Method for improving running stability of fuel cell

A fuel cell and stability technology, used in fuel cells, circuits, electrical components, etc., can solve the problems of doping acid loss and performance degradation, and achieve the effect of slowing performance degradation, reducing loss and prolonging battery life.

Active Publication Date: 2019-05-21
江苏乾景新能源产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After research, it is found that the large loss of doping acid in HT-PEMFC during constant current operation is one of the main reasons for its performance degradation

Method used

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  • Method for improving running stability of fuel cell
  • Method for improving running stability of fuel cell
  • Method for improving running stability of fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of gas diffusion electrodes

[0022] The size of the prepared gas diffusion electrode is 2.3cm×2.3cm. The gas diffusion backing is Toray TGP-H-90 carbon paper. The carbon powder used in the microporous layer is VulcanXC-72R, the adhesive used is polytetrafluoroethylene (PTFE), and the contents of carbon powder and PTFE are 85wt.% and 15wt.%. The catalyst used in the catalytic layer is 45.7wt.%Pt / C (Tanaka Kikinzoku KogyoCo., Ltd.), and the Pt loading is 1.0mg cm -2 , the catalytic layer binder is PTFE, and the percentage in the catalytic layer is 30wt.%.

[0023] (2) Preparation of Membrane Electrode Assembly

[0024] The electrolyte membrane is a phosphoric acid-doped ABPBI membrane with a size of 4cm×4cm and a phosphoric acid doping amount of 370wt.%. In the membrane electrode hot-pressing mold, place two prepared identical gas diffusion electrodes on both sides of the electrolyte membrane, put the mold into a hot-pressing machine at 140°C for 5 mi...

Embodiment 2

[0028] Single cell at 0.2A·cm -2 Run at low current density for 160s, followed by 0.8A·cm -2 Run at high current density for 224 s, so that the average operating current is 0.55A cm -2 , the rest of the steps are the same as in Example 1. The discharge performance curve results are as follows figure 2 shown. Battery at 0.55A·cm -2 Under the current density, the voltage decreases by 0.09V before and after operation, and the membrane resistance increases by 0.03Ω·cm 2 .

Embodiment 3

[0030] Single cell at 0.55A·cm -2 Run 500h under the current density, and the remaining steps are the same as in Example 1. The discharge performance curve results are as follows image 3 shown. Battery at 0.55A·cm -2 Under the current density, the voltage decreases by 0.17V before and after operation, and the membrane resistance increases by 0.1 Ω cm 2 .

[0031] As can be seen from the above-mentioned Example 1, Example 2 and Example 3, the average current density is 0.55A cm -2 Under the condition of , the embodiment 2 with the longest running time at low current density has the smallest voltage drop and the smallest increase in membrane resistance after 500h, indicating that the loss of phosphoric acid is the least and the performance decay is the smallest. Therefore, the present invention adopts the method of alternately operating under high and low current densities, which can effectively slow down the performance degradation of the battery and significantly prolong...

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Abstract

The invention discloses a method for improving running stability of a fuel cell, and belongs to the technical field of fuel cells. The fuel cell alternatively runs under different high and low currents. Compared with a traditional constant-current running mode, the loss of a doping acid can be reduced on the premise that the power output capability is unchanged, the battery performance attenuationis effectively reduced, and the running lifetime of the fuel cell is remarkably prolonged.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for enhancing the operation stability of fuel cells. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy in fuel into electrical energy. It is not limited by the Carnot cycle and has a high conversion rate. With its advantages of high energy density and low pollution, it will become an ideal power source in the future. . Among them, the polymer electrolyte membrane fuel cell (PEMFC) has low operating temperature, fast start-up, high specific power, simple structure, high reliability, and truly "zero emission". preferred power generation source. However, in practical application, it faces problems such as fuel reforming and purification, difficult water and heat management, complex structure and high cost. [0003] Increasing the operating temperature is considered to be an ideal way to solve the main problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04858H01M8/124
CPCY02E60/50
Inventor 张玮琦苏华能马强朱新坚吴瞾慧
Owner 江苏乾景新能源产业技术研究院有限公司
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