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High-performance oxygen reduction catalyst MnOx/Mn2N-N-C composite catalyst and preparation method and application thereof

A composite catalyst and high-performance technology, applied in the field of electrocatalysis, can solve the problems of low activity and conductivity, and achieve the effects of simple preparation method, good comprehensive performance and good application prospects

Active Publication Date: 2016-07-27
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the single MnO in the prior art x and Mn 2 N has the defects of low activity and conductivity as an ORR catalyst. One of the purposes of the present invention is to provide a new type of oxygen reduction MnO that can be used as an ORR catalyst and whose overall catalytic performance is better than that of 20wt% Pt / C commercial catalysts. x / Mn 2 N-N-C composite catalyst

Method used

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  • High-performance oxygen reduction catalyst MnOx/Mn2N-N-C composite catalyst and preparation method and application thereof
  • High-performance oxygen reduction catalyst MnOx/Mn2N-N-C composite catalyst and preparation method and application thereof
  • High-performance oxygen reduction catalyst MnOx/Mn2N-N-C composite catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] MnO x / Mn 2 Preparation of N-N-C:

[0030] The synthetic method of one-step heat treatment is adopted, and the specific process is as follows: Weigh 0.3g of glucose, 10g of urea and 0.08g of manganese acetate tetrahydrate, add 5mL of deionized water, and after ultrasonic dissolution and evaporation of water, the obtained precursor mixture is Heating from room temperature to 900°C in nitrogen protective gas at a heating rate of 4°C / min, keeping at 900°C for 1 hour, cooling naturally to 70°C, taking out, and then cooling to room temperature in air to obtain a black powder. MnO x Nanoparticles (MnO and Mn 3 o 4 ) and Mn 2 The mass percentage content of N nanoparticles is about 31%, the mass percentage content of nitrogen-doped graphene is about 69%, and the mass percentage content of nitrogen in nitrogen-doped graphene is about 1.5%.

[0031] X-ray diffractometer (XRD, Rigaku-D / Max2550, Cu-Kα, 40kV, 300mA) for phase analysis of the product; the morphology of the pr...

Embodiment 2

[0035] According to the method of embodiment 1, add 0.1g manganese acetate tetrahydrate in the precursor, prepare MnO x / Mn 2 N-N-C-2 complex.

[0036] The evaluation method of catalytic performance is the same as in Example 1.

[0037] MnO x / Mn 2 The onset potential of N-N-C-2 composite as an ORR catalyst is -0.09V (vs.Hg / HgO), the half-wave potential is -0.24V (vs.Hg / HgO), and the limiting current density is -5.1mA / cm 2 . In the current meter evaluation, after 7200s of continuous operation, the current density retention rate is about 93%.

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Abstract

The invention discloses a high-performance oxygen reduction catalyst MnOx / Mn2N-N-C composite catalyst and a preparation method and an application thereof. The composite catalyst is formed by loading MnOx (MnO and Mn3O4) nanoparticles and Mn2N nanoparticles on three-dimensional porous N-doped graphene; and the preparation method comprises the following steps: evaporating and drying a water solution containing urea, glucose and manganese acetate tetrahydrate; and carrying out high-temperature thermal treatment on the obtained mixture in a protective atmosphere and cooling the mixture to obtain the MnOx / Mn2N-N-C composite catalyst. The preparation method is simple, low in cost and beneficial to industrial production; and the prepared MnOx / Mn2N-N-C composite catalyst has the characteristics of high activity and good stability when applied to a fuel cell and has better overall performance and better application prospect than commercial 20wt% of Pt / C.

Description

technical field [0001] The present invention relates to a kind of oxygen reduction (ORR) catalyst and its preparation and application method, particularly a kind of oxygen reduction MnO used for fuel cell x / Mn 2 The invention discloses an N-N-C composite catalyst and a preparation method thereof, belonging to the technical field of electrocatalysis. technical background [0002] Energy has always been an important material basis for human survival and development. However, due to the unrestrained use of traditional fossil energy by human beings, the crisis of energy depletion and environmental pollution are becoming increasingly serious. Therefore, developing an energy system with green, safe, efficient, and low-cost characteristics is an effective way to solve energy crisis and environmental problems. As a kind of energy equipment with high conversion efficiency, stable performance and environment-friendly, fuel cell is considered as "green energy in the 21st century", ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/88H01M4/90H01M4/9083Y02E60/50
Inventor 钱东刘昆王喜鹏李军闵紫嫣
Owner CENT SOUTH UNIV
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