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Co-Mo bimetallic nitride oxygen reduction catalyst as well as preparation method and application thereof

A nitride oxygen, bimetallic technology, applied in nanotechnology, structural parts, electrical components, etc. for materials and surface science, can solve problems such as being unfavorable to industrialization, and achieve considerable methanol resistance, stability, and yield. The effect of high and excellent oxygen reduction catalytic performance

Active Publication Date: 2021-08-06
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the above methods are not conducive to industrialization

Method used

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  • Co-Mo bimetallic nitride oxygen reduction catalyst as well as preparation method and application thereof
  • Co-Mo bimetallic nitride oxygen reduction catalyst as well as preparation method and application thereof
  • Co-Mo bimetallic nitride oxygen reduction catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the first step, weigh 0.6mmol of CoCl 2 ·6H 2 O and 0.6mmol (referring to the concentration of metal Mo ions, the same below) of H 24 Mo 7 N 6 o 24 4H 2 O was dissolved in deionized water, and then 3 mmol of urea was added, and stirred evenly at room temperature.

[0034] In the second step, the mixed solution of the first step is subjected to a hydrothermal reaction at 160±5°C. After the reaction is completed, it is lowered to room temperature, washed with water and ethanol in turn, and dried at 200°C to obtain a double metal oxide CoMoO 4 The precursor solid powder;

[0035] In the third step, the double metal oxide CoMoO 4 The precursor solid powder is placed in a magnetic boat, and the NH at 700 °C 3 Nitriding treatment under the atmosphere for 2±0.5h, and then naturally cool down to room temperature to obtain the black nitride catalytic material Co 3 Mo 3 N.

[0036] To the CoMoO obtained in the present embodiment 1 4 and Co 3 Mo 3 N conducts chara...

Embodiment 2

[0038] In the first step, weigh 0.6mmol of CoCl 2 ·6H 2 O and 0.6 mmol of H 24 Mo 7 N 6 o 24 4H 2 O was dissolved in deionized water, and then 0.6 mmol of urea was added, and stirred evenly at room temperature.

[0039] In the second step, the mixed solution of the first step is subjected to a hydrothermal reaction at 160±5°C. After the reaction is completed, it is lowered to room temperature, washed with water and ethanol in turn, and dried at 200°C to obtain a double metal oxide CoMoO 4 The precursor solid powder;

[0040] In the third step, the double metal oxide CoMoO 4 The precursor solid powder is placed in a magnetic boat, and the NH at 700 °C 3 Nitriding treatment under the atmosphere for 2±0.5h, and then naturally cool down to room temperature to obtain the black nitride catalytic material Co 3 Mo 3 N.

Embodiment 3

[0043] In the first step, weigh 0.6mmol of CoCl 2 ·6H 2 O and 0.6 mmol of H 24 Mo 7 N 6 o 24 4H 2 O was dissolved in deionized water and stirred evenly at room temperature.

[0044] In the second step, the mixed solution is subjected to a hydrothermal reaction at 160±5°C. After the reaction, it is lowered to room temperature, washed with water and ethanol in turn, and dried at 200°C to obtain a double metal oxide CoMoO 4 The precursor solid powder;

[0045] In the third step, the double metal oxide CoMoO 4 The precursor solid powder is placed in a magnetic boat, and the NH at 700 °C 3 Nitriding treatment under the atmosphere for 2±0.5h, and then naturally cool down to room temperature to obtain the black nitride catalytic material Co 3 Mo 3 N.

[0046] To the CoMoO obtained by drying treatment in the present embodiment 3 4 Conduct SEM tests such as Figure 5 As shown, when no urea is added, it is a slender rod-like morphology.

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Abstract

The invention discloses a Co-Mo bimetallic nitride oxygen reduction catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of: controlling the addition amount of ammonia water in a mixed solution of cobalt salt and molybdenum salt, preparing a bimetallic oxide precursor by using a hydrothermal method, and calcining the precursor in ammonia gas at high temperature to obtain the Co-Mo bimetallic nitride. The preparation method disclosed by the invention is simple, high in yield, strong in universality and easy for industrial production, the morphology of the precursor is easy to regulate and control, and the prepared oxide precursor and nitride are relatively pure in phase and free of other impurities. The Co-Mo bimetallic nitride disclosed by the invention is used as a cathode oxygen reduction catalyst, shows relatively good oxygen reduction performance, has excellent methanol tolerance and stability, and is suitable for the fields of fuel cells and the like.

Description

technical field [0001] The invention relates to a Co-Mo bimetallic nitride oxygen reduction catalyst, a preparation method and application thereof, and belongs to the field of fuel cell cathode oxygen reduction catalysts. Background technique [0002] As a renewable energy device, proton exchange membrane fuel cell (PEMFC) can directly convert the chemical energy of fuel and oxidant into electrical energy, and has the characteristics of high efficiency, high reliability, low emission, and quiet operation. Oxygen reduction reaction (ORR), as one of the most critical reactions in fuel cells, is still plagued by many challenges, such as slow reaction kinetics and electrochemical instability. Currently, noble metals, especially Pt-based catalysts, are considered as the most advanced electrocatalysts for ORR. However, the poor toxicity and stability of their small molecules, as well as the high cost of these noble metals hinder their large-scale commercial applications. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y40/00B82Y30/00
CPCH01M4/9091H01M4/9016B82Y30/00B82Y40/00Y02E60/50
Inventor 姜炜田素环郭虎郝嘎子张光普胡玉冰肖磊郭凡刘贵高
Owner NANJING UNIV OF SCI & TECH
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