Carbon-loaded FeO/MnO2 spinel bifunctional catalyst and preparation method and application thereof

A bifunctional catalyst and spinel technology, which is applied to fuel cell type half cells and primary cell type half cells, electrical components, battery electrodes, etc., can solve the problems of unsuitability for industrialization, complex catalyst preparation process, etc. The effect of short reaction time, excellent charge-discharge performance and stability, and excellent electrochemical performance

Inactive Publication Date: 2017-04-05
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the preparation process of the existing catalyst is complex and unsuitable for industrialization

Method used

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  • Carbon-loaded FeO/MnO2 spinel bifunctional catalyst and preparation method and application thereof
  • Carbon-loaded FeO/MnO2 spinel bifunctional catalyst and preparation method and application thereof
  • Carbon-loaded FeO/MnO2 spinel bifunctional catalyst and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A bifunctional catalyst comprising carbon nanotubes and FeO / MnO 2 spinel the FeO / MnO 2 The spinel is FeO nanoparticles with a diameter of 20-150nm, and is evenly loaded on carbon nanotubes and manganese dioxide.

[0036] The preparation method is:

[0037] The first step: configure potassium permanganate solution with a mass ratio of potassium permanganate and water of 1.4g: 100, and add potassium permanganate solution and concentrated hydrochloric acid with a ratio of 101.4g: 4ml to the stirred high In the potassium manganate solution, continue to stir until the mixture is uniform, transfer the resulting mixture to an autoclave at 140°C for a hydrothermal reaction for 12 hours, cool to room temperature, wash with ethanol and deionized water for 5 times, and then dry at 70°C In 24 hours, the manganese dioxide precursor was obtained;

[0038] Step 2: Weigh 0.125g of the above-mentioned manganese dioxide precursor, 0.25g of ferric nitrate and 0.05g of carbon nanotubes,...

Embodiment 2

[0043] A bifunctional catalyst comprising carbon nanotubes and FeO / MnO 2 spinel the FeO / MnO 2 The spinel is FeO nanoparticles with a diameter of 20-150nm, and is evenly loaded on carbon nanotubes and manganese dioxide.

[0044] Preparation of catalytic composites under different calcination times:

[0045] The first step: configure potassium permanganate solution with a mass ratio of potassium permanganate and water of 1.4g: 100, and add potassium permanganate solution and concentrated hydrochloric acid with a ratio of 101.4g: 4ml to the stirred high In the potassium manganate solution, continue to stir until the mixture is uniform, transfer the resulting mixture to an autoclave at 140°C for a hydrothermal reaction for 12 hours, cool to room temperature, wash with ethanol and deionized water for 5 times, and then dry at 70°C In 24 hours, the manganese dioxide precursor was obtained;

[0046] Step 2: Weigh 0.125g of the above-mentioned manganese dioxide precursor, 0.25g of f...

Embodiment 3

[0051] The FeO / MnO of the embodiment 2 of 5mg respectively 2 -CNTs, FeO / MnO 2 -CNTs-3 and FeO / MnO 2 -CNTs-5 catalyst powder was dissolved in 1ml of ethanol and 81% Nafion solution, ultrasonicated for 40 minutes to form a uniform catalyst slurry, and then sprayed on the hydrophobic treated carbon paper to control the catalyst loading to 2mg / cm 2 The air electrode was prepared by drying at 60°C for 40 minutes. At the same time, the zinc foil with the same area as the carbon paper was used as the negative electrode. Batteries, tested using the Gradient Current Mode using the fuel cell activation system:

[0052] At normal temperature and pressure, test the power generation curve and polarization curve such as Figure 4 As shown, it can be seen that FeO / MnO 2 -CNTs-3 has the best performance, its open circuit voltage can reach 1455mV, and the maximum power generation density can reach 350mW / cm 2 . When the voltage is 1V, the current density is 275.1mA / cm 2 , the correspondi...

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Abstract

The invention discloses a carbon-loaded FeO/MnO2 spinel bifunctional catalyst and a preparation method and application thereof. The catalyst comprises carbon nanotubes and FeO/MnO2 spinel. The preparation method comprises dissolving potassium permanganate in water, adding concentrated hydrochloric acid into the solution, carrying out a hydrothermal reaction process for 12h to obtain a manganese dioxide precursor, dissolving the manganese dioxide precursor, ferric nitrate and carbon nanotubes in ammonia water, carrying out ultrasonic dispersion and a hydrothermal reaction process, cooling the product to the room temperature, and then carrying out cleaning, drying and calcination to obtain the bifunctional catalyst. The carbon-loaded FeO/MnO2 spinel bifunctional catalyst has high efficiency oxygen reduction performances and high efficiency oxygen evolution performances in air. A metal-air battery using the carbon-loaded FeO/MnO2 spinel bifunctional catalyst has excellent power generation performances and excellent charging-discharging characteristics and circulation stability.

Description

technical field [0001] The invention belongs to the technical field of dual-function catalysts, in particular to a carbon-supported FeO / MnO 2 Spinel bifunctional catalyst and its preparation method and application. Background technique [0002] In recent years, with the day and night consumption of fossil energy and the increasing environmental pollution, scientific research institutions and business units around the world are competing to develop and research clean and sustainable energy conversion devices, which use electrochemical reactions as the principle of energy storage and conversion. Equipment has attracted great attention, especially in the fields of high-power electrical equipment such as new energy vehicles and fixed energy stations [Chem.S℃.Rev., 2014, 43, 5257-5259]. In particular, rechargeable secondary zinc-air batteries have become a research hotspot in the world today because of their low cost, safety, portability, environmental friendliness and pollution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/06
CPCH01M4/9083H01M12/06
Inventor 乔锦丽徐能能李雪梅李浩然王敏董芳聂琪候晓帆刘予宇张久俊
Owner DONGHUA UNIV
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