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Preparation method of membrane electrode of direct methanol fuel cell

A methanol fuel cell and membrane electrode technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of disorder of the catalytic layer, restricting the performance and function of the battery, and low structural controllability, and achieve mass transfer efficiency and catalyst. Utilize the effect of improving efficiency

Inactive Publication Date: 2013-12-11
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the membrane electrode prepared by this method still has problems such as thick catalytic layer, low structural controllability, and disordered catalytic layer.
Therefore, the traditional GDE and improved CCM methods have little room for further improvement in the controllable construction of the membrane electrode micro-nano structure, which restricts the continuous improvement of the performance and function of the entire battery. It is urgent to develop a new generation of membranes based on nanotechnology. Electrode preparation method

Method used

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  • Preparation method of membrane electrode of direct methanol fuel cell
  • Preparation method of membrane electrode of direct methanol fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The Nafion / carbon powder mixed nanofiber network structure film was constructed by electrospinning technology, and then the commercial Pt catalyst was directly deposited on the surface to make the cathode membrane electrode of the direct methanol fuel cell.

[0070] 1. Weigh 133mg of Vulcan XC-72R activated carbon spheres and disperse them into 2g of DuPont's 5wt% Nafion resin solution (the solvent is a mixture of water and low-carbon alcohol, and the mass ratio of water to low-carbon alcohol is 58:42) In the process, after stirring for one hour, a homogeneous activated carbon slurry was obtained by ultrasonication at room temperature for 3 hours; the low-carbon alcohol could be isopropanol, butanol, ethanol or methanol.

[0071] 2. Weigh 0.8g of PVA (110kD) powder and disperse it into 9.2mL of deionized water, stir at 80°C for 24 hours to obtain a uniform 8wt% PVA solution.

[0072] 3. Weigh 834mg of 8wt% PVA solution and add it to the uniformly stirred activated carbo...

Embodiment 2

[0078] The Nafion / carbon powder mixed nanofiber network structure film was constructed by electrospinning technology, and then the surface was impregnated with Na 2 PtCl 6 Precursor + hydrogen reduction method to reduce catalyst to prepare cathode membrane electrode for direct methanol fuel cell.

[0079] 1. Prepare XC-72R / Nafion / PVA (4:3:2 by weight) nanofiber membrane according to steps 1-4 of Example 1.

[0080] 2. Weigh 28.6mg Na 2 PtCl 6 (Pt content 35wt%, Pt=10mg) powder, join 2mL isopropanol and water (volume ratio IPA:H 2 O=1:1) in the mixture, dissolved. Measure 200 μL of the above precursor solution with a micro-syringe and evenly drop it to 1×1 cm 2 The surface of the nanofibrous membrane was dried at room temperature.

[0081] 3. Transfer the nanofibrous membrane containing the precursor to a tube furnace, and pass N 2 / H 2 Mixed gas (hydrogen volume content 5%), according to 1 ℃.min -1 The heating rate was slowly raised to 120°C, kept for 2 hours, then sl...

Embodiment 3

[0086] The Nafion / carbon powder mixed nanofiber network structure film was constructed by electrospinning technology, and then the anode membrane electrode of direct methanol fuel cell was prepared by surface deposition of commercial PtRu catalyst.

[0087] 1. Prepare XC-72R / Nafion / PVA (4:3:2 by weight) nanofiber membrane according to steps 1-4 of Example 1.

[0088] 2. Weigh 10 mg of PtRu black and disperse it into 2.5 mL of deionized water, add 0.5 mL of 5wt% Nafion resin solution, sonicate at room temperature for 1 hour, add 3 mL of isopropanol, and continue to sonicate at room temperature for 1 hour to obtain a uniform catalyst slurry. Measure 300 μL of the above catalyst slurry through a micro-syringe and evenly drop it to 1×1 cm 2 On the surface of the gas diffusion layer, a PtRu+Nafion-MPL catalytic layer is formed (PtRu loading is 0.5mg.cm -2 ); also take 300 μL of the above catalyst slurry through a micro-syringe 2 On the surface of the nanofiber membrane, a PtRu+Na...

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Abstract

The invention relates to a preparation method of the membrane electrode of a direct methanol fuel cell. The method comprises the following steps: an electrostatic spinning technology is adopted to construct a nano-fiber network structure thin membrane mixed by active carbon powder and Nafion resin; a precious metal nano-catalyst is deposited on the surface of the manufactured nano-fiber network structure thin membrane, so that a cathode catalyst layer thin membrane and an anode catalyst layer thin membrane are manufactured respectively; or the mixture of the precious metal nano-catalyst and the Nafion resin is taken as raw materials to directly construct the cathode catalyst layer thin membrane and the anode catalyst layer thin membrane through the electrostatic spinning technology; a cathode gas diffusion layer, the anode catalyst layer thin membrane, a Nafion membrane, the cathode catalyst layer thin membrane and a cathode gas diffusion layer are hot-pressed finally, so that the aggregation of the membrane electrode of the direct methanol fuel cell is manufactured; the membrane electrode with a nano-fiber three-dimensional network structure is constructed through the electrostatic spinning technology, so that the maximization of the three-phase reaction interface of the membrane electrode is achieved, and the improvement of electrocatalytic activity, mass-transfer efficiency and utilization efficiency of the catalyst is achieved.

Description

technical field [0001] The invention relates to a method for preparing a membrane electrode of a direct methanol fuel cell, in particular to a method for constructing a nanofiber network structure as a membrane electrode of a direct methanol fuel cell based on nano electrospinning technology. Background technique [0002] Direct methanol fuel cell is a green new energy, which has the advantages of high energy conversion efficiency, high energy density, environmental friendliness, low operating noise, and convenient operation. It has attracted extensive research interest in the energy field, especially in electric vehicles, mobile phones, etc. , notebooks, portable communications and medical equipment and other power supplies and mobile power supply fields have extremely broad application prospects. [0003] As the core component of the fuel cell, the membrane electrode assembly (MEA) is the site of material transport, electrochemical reaction, electron and proton transfer, a...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 邹志青陈鹏武慧娟张海峰郑军伟杨辉
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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