Cobalt-nickel bimetal phosphate flower-like microsphere electrocatalyst and preparation method thereof

A phosphate flower and bimetallic technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve problems such as large overpotential, limited oxygen evolution electrocatalysis, slow kinetics, etc., and achieve structural stability , increase the transfer channel, the effect of simple synthesis method

Inactive Publication Date: 2019-06-18
淮安新能源材料技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of electrocatalytic hydrolysis, the oxygen evolution reaction has a great defect, that is, it has slow kinetics and a large overpotential. These two points seriously limit the further development of oxygen evolution electrocatalysis, so from improving the electrocatalytic efficiency On the one hand, the key issue is to find efficient catalysts for electrocatalysis

Method used

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  • Cobalt-nickel bimetal phosphate flower-like microsphere electrocatalyst and preparation method thereof
  • Cobalt-nickel bimetal phosphate flower-like microsphere electrocatalyst and preparation method thereof
  • Cobalt-nickel bimetal phosphate flower-like microsphere electrocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] 1. Synthesis of cobalt-nickel bimetallic organic phosphonic acid compound microsphere precursor: weigh 2.0 mmol of phenylphosphonic acid with an electronic balance, add it to 50 ml of deionized water, and prepare phenylphosphonic acid with a concentration of 0.04 mol / L Aqueous solution, called solution A; cobalt nitrate hexahydrate (Co(NO 3 ) 2 •6H 2 O) and nickel nitrate hexahydrate (Ni(NO 3 ) 2 •6H 2 O) Weigh 2.0 mmol according to the molar ratio of 8:2, and add it into 50 ml deionized water to form a solution with a concentration of 0.04 mol / L, which is called solution B. Mix the two solutions A and B, stir evenly on a magnetic stirrer, then add 0.20 mol of urea, stir evenly after 30 min, transfer the mixture to a Teflon reactor, heat in an oven, and keep at 80 °C Under reaction for 5 h. Take it out from the oven, cool it to room temperature, filter it with filter membrane (0.22 μm), wash it with deionized water several times, and finally dry the obtained purpl...

Embodiment 2

[0025] 1. Synthesis of cobalt-nickel bimetallic organic phosphonic acid compound microsphere precursor: Weigh 2.8 mmol of phenylphosphonic acid with an electronic balance, add it to 70 ml of deionized water, and prepare phenylphosphonic acid with a concentration of 0.04 mol / L Aqueous solution, called solution A; cobalt nitrate hexahydrate (Co(NO 3 ) 2 •6H 2 O) and nickel nitrate hexahydrate (Ni(NO 3 ) 2 •6H 2 O) Weigh 2.8 mmol according to the molar ratio of 7:3, and add it to 70 ml deionized water to form a solution with a concentration of 0.04 mol / L, which is called solution B. Mix the two solutions of A and B, stir evenly on a magnetic stirrer, then add 0.28 mol of urea, stir evenly after 45 min, transfer the mixture to a Teflon reactor, heat in an oven, and keep at 60 °C Under reaction 8 h. Take it out from the oven, cool it to room temperature, filter it with a filter membrane (0.22 μm), wash it with deionized water several times, and finally dry the obtained purple...

Embodiment 3

[0028] 1. Synthesis of cobalt-nickel bimetallic organophosphonic acid compound microsphere precursor: Weigh 3.6 mmol of phenylphosphonic acid with an electronic balance, add it to 90 ml of deionized water, and prepare phenylphosphonic acid with a concentration of 0.04 mol / L Aqueous solution, called solution A; cobalt nitrate hexahydrate (Co(NO 3 )2 •6H 2 O) and nickel nitrate hexahydrate (Ni(NO 3 ) 2 •6H 2 O) Weigh 3.6 mmol according to the molar ratio of 6:4, and add it to 90 ml deionized water to form a solution with a concentration of 0.04 mol / L, which is called solution B. Mix the two solutions of A and B, stir evenly on a magnetic stirrer, then add 0.36 mol of urea, stir evenly after 60 min, transfer the mixture to a Teflon reactor, heat in an oven, and keep at 70 °C Under the reaction 6 h. Take it out from the oven, cool it to room temperature, filter it with filter membrane (0.22 μm), wash it with deionized water several times, and finally dry the obtained purple p...

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Abstract

The invention discloses a cobalt-nickel bimetal phosphate flower-like microsphere electrocatalyst and a preparation method thereof. The preparation method comprises the steps of adjusting PH with urea, and slowly synthesizing cobalt-nickel bimetal organic phosphoric compound flower-like microsphere precursor CoNiPP; carrying out high temperature treatment at different temperatures to obtain the cobalt-nickel bimetal phosphate flower-like microsphere electrocatalyst which still well retains the flower-like microsphere structure of the precursor and which has a structural general formula of CoNiPP-T, with T=700-900 DEG C. The flower-like microsphere structure helps effectively increase specific surface area and porosity of a material, thereby adding more transfer channels of internal electrons during electrocatalytic reaction; organic benzene rings in phenylphosphonic acid are removed and decomposed by calcining to obtain a porous carbon coating layer, so that the quantity of active sites for electrocatalytic reaction can be increased. In addition, double metals are present, each metal corresponds to a different active site, and therefore, the quantity of active sites for electrocatalytic reaction can also be increased.

Description

technical field [0001] The invention relates to the technical field of electrocatalytic material manufacture, in particular to a cobalt-nickel bimetallic phosphate flower-shaped microsphere electrocatalyst. Background technique [0002] With the increasing demand for energy and the increasing awareness of environmental protection, these have prompted widespread attention to the research of energy storage technologies with high efficiency and environmental friendliness. Among them, electrocatalytic hydrolysis has attracted the attention of many researchers. Electrocatalysis includes oxygen reduction, oxygen evolution reaction and hydrogen evolution reaction. In the process of electrocatalytic hydrolysis, the oxygen evolution reaction has a great defect, that is, it has slow kinetics and a large overpotential. These two points seriously limit the further development of oxygen evolution electrocatalysis, so from improving the electrocatalytic efficiency On the one hand, the ke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J35/08B01J35/10C25B11/06C25B1/04
CPCY02E60/36
Inventor 封平净刘耀春卢鹏
Owner 淮安新能源材料技术研究院
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