electrochemical catalysis, in particular to a phosphorus-doped LaCoO 3 Bifunctional catalyst and its preparation method and application. Background technique [0002] Perovskite oxide materials are materials with calcium titanate (CaTiO 3 ) same ABO 3 A large class of compounds with a structure in which the A site is an alkaline earth element and the B site is a transition metal element. Due to this unique crystal structure, perovskite oxide materials have many unique physical and chemical properties, such as light absorption, electrocatalysis, electrical conductivity, giant magnetoresistance, etc., attracting many researchers in the fields of materials, energy, and nanometers. Among them, La-Co-O-based perovskite materials have received extensive attention in the field of electrocatalysis due to their superior catalytic activity. LaCoO 3 It can be used as a catalyst in the oxygen evol...

Claims

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Application Information

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IPC IPC(8): B01J27/185B01J35/02H01M4/90
CPCH01M4/9016B01J27/1853B01J35/33B01J35/50Y02E60/50
Inventor 沐杨昌施志聪陈远业王乃光刘钦豪
Owner GUANGDONG UNIV OF TECH
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