Fuel cell electrode in-situ preparation method based on microporous layer with double-layer ordered structure

A fuel cell electrode and ordered structure technology, applied to battery electrodes, structural parts, circuits, etc., can solve the problems of increasing the material transmission resistance of the membrane electrode, affecting the performance and durability of the battery, and agglomerating or falling off the Pt catalyst. Effects of electrochemical surface area and catalyst stability, increasing electrochemical reaction area, and increasing electrochemical reaction rate

Active Publication Date: 2021-02-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although a pore-forming agent was added in the preparation of the microporous layer, the arrangement of the obtained micropores was not uniform, and the transmission channels of the microporous layer prepared by the spraying method were also in a disordered state.
Most of the Pt catalyst in the catalytic layer is deposited on the surface of the carrier as spherical particles, and many active sites are hidden under the surface, which cannot play a catalytic role. Moreover, during the long-term operation of the battery, the Pt catalyst may agglomerate or fall off, seriously Affects battery performance and durability
In addition, there are two contact interfaces between the support layer (carbon paper or carbon cloth)-microporous layer-catalytic layer, which increases the material transport resistance of the membrane electrode.

Method used

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  • Fuel cell electrode in-situ preparation method based on microporous layer with double-layer ordered structure
  • Fuel cell electrode in-situ preparation method based on microporous layer with double-layer ordered structure

Examples

Experimental program
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Effect test

Embodiment 1

[0040] combined with figure 2 The shown process and process prepare a fuel cell electrode in which platinum-based nanowires are in-situ grown on an ordered microporous layer, and conduct a discharge test. The main steps are as follows:

[0041] (1) Preparation of microporous layer with ordered structure: ① carbon powder (Vulcan XC-72R), PTFE and NH 4 Disperse Cl in the isopropanol dispersion liquid, apply ultrasonically, and evenly spray on the surface of the hydrophobically treated carbon paper, dry it at 70°C for 2h, then put it into a muffle furnace at 370°C for sintering for 30min, take it out and weigh it for calculation, The obtained carbon powder load is 1~1.5mgcm -2 , PTFE: C=15% hydrophobic microporous layer. ②The acid-treated toner (Vulcan XC-72R), Nafion and NH 4 Disperse Cl in the isopropanol dispersion liquid, ultrasonically, and evenly spray on the hydrophobic microporous layer. Before drying, use the AAO template (pore size 0.5 μm, pore spacing 1 μm) to car...

Embodiment 2

[0046] The template parameters for making the microporous layer with ordered structure are 1 μm in pore size and 2 μm in pore spacing. Other relevant parameters in the membrane electrode are the same as in Example 1, and the battery test conditions are the same as in Example 1. Under 0.6V working voltage, the current density can reach 1.0Acm -2 , the maximum power density reaches 0.716Wcm -2 .

Embodiment 3

[0048] according to figure 2 The shown process and process prepare fuel cell electrodes in which platinum nanorods are in-situ grown on an ordered microporous layer, and a discharge test is performed. The reducing agent used for the in-situ growth of the platinum catalyst is ascorbic acid, and the obtained catalyst exhibits the morphology of nanorods. Other relevant parameters in the membrane electrode are the same as in Example 1, and the battery test conditions are the same as in Example 1. Under 0.6V working voltage, the current density can reach 1.0Acm -2 , the maximum power density reaches 0.713Wcm -2 .

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Abstract

The invention discloses a fuel cell electrode in-situ preparation method based on a microporous layer with a double-layer ordered structure, and relates to the field of fuel cells, and the method comprises the following steps: treatment of an electrode substrate layer, preparation of a hydrophobic layer, preparation of an ordered hydrophilic layer and in-situ growth of a platinum-based catalyst onthe hydrophilic layer. In the fuel cell electrode prepared by the method, the Pt-based catalyst directly grows on the ordered microporous layer in situ, so that the Pt-based catalyst shows differentforms such as nanowires and nano dendrites, the electrochemical active surface area and the catalyst stability are increased, the transmission resistance between the microporous layer and the catalystlayer is reduced, and the performance of the cell can be effectively improved. Under a low-temperature fuel cell operation condition, the electrode shows more excellent cell performance than a traditional electrode.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to an electrode in which a catalyst grows in-situ on a microporous layer with an ordered structure and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency hydrogen energy conversion device, which can directly convert the chemical energy stored in hydrogen fuel and oxidant into electrical energy through electrochemical reaction. It is environmentally friendly, high specific energy, and low temperature. The characteristics of quick start and high smooth operation can be applied to many fields such as new energy vehicles, field mobile power supply and silent power supply. It is considered to be an ideal power source to replace the internal combustion engine, and has received extensive attention and research in recent years. [0003] However, the current research and development of PEMFC still faces problems su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86
CPCH01M4/8605H01M4/88H01M4/8807H01M4/8825Y02E60/50
Inventor 苏华能李金龙张玮琦马强徐谦
Owner JIANGSU UNIV
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