A method for in-situ preparation of fuel cell electrodes based on a double-layer ordered microporous layer

A fuel cell electrode, ordered structure technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of increasing the transport resistance of membrane electrodes, affecting the performance and durability of the battery, and the agglomeration or shedding of Pt catalysts. Electrochemical surface area and catalyst stability, the effect of increasing the electrochemical reaction area and improving the electrochemical reaction rate

Active Publication Date: 2021-10-12
JIANGSU UNIV
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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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  • A method for in-situ preparation of fuel cell electrodes based on a double-layer ordered microporous layer
  • A method for in-situ preparation of fuel cell electrodes based on a double-layer ordered microporous layer

Examples

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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 an in-situ preparation method of a fuel cell electrode based on a double-layer ordered microporous layer, and relates to the field of fuel cells. The method includes treating the electrode base layer, preparing a hydrophobic layer, preparing an ordered hydrophilic layer, and preparing In situ growth of platinum-based catalysts on the hydrophilic layer. In the fuel cell electrode prepared by the present invention, the Pt-based catalyst is directly grown in situ on the ordered microporous layer, so that the Pt-based catalyst exhibits different forms such as nanowires and nanodendrites, which increases the electrochemically active surface area and catalyst stability. It reduces the transmission resistance between the microporous layer and the catalytic layer, and can effectively improve the performance of the battery. Under low-temperature fuel cell operating conditions, the electrode exhibits better battery performance than conventional electrodes.

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 Patents(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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