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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. The method is characterized by easy operation, low cost and high yield, which greatly reduces the need for Reliance on noble metal Pt overcomes the corrosion problem caused by the use of non-noble metal catalysts

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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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Embodiment 1

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

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

[0047] (1) PQ-2, particle diameter is that 500nm silicon dioxide powder and transition metal salt are configured into respectively the PQ-2 solution of 5%, the SiO of 10% with the hydrochloric acid of 1 mole per lit...

Embodiment 2

[0054] The Nafion solution that isopropanol and mass concentration is 0.5% is mixed according to the volume ratio 4:1, obtains the mixed solution of isopropanol and Nafion, the nitrogen / M co-doped hierarchical porous carbon catalyst obtained in the embodiment 1 of 2mg and 20% The Pt / C catalyst was dispersed into the mixed solution of 0.6 ml of isopropanol and Nafion, and a homogeneous catalyst solution was obtained under the action of ultrasound. Then it was drop-coated on the glass disk electrode, so that the loading of catalysts N-Fe-HPC, N-Ni-HPC, and N-Co-HPC was 500 μg / cm 2 , the loading of 20% Pt / C catalyst is 100 μg / cm 2 , to 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, and the saturated calomel electrode and the Pt electrode were respectively used as the reference electrode and the counter electrode, and N-Fe- Polarization curves...

Embodiment 3

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

[0058] Such as image 3 As sho...

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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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