Membrane electrode structure for proton exchange membrane fuel cell and its preparing method

A proton exchange membrane and electrode structure technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as unfavorable anode discharge, cathode diffusion and water discharge, and achieve improved electrode performance and precious metal catalyst utilization. , the effect of reducing the loss of mass transfer polarization

Active Publication Date: 2005-05-04
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] 2. Single-layer catalytic layer, there is no gradient distribution type hydrophobic structure and pore structure f

Method used

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  • Membrane electrode structure for proton exchange membrane fuel cell and its preparing method
  • Membrane electrode structure for proton exchange membrane fuel cell and its preparing method
  • Membrane electrode structure for proton exchange membrane fuel cell and its preparing method

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preparation example Construction

[0049] The preparation method of the membrane electrode that is used for proton exchange membrane fuel cell of the present invention comprises the following steps:

[0050] The first step, catalyst slurry preparation: weigh a certain amount of catalyst and Nafion solution, then add a certain amount of mixed solvent of alcohols and water, and mix well. The alcohol solvents include C1-C5 monohydric alcohols such as ethanol and isopropanol, and C2-C5 polyhydric alcohols such as ethylene glycol and glycerin. The mass ratio relationship between alcohol and water in the mixed solvent is water:alcohol=1:1-10.

[0051] The second step, preparation of multi-layer catalytic layer: (A) direct dispersion method: (1) use a spray gun, ultrasonic nozzle or other spraying equipment to uniformly (2) After the solvent has volatilized, continue to contain another low-loaded or high-loaded, non-loaded anode catalyst The slurry (ink) is evenly sprayed on the first anode catalyst layer to form tw...

Embodiment 1

[0054] Operating conditions: battery temperature is 90°C; 1mol / L methanol aqueous solution is injected at 2ml / min; 0.2MPa oxygen or air, the flow rate is 4.3ml / s.

[0055] Accurately weigh 60mg 30wt.%Pt-15wt.%Ru / XC-72R Carbon (S BET =250m 2 / g) catalyzer, then add the mixed solvent of dehydrated alcohol and water (water: dehydrated alcohol=1: 10 volume ratio), mix homogeneously, then add 64mg 5%Nafion solution, continue to stir and mix homogeneously, obtain catalyst slurry, use The spray gun sprays this slurry evenly on the surface with a size of 8.6*8cm 2 On the polytetrafluoroethylene (PTFE) film, dry at room temperature, part of the catalyst slurry is lost during the spraying process, and the catalyst loading on the polytetrafluoroethylene (PTFE) film is 0.765mg / cm 2 , Nafion content is 5wt.%. Take by weighing 60mg 60wt.%Pt-30wt.%Ru black catalyst, catalyst slurry is evenly sprayed on the above-mentioned polytetrafluoroethylene (PTFE) that has been sprayed with 30wt.%Pt-...

Embodiment 2

[0059] Operating condition is the same as embodiment 1.

[0060]Prepare the slurry according to the steps in Example 1, then spray the catalyst slurry on both sides of the Nafion membrane, and the electrode loadings are: anode; 0.877mg / cm 2 20wt.%Pt-10wt.%Ru / KetjenBlack carbon (S BET =1000m 2 / g), Nafion content 10wt.%, 0.976mg / cm 2 50wt.%Pt-25wt.%Ru / acetylene black carbon (S BET =50m 2 / g), Nafion content is 40wt.%; Negative electrode: 1.47mg / cm 2 40wt.% Pt-Fe / Ketjen Black carbon, Nafion content is 10wt.% 1.52mg / cm 2 80wt.% Pt / XC-72R carbon, Nafion content is 40wt.%. The performance of the membrane electrode (deleted) at 90°C is as follows image 3 shown.

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Abstract

In structure of electrode, catalysis layer is in structure of multiple layers. The said catalysis layer composed of composite two layers including hydrophilic catalysis layer and hydrophobic catalysis layer covering on surface of membrane. Catalysis layer composed of composite two layers is fabricated through steps: catalyst and Nation are dispersed on membrane directly or dispersed on membrane through transferring press of polytetrafluoroethylene (PTFE) film indirectly. Advantages are: in favor of discharging CO2 from anode and O2 from cathode, reducing loss caused by polarization of mass transfer, increasing ultimate current density so as to raise performance of electrode and use ratio of catalyst prepared from noble metal.

Description

technical field [0001] The invention relates to fuel cell technology, in particular to a membrane electrode structure for a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] In recent years, multifunctional portable electronic products have developed rapidly, and power consumption has increased sharply. The power density of various primary or secondary batteries currently commercialized is low, and it is necessary to increase the volume and weight of batteries to meet the needs of electronic products. electricity demand. Moreover, the primary or secondary battery has the problem of environmental pollution. Direct methanol fuel cell is a type of proton exchange membrane fuel cell that directly uses methanol as fuel. Due to the rich sources of methanol fuel, the price is cheap, and the theoretical specific energy density is high (3000Wh / kg, the specific energy density of lithium-ion batteries is about 600Wh / kg), it is easy to ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M4/92
CPCY02E60/50
Inventor 孙公权汪国雄樊小颖王素力赵新生孙海辛勤
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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