Hydrogen fuel cells are a device that can be converted into electrical energy through electrochemical reactions that can be converted into electrical energy through electrochemical reactions, providing solutions with development prospects for large -scale vehicle electrification. The advantages of fuel cells made of proton exchange membranes based on low temperature (below 100 ° C) are particularly obvious in the field of transportation, because they have less noise, high power density, and can use a small amount of hydrogen to provide long -term power for vehicles.
Although the development prospects are very good, such low -temperature fuel cells can only run normally in the environment of pure hydrogen and complex thermal management and water management systems, so it limits its use in the real world. Raising the operating temperature of fuel cells to 120 ° C to 150 ° C can help reduce such requirements, enhance the tolerance of fuel cells to hydrogen impurities, and simplify the internal cooling and water management system.
According to foreign media reports, recently, researchers at the Korea Institute of Science and Technology have designed a new type of polymer electrolyte (PEM) for fuel cells, which can be above 200 ° C to 250 ° to 250 °. C operation at high temperature. This PEM is based on a unique sub -carrier and can be used as a self -assembly network to promote proton conduction.
Researchers Seungju Lee, Jong Geun Seong and his colleagues pointed out in the papers: “Running PEM fuel cells at high temperature can simplify water management and achieve the integration of high -purity fuel treatment units. (PBI) PEM fuel cells are facing the challenges of unstable proton transmission at 160 ° C above 160 ° C. We have studied a PEM made of PBI PBI and chlorpylene (CEHP), which can be at the Gundam. Use in fuel cells of 250 ° C. “”
Researchers have found that when the temperature is higher than 200 ° C, the main proton transmission method of the PEM developed by them has changed, allowing fuel cells to run at 250 ° C. Preliminary testing shows that the fuel cells made of this film show excellent electrochemical performance. Compared with other existing fuel cells running in such high temperature environments, they have higher CO (carbon monoxide) capabilities and more Long running time.
Researchers Lee, Seong and his colleagues wrote in the papers: “During the preparation process, sea urchin -like CEHP particles form a decentralized and connected self -assembly network in the PBI matrix Its proton transmission performance above 200 ° C is better than P-PBI and traditional CEHP-PEM. The maximum power density in the environment with a temperature of 50 ° C is 2.35 watts/square centimeter, and in an environment with hydrogen/air and the temperature of 160 ° C to 240 ° C, in the process of heat circulation for 500 hours, there is almost no performance without performance. Decrease.
The research of Lee, Song and his colleagues may quickly open up new possibilities for fuel cells that are better and suitable for transportation -related applications. Although the team’s new PEM has achieved a very promising result, only after overcoming a series of technical problems can it be commercialized. The most important thing is that scientists and engineers must first determine the development of stable catalysts and adhesives that can be used at high temperatures above 250 ° C for a long time.