Nitrogen/transition metal-codoped hierarchical-pore carbon oxygen reduction catalyst, and preparation method and application thereof

A technology of transition metals and transition metal salts, which is applied in the direction of fuel cell half-cells and primary battery half-cells, electrical components, battery electrodes, etc., to achieve the effects of overcoming corrosion problems, high yields, and increased yields

Active Publication Date: 2016-02-03
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a nitrogen/transition metal co-doped hierarchical porous carbon-oxygen reduction catalyst and its preparation method and application.

Method used

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  • Nitrogen/transition metal-codoped hierarchical-pore carbon oxygen reduction catalyst, and preparation method and application thereof
  • Nitrogen/transition metal-codoped hierarchical-pore carbon oxygen reduction catalyst, and preparation method and application thereof
  • Nitrogen/transition metal-codoped hierarchical-pore carbon oxygen reduction catalyst, and preparation method and application thereof

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Example Embodiment

[0044] Example 1

[0045] A nitrogen / M (M=Fe / Co / Ni) co-doped hierarchical carbon catalyst, obtained by processing a precursor, the precursor including silica powder with a mass content of 20%, a mass content It is 25% nitrogen-containing polymer [polyquaternized (bis(2-chloroethyl)ether-alt-1,3-bis[3-(dimethylamino)propyl]urea (abbreviation: PQ-2) , Sigmaaldrich Company) and metal salt with a mass content of 55% (FeSO 4 , CoSO 4 , NiSO 4 ). The above-mentioned mass content is based on the total mass of the precursor. The treatment includes the first roasting reduction treatment, alkali washing treatment, acid washing treatment and the second roasting reduction treatment.

[0046] The preparation method of the nitrogen / M co-doped hierarchical carbon oxygen reduction catalyst is:

[0047] (1) PQ-2, silica powder with a particle size of 500nm and transition metal salt are respectively configured into 5% PQ-2 solution and 10% SiO with 1 mole per liter of hydrochloric acid. 2 Solution ...

Example Embodiment

[0053] Example 2

[0054] Mix isopropanol and Nafion solution with a mass concentration of 0.5% in a volume ratio of 4:1 to obtain a mixed solution of isopropanol and Nafion. 2mg of the nitrogen / M obtained in Example 1 was co-doped with the hierarchical carbon catalyst and 20% The Pt / C catalyst is dispersed in the above 0.6ml isopropanol and Nafion mixed solution, and a homogeneous catalyst solution is obtained under ultrasound. Then drop it onto the glass disk electrode to make the loading of the catalysts N-Fe-HPC, N-Ni-HPC and N-Co-HPC respectively 500μg / cm 2 , The loading of 20% Pt / C catalyst is 100μg / cm 2 , Let dry naturally. Oxygen was introduced into the electrolyte solution for 30 minutes, and then the glassy carbon disk electrode coated with the catalyst was used as the working electrode. The saturated calomel electrode and the Pt electrode were the reference electrode and the counter electrode, respectively. The N-Fe- was measured in the three-electrode system in turn. ...

Example Embodiment

[0056] Example 3

[0057] Mix isopropanol and Nafion solution with a mass concentration of 0.5% in a volume ratio of 3:1 to obtain a mixed solution of isopropanol and Nafion. Disperse 10mg of the N-Fe-HPC catalyst obtained in Example 1 into the above 12ml isopropanol and Nafion In the mixed solution, a homogeneous catalyst solution is obtained under the action of ultrasound. Then spray on the hydrophobic treated carbon paper (loading is 1.0, 2.0, 3.0mg / cm 2 ), dried at 60°C for 30 minutes to prepare an air electrode. At the same time, the zinc foil with the same area as the carbon paper is used as the negative electrode, and the air electrode and zinc foil are put into the 6mol / L potassium hydroxide solution to form the actual two Electrode zinc-air battery, using the fuel cell activation system to use the gradient current mode test: normal temperature and pressure, test the power generation curve and polarization curve.

[0058] Such as image 3 As shown, as the load increases, t...

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Abstract

The invention relates to a nitrogen/transition metal-codoped hierarchical-pore carbon oxygen reduction catalyst, and a preparation method and application thereof. The catalyst comprises the following raw materials by mass: 10 to 60% of a template, 5 to 60% of a nitrogen-containing polymer and 15 to 40% of a transition metal salt. The method comprises the following steps: separately dissolving the nitrogen-containing polymer, the template and the transition metal salt in solvents to obtain a nitrogen-containing polymer solution, a template solution and a transition metal salt solution respectively; subjecting the three solutions to mixing under stirring and to drying so as to obtain a precursor; roasting the precursor so as to obtain a catalyst intermediate; and subjecting the catalyst intermediate to alkali washing, acid pickling and roasting again so as to obtain the catalyst. The preparation method is simple to operate, has low cost and high yield and greatly reduces dependence on the precious metal Pt; and the prepared catalyst overcomes the problem of corrosion caused by usage of a non-noble metal catalyst and has wide application prospects in the aspects of a metal-air battery and a flow battery.

Description

technical field [0001] The invention belongs to the field of oxygen reduction catalysts, in particular to a nitrogen / transition metal co-doped hierarchical porous carbon-oxygen reduction catalyst and its preparation method and application. Background technique [0002] Under the background of the global oil, coal and other fossil energy reserves are decreasing and the environmental pollution is becoming more and more serious, high-efficiency energy storage devices using electrochemical reactions have attracted great attention [NanoLett.2012, 12, 1946-1952]. Metal-air batteries were used as portable power sources in railways and postal and telecommunications systems as early as World War I. It is a "semi-fuel" battery between a primary battery and a fuel cell, and has the characteristics of both a fuel cell and a battery. Since the positive electrode of the zinc-air battery comes from the oxygen in the air and uses it as the positive electrode active material, it is truly a ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88H01M12/06
CPCH01M4/88H01M4/90H01M12/06
Inventor 乔锦丽武明杰徐能能周学俊
Owner DONGHUA UNIV
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