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Carbon-based composite fuel cell cathode oxygen reduction catalyst and preparation method thereof

A fuel cell cathode and composite technology, which can be used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, battery electrodes, etc. problems such as transport and ion diffusion properties, to achieve the effect of simple and controllable method, conducive to large-scale production and low energy consumption

Active Publication Date: 2015-04-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong van der Waals interaction, single-layer graphene is easy to agglomerate, which reduces its specific surface area, electron transport and ion diffusion properties.

Method used

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  • Carbon-based composite fuel cell cathode oxygen reduction catalyst and preparation method thereof
  • Carbon-based composite fuel cell cathode oxygen reduction catalyst and preparation method thereof
  • Carbon-based composite fuel cell cathode oxygen reduction catalyst and preparation method thereof

Examples

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Embodiment 1

[0034] A method for preparing a carbon-based composite fuel cell cathode oxygen reduction catalyst, specifically comprising the following steps:

[0035](1) Preparation of graphite oxide: graphite oxide is prepared by using natural graphite powder through the improved Hummers method, which is divided into three steps. Step 1: Disperse 3g of graphite powder (325 mesh) in a solution consisting of 12mL of concentrated sulfuric acid, 2.5g of potassium thiosulfate, and 2.5g of phosphorus pentoxide, and reflux and stir in an oil bath at 80°C for 4.5 hours. Then it was naturally cooled to room temperature, and added dropwise to 0.5L deionized water in an ice-water bath (concentrated sulfuric acid exotherms when it meets water), and stirred overnight. Finally, filter through a PTFE filter with a pore size of 0.2 μm to remove excess acid, and dry at room temperature. Step 2: Disperse the above pre-oxidized graphite powder into 150mL of concentrated sulfuric acid, gradually add 15g of ...

Embodiment 2

[0046] A kind of preparation of nitrogen-doped mesoporous carbon-graphene composite body, comprises the steps:

[0047] Disperse graphite oxide in deionized water, the mass ratio of graphite oxide to deionized water is 2:1, ultrasonically disperse evenly, then add 10mL ~ 20mL phenolic resin prepolymer, ultrasonically stir to obtain a uniform solution, and then transfer it to In a high-pressure reactor, react at 120°C to 160°C for 10 to 30 hours; after it is naturally cooled to room temperature, wash it with deionized water and ethanol, and obtain a powder solid after suction filtration and drying; put the obtained powder solid in an ammonia atmosphere calcination at 600° C. to 900° C. for 1 to 5 hours to fully nitride it, and obtain a mesoporous carbon-graphene composite doped with nitrogen ions.

[0048] Figure 6 The cyclic voltammetry curves of the nitrogen-doped mesoporous carbon-graphene composite and the mesoporous carbon-graphene composite obtained in this example. in...

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Abstract

The invention belongs to the field of energy sources, and particularly relates to a carbon-based composite fuel cell cathode oxygen reduction catalyst and a preparation method thereof. The carbon-based composite fuel cell cathode oxygen reduction catalyst disclosed by the invention is a molybdenum ion-doped mesoporous carbon-graphene complex and is prepared by the following steps: firstly, synthesizing a mesoporous carbon-graphene precursor with a soft template method; carrying out in-situ doping on molybdenum ions, and then burning in an argon atmosphere. The method disclosed by the invention is simple in process and easy to operate; the synthesized material has an ordered mesoporous structure, more active sites, and relatively good electron transport performance; the mesoporous carbon-graphene complex is a novel effective carbon carrier; and inorganic elements can be doped or other non-noble metal catalysts can be loaded, so that the carbon-based composite fuel cell cathode oxygen reduction catalyst can be applied to the field of various energy sources.

Description

technical field [0001] The invention belongs to the field of energy, and in particular relates to a carbon-based composite fuel cell cathode oxygen reduction catalyst and a preparation method thereof. Background technique [0002] As a kinetically slow process, the cathodic oxygen reduction reaction is an important factor limiting the performance of proton exchange membrane fuel cells (PEMFC) and direct methanol fuel cells (DMFC). Generally speaking, the oxygen reduction reaction is divided into the following two pathways: (1) two-step two-electron transport pathway, hydrogen peroxide is an intermediate product; (2) four-electron transport pathway, water is the final product, which is more efficient and more in line with the needs of the people. At present, platinum (Pt)-based catalysts are still the most widely used and active catalyst materials, but the commercialization of fuel cells is seriously hindered due to the high price and scarcity of Pt resources. At the same t...

Claims

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Application Information

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IPC IPC(8): B01J23/28H01M4/90H01M4/88
CPCY02E60/50
Inventor 李景虹董友珍王世伟刘洋
Owner TSINGHUA UNIV
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