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Preparation and application of phosphorus-doped cobalt telluride nano material

A technology of nanomaterials and phosphorus doping, which is applied in the fields of electrochemistry, composite materials and preparation, can solve the problems of large overpotential, etc., and achieve the effects of high conductivity, easy product structure and small batch difference

Active Publication Date: 2019-11-22
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these catalysts are limited by their own catalytic active area and the number of active sites, resulting in their large overpotential

Method used

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  • Preparation and application of phosphorus-doped cobalt telluride nano material
  • Preparation and application of phosphorus-doped cobalt telluride nano material
  • Preparation and application of phosphorus-doped cobalt telluride nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Co. 3 o 4 Preparation of nanosheets: Take 291 mg of Co(NO 3 ) 2 •6H 2 O and 300 mg urea were dissolved in 35 mL of deionized water and stirred for 30 minutes to form a homogeneous solution; the mixed solution was transferred to a 50 mL stainless steel autoclave lined with polytetrafluoroethylene, and hydrothermally reacted at 120 °C for 6 hours; the reaction After the end, the reactor was cooled to room temperature, and the precipitated product was washed with deionized water and ethanol for 3 to 4 times, and then dried in a vacuum oven at 60°C for 8 hours; °C (heating rate is 2 °C min -1 ) and calcined for 2 hours to obtain Co 3 o 4 Nanosheets;

[0033] (2) CoTe 2 Preparation of nanosheets: take the above synthesized Co 3 o 4 100 mg of nanosheets, and 200 mg of Te powder were ground evenly in a mortar, at 5°C min -1 The temperature was raised to 680°C and calcined for 2 hours to obtain CoTe 2 Nanosheets;

[0034] (3) P-CoTe 2 Preparation of nanopartic...

Embodiment 2

[0037] (1) Co. 3 o 4 Preparation of nanosheets: same as Example 1;

[0038] (2) CoTe 2 Preparation of nanosheets: same as Example 1;

[0039] (3) P-CoTe 2 Preparation of nanoparticles: 100 mg CoTe 2 The nanosheets and 200 mg of sodium hypophosphite were uniformly ground in a mortar, and the sample was heated to 300 °C in an Ar atmosphere (heating rate 2 °C min -1 ) and calcined for 120 minutes; then cooled to room temperature, the product was washed three times with deionized water and ethanol, and dried in a vacuum oven at 60°C for 4 hours to obtain P-CoTe 2 Nanoparticles;

[0040] (4) P-CoTe 2 Catalytic Hydrogen Evolution Performance Test of Nanoparticle Electrode: P-CoTe 2 Current density is 10mAcm in acidic environment -2 , the overpotential is 192mV; the current density is 10 mAcm in alkaline conditions -2 , the overpotential is 198mV.

Embodiment 3

[0042] (1) Co. 3 o 4 Preparation of nanosheets: same as Example 1;

[0043] (2) CoTe 2 Preparation of nanosheets: same as Example 1;

[0044] (3) P-CoTe 2 Preparation of nanoparticles: 100 mg CoTe 2 The nanosheets and 300 mg of sodium hypophosphite were ground evenly in a mortar, and the sample was heated to 300 °C in an Ar atmosphere (heating rate 2 °C min -1 ) and calcined for 120 minutes; then cooled to room temperature, the product was washed three times with deionized water and ethanol, and dried in a vacuum oven at 60°C for 4 hours to obtain P-CoTe 2 Nanoparticles;

[0045] (4) P-CoTe 2 Catalytic hydrogen evolution performance test of nanoparticle electrode: current density is 10 mAcm in acidic environment -2 , with an overpotential of 210mV and a current density of 10 mAcm in alkaline conditions -2 , the overpotential is 218mV.

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Abstract

The invention discloses a preparation method of a phosphorus-doped cobalt telluride nano material, which comprises the following steps: preparing cobalt hydroxide by using cobalt nitrate and urea as raw materials through a hydrothermal method, calcining to obtain Co3O4 nanosheets, grinding and mixing the Co3O4 nanosheets and tellurium powder, and calcining in an Ar atmosphere to obtain CoTe2 nanosheets; and finally, grinding and mixing the CoTe2 nanosheets and sodium hypophosphite, and calcining in Ar gas to obtain the phosphorus-doped CoTe2 nanoparticle material. According to the invention, phosphorus is doped, so electron cloud density of surrounding CoTe2 is changed, and favorable synergistic effect is generated to improve HER activity; the prepared P-CoTe2 nano-particle is of a porousstructure, is high in specific surface area and high in electrical conductivity, has stable and efficient catalytic hydrogen evolution performance in acidic and alkaline environments, and can be usedas an electrocatalyst for hydrogen evolution reaction by hydrolysis.

Description

technical field [0001] The invention relates to a preparation method of uniform phosphorus-doped cobalt telluride nanometer material, which can be used as a catalyst in the electrocatalytic hydrogen evolution reaction, and belongs to the field of composite materials and preparation technology and the field of electrochemical technology. Background technique [0002] With the use of fossil fuels, serious environmental pollution and energy crisis have been caused. Therefore, a clean energy source is needed to replace fossil energy sources, and hydrogen energy has attracted people's attention as an efficient and friendly clean energy source. There are many sources of hydrogen energy, and electrolysis of water to produce hydrogen is an efficient and pollution-free way. However, the water electrolysis process is energy-intensive, so designing efficient hydrogen evolution (HER) catalysts is crucial to accelerate the reaction kinetics and greatly reduce the overpotential. Platinu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J35/10C25B1/04C25B11/06
CPCB01J27/1853C25B1/04C25B11/091B01J35/33B01J35/61Y02E60/36
Inventor 王庆涛崔凯
Owner NORTHWEST NORMAL UNIVERSITY
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