Preparation method and application of self-supporting membrane electrode

A self-supporting film and electrode technology, which is applied in the direction of circuits, fuel cells, electrical components, etc., can solve the problems of reduced catalyst active area, weak combination between platinum catalyst and base layer, and affecting battery performance, so as to avoid dissolution and Austrian Effects of Swald ripening, enhanced redox reaction performance, and improved catalyst performance

Active Publication Date: 2022-02-22
JIANGSU UNIV
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Problems solved by technology

However, due to the low solubility and low diffusion rate of gases (such as O2) in phosphoric acid and the adsorption of phosphoric acid on the surface of Pt catalyst, the efficiency of oxygen reduction reaction (ORR) in the electrode is low and the cost increases.
Moreover, under the conditions of high temperature and strong acid, it is easy to cause the aging of the Pt catalyst, resulting in a reduction in battery life.
In addition, the spraying process used by traditional commercial platinum-carbon catalysts (Pt / C) is complex, and the binder used will reduce the active area of ​​the catalyst, affecting battery performance, and the loss in the process is large, and the bonding force between the platinum catalyst and the base layer is not strong

Method used

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  • Preparation method and application of self-supporting membrane electrode

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Effect test

Embodiment 1

[0030] Electrodeposition of platinum catalyst fuel cell electrode with nano flower shape and special morphology, and discharge test. The main steps are as follows:

[0031] (1) Treatment of the electrode base layer: use carbon paper as the electrode base layer, and cut it into an appropriate size of 1×2.5cm 2 , and then washed in heated acetone for 15 minutes to remove dirt and functional groups on the surface of the carbon paper, and then ultrasonically washed in deionized water for 15 minutes to wash off the acetone on the surface;

[0032] (2) Preparation of hydrophilic electrode base layer: put the carbon paper processed in (1) into H 2 SO 4 and HNO 3 In the mixed acid, the proportion of the mixed acid is 98wt%H 2 SO 4 : 68wt% HNO 3 =2:1, ultrasonic for 30min, ultrasonic for 15min in deionized water, washed with deionized water for 3 times, placed in 0.5M H 2 SO 4 in standby;

[0033] (3) Prepare the solution used for deposition: take 1g H 2 PtCl6 The powder was ...

Embodiment 2

[0039] Electrodeposition of thorny special morphology platinum catalyst fuel cell electrode, and discharge test. The main steps are as follows:

[0040] (1) Treatment of the electrode base layer: use carbon paper as the electrode base layer, and cut it into an appropriate size of 1×2.5cm 2 , and then washed in heated acetone for 15 minutes to remove dirt and functional groups on the surface of the carbon paper, and then ultrasonically washed in deionized water for 15 minutes to wash off the acetone on the surface;

[0041] (2) Preparation of hydrophilic electrode base layer: put the carbon paper processed in (1) into H 2 SO 4 and HNO 3 In the mixed acid, the proportion of the mixed acid is 98wt%H 2 SO 4 : 68wt% HNO 3 =2:1, ultrasonic for 30min, ultrasonic for 15min in deionized water, washed with deionized water for 3 times, placed in 0.5M H 2 SO 4 in standby;

[0042] (3) Prepare the solution used for deposition: take 1g H 2 PtCl 6 The powder was diluted with 100 m...

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Abstract

The invention belongs to the field of fuel cells, and particularly relates to a preparation method and application of a self-supporting membrane electrode. The method comprises the following steps: pretreating an electrode substrate layer; preparing a hydrophilic electrode substrate layer; adopting H2PtCl6 powder, water and sulfuric acid for preparing an electro-deposition solution; and preparing a self-supporting electrode and a self-supporting membrane electrode. According to the invention, the self-supporting membrane electrode is prepared in an electro-deposition mode, operation is simple and easy, deposition is uniform, and loss of a noble metal catalyst in the traditional commercial catalyst spraying process is avoided; meanwhile, platinum particles with different morphologies are obtained by changing the lower limit potential in an electro-deposition manner, so that the dissolution and Ostwald ripening of the platinum-based catalyst are effectively avoided, and the durability of the fuel cell is improved; and the oxidation-reduction reaction performance of the catalyst can be further enhanced. The self-supporting membrane electrode prepared by the invention is applied to a high-temperature proton exchange membrane fuel cell, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a preparation method of a self-supporting membrane electrode and its use in a high-temperature proton exchange membrane fuel cell. 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, as a green and efficient energy conversion Devices, which are considered to be an important way to solve the energy crisis and environmental pollution problems, have received extensive attention in recent years. Catalyst is one of the key materials of proton exchange membrane fuel cell (PEMFC), its function is to reduce the activation energy of the reaction, promote the redox process of hydrogen and oxygen on the electrode, and increase the reaction rate. Proton exchange membrane f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004H01M8/12
CPCH01M8/1004H01M8/12Y02E60/50
Inventor 张玮琦王星辰苏华能徐谦马强
Owner JIANGSU UNIV
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